This document summarizes research on optimizing the gain of an erbium-doped fiber amplifier (EDFA) based wavelength division multiplexing (WDM) system using different pumping wavelengths. The EDFA-WDM system was simulated using OptiSystem software to analyze gain flatness, noise figure, and bit error rate for 16 channels simultaneously amplified using a single EDFA stage. Pumping wavelengths of 980nm and 1480nm were compared, with 1480nm pumping achieving gain flatness of 40±0.5dB and noise figure below 6dB across all channels. Output power was found to increase with higher pump power, up to 24.557dBm at 500mW of pump power for 1480
Gain Analysis of EDF Amplifier Based WDM System Using Different Pumping Wavel...iosrjce
IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electronics and communication engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electronics and communication engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
5 Simulation of Gain flattening 32 channels EDFA-DWDM Optical SystemINFOGAIN PUBLICATION
The gain flatness of EDFA plays a very critical role in DWDM system applications in all optical network design. The main purpose of this paper is to achieve gain flatness for 32 channels in order to equalize amplitude gain of DWDM system. This system is simulated using Opti system software to achieve gain flatness of EDFA through variation of EDFA pump power and input power of system. The gains are flattened within 41±0.9 dB from Wavelength range 1546 to 1560 nm having noise figure less than 8dB, Optimized EDFA fiber length of 6.245 m and frequency spacing between channels is 0.4 nm simultaneously amplified in a EDFA of single stage. The working model consists of WDM transmitter , MUX, Pump laser, dual port WDM analyzer and EDFA as key components
An Overview of EDFA Gain Flattening by Using Hybrid AmplifierIJEEE
Data communication systems are increasingly engrossing optical fiber communication system as the transmission paths for the information, the information is in the form of light pulses sending from one place to another through the optical fiber. Several types of optical amplifiers have been developed in optical fiber communication system to amplify the optical signals. The erbium doped fiber amplifier is one of the optical fiber amplifiers which are used for long distance communication. The most significant points in any optical amplifier design are gain and noise figure. They are connected to one another. The other optical amplifier, Raman amplifier has wide gain bandwidth. The EDFA gain spectrum has variations over 1536 to 1552 nm, therefore the gain flattening is a research issue in recent years with the development of high capacity DWDM. The gain variation becomes a problem as the number of channels increases. The gain of EDFA depends on large number of device parameters such as, Erbium ion concentration, amplifier length, core radius, pump power. Raman amplifiers can be combined with EDFAs to expand the optical gain flattened bandwidth. This paper focuses on different methods used for the gain flattening.
Gain and noise figure analysis of erbium doped fiber amplifierseSAT Journals
Abstract Erbium doped fiber amplifier (EDFA) performance is dependent on several factors such as fiber length, pump power, Er3+
concentration. This paper involves the simulation of an EDFA using Optisystem and analyzes the gain and noise figure of EDFA
in the Conventional band in terms of pump power and fiber length. The gain increases initially with the pump power when the
length is fixed and then it decreases. The gain also increases with the length when pump power is fixed and decreases after
reaching a maximum. Whereas the noise figure increases with length and decreases with pump power.
Key Words: EDFA, pump power, gain, noise figure
Gain Flatness and Noise Figure Optimization of C-Band EDFA in 16-channels WDM...Yayah Zakaria
In this paper, Gain Flatness and Noise Figure of Erbium Doped Fiber Amplifier (EDFA) have been investigated in 16-channels Wavelength Division Multiplexing (WDM). Fiber Bragg Grating (FBG) is used in C-band with the aim to achieve flat EDFA output gain. The proposed model has been studied in detail to evaluate and to enhance the performance of the transmission system in terms of gain, noise figure and eye diagram of the
received signals. To that end, various design parameters have been investigated and optimized, such as frequency spacing, EDF length and temperature. To enhance the transmission system performance in terms of gain flatness, the Gain Flattening Filter (GFF) has been introduced in the design. To prove the efficiency of the new design, the optical transmission
system with optimized design parameters has been compared with a previous works in the literature. The simulation results show satisfactory performance with quasi-equalized gain for each channel of the WDM transmission system.
The scope of this paper is to analyze the performance of HG_EDFA (High Gain Erbium Doped Fiber Amplifier) and LN_EYCDFA (Less ASE Noise erbium-ytterbium co-doped fiber amplifier) using single pumping with the wavelength of 980nm by the various parameters like Gain, forward output signal power and forward and backward ASE (Amplified spontaneous Emission) noise power. This Paper describes the simulation models of HG_EDFA is connected with an input of (DMLaser1) direct modulated laser source and the performance was analyzed with the parameters were measured and the values are tabulated and plotted and compared with LN_EYCDFA. The simulation model consists of input source 1mw with wavelength (1550nm), pumping CW Laser source with wavelength 980nm and Filter. The resulting models were accurately represents Gain and optimized output signal power. Simulation results shows that by choosing careful fiber length 20m and pump power 1mw in single pumping gives ASE noise 0.0025mw in HG_EDFA and 12X10-14mw in LN_EYCDFA.
Gain Analysis of EDF Amplifier Based WDM System Using Different Pumping Wavel...iosrjce
IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electronics and communication engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electronics and communication engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
5 Simulation of Gain flattening 32 channels EDFA-DWDM Optical SystemINFOGAIN PUBLICATION
The gain flatness of EDFA plays a very critical role in DWDM system applications in all optical network design. The main purpose of this paper is to achieve gain flatness for 32 channels in order to equalize amplitude gain of DWDM system. This system is simulated using Opti system software to achieve gain flatness of EDFA through variation of EDFA pump power and input power of system. The gains are flattened within 41±0.9 dB from Wavelength range 1546 to 1560 nm having noise figure less than 8dB, Optimized EDFA fiber length of 6.245 m and frequency spacing between channels is 0.4 nm simultaneously amplified in a EDFA of single stage. The working model consists of WDM transmitter , MUX, Pump laser, dual port WDM analyzer and EDFA as key components
An Overview of EDFA Gain Flattening by Using Hybrid AmplifierIJEEE
Data communication systems are increasingly engrossing optical fiber communication system as the transmission paths for the information, the information is in the form of light pulses sending from one place to another through the optical fiber. Several types of optical amplifiers have been developed in optical fiber communication system to amplify the optical signals. The erbium doped fiber amplifier is one of the optical fiber amplifiers which are used for long distance communication. The most significant points in any optical amplifier design are gain and noise figure. They are connected to one another. The other optical amplifier, Raman amplifier has wide gain bandwidth. The EDFA gain spectrum has variations over 1536 to 1552 nm, therefore the gain flattening is a research issue in recent years with the development of high capacity DWDM. The gain variation becomes a problem as the number of channels increases. The gain of EDFA depends on large number of device parameters such as, Erbium ion concentration, amplifier length, core radius, pump power. Raman amplifiers can be combined with EDFAs to expand the optical gain flattened bandwidth. This paper focuses on different methods used for the gain flattening.
Gain and noise figure analysis of erbium doped fiber amplifierseSAT Journals
Abstract Erbium doped fiber amplifier (EDFA) performance is dependent on several factors such as fiber length, pump power, Er3+
concentration. This paper involves the simulation of an EDFA using Optisystem and analyzes the gain and noise figure of EDFA
in the Conventional band in terms of pump power and fiber length. The gain increases initially with the pump power when the
length is fixed and then it decreases. The gain also increases with the length when pump power is fixed and decreases after
reaching a maximum. Whereas the noise figure increases with length and decreases with pump power.
Key Words: EDFA, pump power, gain, noise figure
Gain Flatness and Noise Figure Optimization of C-Band EDFA in 16-channels WDM...Yayah Zakaria
In this paper, Gain Flatness and Noise Figure of Erbium Doped Fiber Amplifier (EDFA) have been investigated in 16-channels Wavelength Division Multiplexing (WDM). Fiber Bragg Grating (FBG) is used in C-band with the aim to achieve flat EDFA output gain. The proposed model has been studied in detail to evaluate and to enhance the performance of the transmission system in terms of gain, noise figure and eye diagram of the
received signals. To that end, various design parameters have been investigated and optimized, such as frequency spacing, EDF length and temperature. To enhance the transmission system performance in terms of gain flatness, the Gain Flattening Filter (GFF) has been introduced in the design. To prove the efficiency of the new design, the optical transmission
system with optimized design parameters has been compared with a previous works in the literature. The simulation results show satisfactory performance with quasi-equalized gain for each channel of the WDM transmission system.
The scope of this paper is to analyze the performance of HG_EDFA (High Gain Erbium Doped Fiber Amplifier) and LN_EYCDFA (Less ASE Noise erbium-ytterbium co-doped fiber amplifier) using single pumping with the wavelength of 980nm by the various parameters like Gain, forward output signal power and forward and backward ASE (Amplified spontaneous Emission) noise power. This Paper describes the simulation models of HG_EDFA is connected with an input of (DMLaser1) direct modulated laser source and the performance was analyzed with the parameters were measured and the values are tabulated and plotted and compared with LN_EYCDFA. The simulation model consists of input source 1mw with wavelength (1550nm), pumping CW Laser source with wavelength 980nm and Filter. The resulting models were accurately represents Gain and optimized output signal power. Simulation results shows that by choosing careful fiber length 20m and pump power 1mw in single pumping gives ASE noise 0.0025mw in HG_EDFA and 12X10-14mw in LN_EYCDFA.
Raman amplifier performance in pre-amplifier use for optical fiber communicat...TELKOMNIKA JOURNAL
The development of telecommunications networks is currently dominated by fiber optics. The fiber optic has become a waveguide medium transmitting information with high frequency bands, high capacity and high speed. An optical amplifier is required to maintain electromagnetic signals when they propagate in far distance. One of the amplifiers, Fiber Raman Amplifiers (FRA) which is the light scattering from the light that comes with the phonon in the lattice of amplification medium produces photons that are coherent with the incoming photons. Many amplifiers are commonly used but the problems not only come from the amplifier but also the component circuit and system. By simulation method, FRA circuit is designed and operated in the form of pre-amplifiers to maintain a better signal from material interference and geometry. The simulation results show that the lowest BER value and the highest Q-factor are found at a distance of 10 km depicted by eye diagram.
Optimum Location of EDFA based on Eye Diagram, Q-factor and Bit Error Rate Me...IOSRJECE
This work investigated the optimum location of Erbium Doped Fiber Amplifier (EDFA) in an optical system based on analysis of BER analyzer metrics by simulation approach using Optisystem software. The simulation model will be studied based on many parameters as input power (dBm), gain of Amplifier (dBm), fiber cable length (km) and attenuation coefficient (dB/km), there are two different parameters will be analyzed at five different locations of EDFA which are Q-Factor and Bit Error Rate (BER) and also Eye Diagram, which Q-factor and BER are measurement parameters used to measure the quality of received signal at receiver.
A multi-wavelength fiber laser which is based on a Lyot filter is experimentally demonstrated. A combination of four-wave mixing in a highly nonlinear fiber and Lyot filter mechanism in the laser cavity is able to generate multi-wavelength with relatively high extinction ratio (ER). At the input current of 100mA, six laser lines with ER more than 5 dB are successfully generated. The wavelength spacing for the multi-wavelength is 0.15nm, corresponding to the characteristics of the Lyot filter used.
Optical power debugging in dwdm system having fixed gain amplifierseSAT Journals
Abstract
This article covers optical power measurement of light signal in DWDM network and debugging of optical power as per the specifications of DWDM system with fix gain amplifier. The measurement and calculations of each component of DWDM system is discussed individually. Optical power of individual optical channel, aggregate optical power of multiplexed signals, relation with amplifier gain, insertion loss and attenuation on signal are the key factors involved in design and operation of DWDM system. From transmitter to receiver, the working performance of the DWDM system depends on the optical strength of input light signal should be as per specifications of its components. A description of input and output optical power of light signal of each DWDM component and its relationship is discussed. If there is any deviation as per specifications is observed, process to calculate deviation and debug is given with working example in this article.
Keywords: Dense wavelength division multiplexing (DWDM), Optical MUX/DEMUX, Optical transmitters/receivers, Optical amplifiers, Optical Fiber, Optical power, Attenuation, Optical Power Debugging
Performance Analysis of Optical Amplifiers (EDFA and SOA)IOSRJECE
In the optical transmission systems attenuation causes signal power to drop through an optical fiber link, so need to use amplifiers to increase signal power with low noise. Semiconductor Optical Amplifier (SOA) and Erbium-Doped Fiber Amplifier (EDFA) are two of the main types of optical amplifiers, and they were used in this simulation model to analyze their performance, with a data rate of 622 Mb/s (STM-4 level) and 170 km optical fiber length for each simulation model. This was simulated by using OptiSystem simulator, including the main parameters of the optical transmission system as input power (dBm), optical fiber cable length (km) and attenuation per length of optical fiber cable (dB/km), also there are three parameters will be considered which they are output power (dBm), Q-Factor and Bit Error Rate (BER) at receiver, and also Eye Diagram.
Performance Evaluation and Simulation of OFDM in Optical Communication SystemsIJERA Editor
Orthogonal Frequency Division Multiplexing (OFDM) is of prime importance nowadays in long haul
communication networks because of its higher spectral efficiency, immunity to multipath fading and its
resilience to interference. Optical Orthogonal Frequency Division Multiplexing is considered as a promising
technology to satisfy the increased demand for bandwidth in broadband services. It is of two types based on the
detection techniques employed. They are direct detection and coherent detection. In direct detection OFDM, a
photodiode is used while in the latter the principle of optical mixing is utilized. This paper investigates the
architecture of single channel and four channel direct detection and coherent detection optical OFDM systems
and carries out performance analysis based on bit error rate and Q-factor. In the case of single channels, a date
rate of 10 Gbps is achieved while in 4 channel systems a data rate of 40 Gbps is achieved. Coherent Optical
OFDM (CO-OFDM) is the next generation technology for the optical communications, since it integrates the
advantages of both coherent systems and OFDM systems.
Power Transient Response of EDFA as a function of Wavelength in the scenario ...ijsrd.com
In this paper power transient is investigated as function of add/drop wavelength and surviving channel wavelength. We have reported that power excursions varies with different wavelength allocations of the add/drop channels. Transient response is reduced by 73.39% in case when add/drop channels are taken in L band instead of C band. Also power transient response is calculated as a function of wavelengths of surviving channel. It has been observed that at higher wavelengths power excursions are less than at shorter wavelengths of C band.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
COMPARISON BETWEEN ENERGY EFFICIENT COOPERATIVE MIMO AND COOPERATIVE RELAY IN...jantjournal
Wireless sensor network consists of thousand number of sensor nodes employed in a wide range of data gathering application such as environmental gathering, military applications etc. Each sensor node in WS N are powered by battery having limited energy so it is very difficult to replace there batteries for
prolonged the network life time. Maximizing the network lifetime have been most important design goal for the network. In WSN channel fading and radio interference constitute a big dispute in design of energy efficient communication protocol. To reduce fading and energy consumption in WSN, MIMO MISO SISO
scheme is employed but implement multiple antenna technology to sensor network is improbable because of the sensor node generally support a single antenna. Cooperative scheme are utilized in WSN by applying the collective nature of the sensor nodes to provide reliable communication links in order to lower the total energy consumption. In this paper, the cooperative technique are inspected and by comparing different
cooperative techniques we can elect the best cooperative scheme for energy constrained WS N application.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Raman amplifier performance in pre-amplifier use for optical fiber communicat...TELKOMNIKA JOURNAL
The development of telecommunications networks is currently dominated by fiber optics. The fiber optic has become a waveguide medium transmitting information with high frequency bands, high capacity and high speed. An optical amplifier is required to maintain electromagnetic signals when they propagate in far distance. One of the amplifiers, Fiber Raman Amplifiers (FRA) which is the light scattering from the light that comes with the phonon in the lattice of amplification medium produces photons that are coherent with the incoming photons. Many amplifiers are commonly used but the problems not only come from the amplifier but also the component circuit and system. By simulation method, FRA circuit is designed and operated in the form of pre-amplifiers to maintain a better signal from material interference and geometry. The simulation results show that the lowest BER value and the highest Q-factor are found at a distance of 10 km depicted by eye diagram.
Optimum Location of EDFA based on Eye Diagram, Q-factor and Bit Error Rate Me...IOSRJECE
This work investigated the optimum location of Erbium Doped Fiber Amplifier (EDFA) in an optical system based on analysis of BER analyzer metrics by simulation approach using Optisystem software. The simulation model will be studied based on many parameters as input power (dBm), gain of Amplifier (dBm), fiber cable length (km) and attenuation coefficient (dB/km), there are two different parameters will be analyzed at five different locations of EDFA which are Q-Factor and Bit Error Rate (BER) and also Eye Diagram, which Q-factor and BER are measurement parameters used to measure the quality of received signal at receiver.
A multi-wavelength fiber laser which is based on a Lyot filter is experimentally demonstrated. A combination of four-wave mixing in a highly nonlinear fiber and Lyot filter mechanism in the laser cavity is able to generate multi-wavelength with relatively high extinction ratio (ER). At the input current of 100mA, six laser lines with ER more than 5 dB are successfully generated. The wavelength spacing for the multi-wavelength is 0.15nm, corresponding to the characteristics of the Lyot filter used.
Optical power debugging in dwdm system having fixed gain amplifierseSAT Journals
Abstract
This article covers optical power measurement of light signal in DWDM network and debugging of optical power as per the specifications of DWDM system with fix gain amplifier. The measurement and calculations of each component of DWDM system is discussed individually. Optical power of individual optical channel, aggregate optical power of multiplexed signals, relation with amplifier gain, insertion loss and attenuation on signal are the key factors involved in design and operation of DWDM system. From transmitter to receiver, the working performance of the DWDM system depends on the optical strength of input light signal should be as per specifications of its components. A description of input and output optical power of light signal of each DWDM component and its relationship is discussed. If there is any deviation as per specifications is observed, process to calculate deviation and debug is given with working example in this article.
Keywords: Dense wavelength division multiplexing (DWDM), Optical MUX/DEMUX, Optical transmitters/receivers, Optical amplifiers, Optical Fiber, Optical power, Attenuation, Optical Power Debugging
Performance Analysis of Optical Amplifiers (EDFA and SOA)IOSRJECE
In the optical transmission systems attenuation causes signal power to drop through an optical fiber link, so need to use amplifiers to increase signal power with low noise. Semiconductor Optical Amplifier (SOA) and Erbium-Doped Fiber Amplifier (EDFA) are two of the main types of optical amplifiers, and they were used in this simulation model to analyze their performance, with a data rate of 622 Mb/s (STM-4 level) and 170 km optical fiber length for each simulation model. This was simulated by using OptiSystem simulator, including the main parameters of the optical transmission system as input power (dBm), optical fiber cable length (km) and attenuation per length of optical fiber cable (dB/km), also there are three parameters will be considered which they are output power (dBm), Q-Factor and Bit Error Rate (BER) at receiver, and also Eye Diagram.
Performance Evaluation and Simulation of OFDM in Optical Communication SystemsIJERA Editor
Orthogonal Frequency Division Multiplexing (OFDM) is of prime importance nowadays in long haul
communication networks because of its higher spectral efficiency, immunity to multipath fading and its
resilience to interference. Optical Orthogonal Frequency Division Multiplexing is considered as a promising
technology to satisfy the increased demand for bandwidth in broadband services. It is of two types based on the
detection techniques employed. They are direct detection and coherent detection. In direct detection OFDM, a
photodiode is used while in the latter the principle of optical mixing is utilized. This paper investigates the
architecture of single channel and four channel direct detection and coherent detection optical OFDM systems
and carries out performance analysis based on bit error rate and Q-factor. In the case of single channels, a date
rate of 10 Gbps is achieved while in 4 channel systems a data rate of 40 Gbps is achieved. Coherent Optical
OFDM (CO-OFDM) is the next generation technology for the optical communications, since it integrates the
advantages of both coherent systems and OFDM systems.
Power Transient Response of EDFA as a function of Wavelength in the scenario ...ijsrd.com
In this paper power transient is investigated as function of add/drop wavelength and surviving channel wavelength. We have reported that power excursions varies with different wavelength allocations of the add/drop channels. Transient response is reduced by 73.39% in case when add/drop channels are taken in L band instead of C band. Also power transient response is calculated as a function of wavelengths of surviving channel. It has been observed that at higher wavelengths power excursions are less than at shorter wavelengths of C band.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
COMPARISON BETWEEN ENERGY EFFICIENT COOPERATIVE MIMO AND COOPERATIVE RELAY IN...jantjournal
Wireless sensor network consists of thousand number of sensor nodes employed in a wide range of data gathering application such as environmental gathering, military applications etc. Each sensor node in WS N are powered by battery having limited energy so it is very difficult to replace there batteries for
prolonged the network life time. Maximizing the network lifetime have been most important design goal for the network. In WSN channel fading and radio interference constitute a big dispute in design of energy efficient communication protocol. To reduce fading and energy consumption in WSN, MIMO MISO SISO
scheme is employed but implement multiple antenna technology to sensor network is improbable because of the sensor node generally support a single antenna. Cooperative scheme are utilized in WSN by applying the collective nature of the sensor nodes to provide reliable communication links in order to lower the total energy consumption. In this paper, the cooperative technique are inspected and by comparing different
cooperative techniques we can elect the best cooperative scheme for energy constrained WS N application.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Gain Flatness and Noise Figure Optimization of C-Band EDFAin 16-channels WDM ...IJECEIAES
In this paper, Gain Flatness and Noise Figure of Erbium Doped Fiber Amplifier (EDFA) have been investigated in 16-channels Wavelength Division Multiplexing (WDM). Fiber Bragg Grating (FBG) is used in C-band with the aim to achieve flat EDFA output gain. The proposed model has been studied in detail to evaluate and to enhance the performance of the transmission system in terms of gain, noise figure and eye diagram of the received signals. To that end, various design parameters have been investigated and optimized, such as frequency spacing, EDF length and temperature. To enhance the transmission system performance in terms of gain flatness, the Gain Flattening Filter (GFF) has been introduced in the design. To prove the efficiency of the new design, the optical transmission system with optimized design parameters has been compared with a previous works in the literature. The simulation results show satisfactory performance with quasi-equalized gain for each channel of the WDM transmission system.
Optimum Location of EDFA based on Eye Diagram, Q-factor and Bit Error Rate Me...IOSRJECE
This work investigated the optimum location of Erbium Doped Fiber Amplifier (EDFA) in an optical system based on analysis of BER analyzer metrics by simulation approach using Optisystem software. The simulation model will be studied based on many parameters as input power (dBm), gain of Amplifier (dBm), fiber cable length (km) and attenuation coefficient (dB/km), there are two different parameters will be analyzed at five different locations of EDFA which are Q-Factor and Bit Error Rate (BER) and also Eye Diagram, which Q-factor and BER are measurement parameters used to measure the quality of received signal at receiver.
PERFORMANCE ANALYSIS OF ULTRAWIDEBAND WDM-ROF TECHNIQUEIAEME Publication
The demand for high capacity and wideband telecommunication channels for longdistance communication increases exponentially. The standard C and L bands have limited bandwidth and capacity. That promotes intensive research and development in wideband wavelength division multiplexing, intending to achieve low BER and highquality factors. We used four channels from various bands in the proposed wideband WDM method: O (1355 nm), E (1427 nm), L (1595 nm), and U (1595 nm) (1665 nm). We adjusted the laser intensity from -10 to 10 dBm and the optical fiber length from 20 to 80 km for the wideband WDM performance analysis. Raman preamplifiers and FBG have been incorporated into the receiver to improve the quality factor and BER of the received signal. This study established 40 Gbps data transmission over a unique ultrawideband of 310 nm. The Q factor and BER for the four channels are 7.345; 19.949; 7.831; 5.486 and 1.006e-13; 7.281e-89; 2.395e-15; 2.038e-08 at a laser power of -5 dBm/80km, respectively. The proposed technique is simulated and analyzed using optical simulation software Optisystem 13.
Comparative performance of optical amplifiers: Raman and EDFATELKOMNIKA JOURNAL
The in-line optical signal amplification is often used in optical communication systems to accomplish longer transmission distances and larger capacity. In this proposed paper, the operation of two types of optical amplifiers for 16×10 Gbps wavelength division multiplexing system had been examined by changing transmission distance from 10 to 200 km with a dispersion equals to 16.75 ps/nm/km. The analysis and design of such systems ordinarily includes many signal channels, nonlinear devices, several topologies with many noise sources, is extremely complex and effort-exhaustive. Therefore, theoretical studies with simulation CAD software of systems are become necessity to predict and optimize system performance. The comparison between EDFA and Raman has already explored by many researchers in varying ways in this work and to achieve obove objectives, the OptiSystem software was used to design the proposed fiber optic communications system and to simulate results. Performance for the present system was evaluated for parameters like bit error rate (BER), quality factor (QF), total gain with eye opening factor. It was saw that EDFA provides better results, in the maximal transmission distance 64% better than Raman amplifier, 57.5% for amplification gain and 26.7% for maximum quality factor. As a future study a hybrid amplifier can produce better quality of amplification.
Reduction of Four-Wave Mixing in DWDM System using Electro-Optic Phase Modula...IJECEIAES
In this paper, electro-optic phase modulator (EOPM) is used to reduce the effect of four-wave mixing (FWM), which is placed after 64 DWDMchannels multiplexer. It was found that the FWM is very sensitive to the phase deviation of the EOPM, and it can be reduced by introducing a phase shift between pulses. The simulation results confirmed the ability of the EOPM in improving the system performanceas indicated by the bit error rates. In term of comparison, the system of 64 channels based intensity modulated/ direct detection (IM/DD) transmission achieved bit error rate of 10 over 30 km and 70km without and with EOPM, respectively. -26
High speed pulse generators with electro-optic modulators based on different ...nooriasukmaningtyas
The paper outlines the simulation of various pulse generators for the
enhancement of optical fiber access transmission networks within flow rate
of 10 Gbps and transmission range of 100 km. The pulse generators are
gaussian, hyperbolic secant, triangle, sine, raised cosine in the transmission
stage. Proposed pulse generators are mixed with both electro-absorption
modulator (EAM) and Mach-Zehnder modulator (MZM) for efficient
transmission. We have compared the max. the quality factor with using
proposed pulse generators against nonreturn to zero (NRZ) return to zero
(RZ) pulse generators in the previous research works for different bit
sequences. The signal power amplitude is tested for both optical fiber and
PIN photodetector optical time-domain visualizer and RF spectrum analyzer
by using in the optimum cases for different bit sequence. It is observed that
proposed pulse generators/EAM have presented an efficient increase in Qfactor value compared with proposed pulse enerators/MZM for different bit sequences.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
analysis on design and implementation of 4×10 gb s wdm tdm pon with disparate...INFOGAIN PUBLICATION
This article presents a design of wavelength division multiplexing/ Time division Multiplexing (WDM-TDM) in passive optical network with a data rate of 10 Gbps. The implementation has been carried out for varying link distance from 40km to 100km for 4 different wavelengths with a maximum of 32 supporting users with two different receiver photodiodes. The parameters such as BER and the Q-factor for PON network is being analyzed with the link distance. The BER is decreased as the distance of the network is increased when using the APD receivers than PIN receiver. Optimal value of BER is obtained for a distance of 97 Km in APD and 96 Km in pin receiver.
MIMO-OFDM (Multi Input Multi Output- Orthogonal Frequency Division Multiplexing) system is very popular technique for mobile communication. We found that Ergodic channel capacity has some limitation in MIMO-OFDM system. So Ergodic channel capacity optimization is necessary to improve the performance of MIMO-OFDM System.
3 ijaems jan-2016-9-gain flattening of wdm network for the c+l band using hyb...INFOGAIN PUBLICATION
In this paper the hybrid combination of Erbium doped fiber amplifier (EDFA) and Raman amplifier are projected for wavelength division multiplexed system. Gain flatness achieved for C+L Band through hybrid amplifier is more than EDFA with Gain flattening filter. The hybrid optical amplifier has maximum gain of 25.6259dB, gain flatness of 3.17dB and noise figure less than 6dB at input power -20dBm of each channel
In pursuit of high transmission capacity, people have been tried many ways. For
example, they pave more cables or use the TDM (time domain multiplexer) to
improve the transmission capacity. But in these traditional ways, signals could
become weaker in power through the fiber link. And the further they are transmitted,
the weaker the signals will be until they can not be detected. With the advanced of
technology, optical amplifier which is a better solution to improve the transmission
capacity came around. It can strengthen the attenuated signals and even can bring
them back to the original level. And now it is mainly applied in DWDM technology
so that DWDM technology can support long-haul transmission.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
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P01062114120
1. IOSR Journal of Electronics and Communication Engineering (IOSR-JECE)
e-ISSN: 2278-2834,p- ISSN: 2278-8735.Volume 10, Issue 6, Ver. II (Nov - Dec .2015), PP 114-120
www.iosrjournals.org
DOI: 10.9790/2834-1062114120 www.iosrjournals.org 114 | Page
Gain Analysis of EDF Amplifier Based WDM System Using
Different PumpingWavelength
Vishal Srivastava1
, Munish Singh2
1
M-Tech Student ECE, Lovely Professional University, Punjab, India 2
Assistant Professor, ECE, Lovely
Professional University, India
Abstract: This report describes the simulation model of Erbium doped fiber amplifier (EDFA) with different
pump power (250mw,300mw,up to 500mw) with optimized gain and maintained noise figure is obtained by
using single pumping (backward pumping) with the wavelength 980nm and 1480nm pumping wavelength and
the results are plotted with various fiber length and pump power. The performance of the EDFA based WDM
system has been evaluated in terms of different parameter such as gain, gain flatness, and noise figure. The
system has a wide variety of research in next generation networks. The EDFA optical amplifier system is
require less input power so such systems are easy to evaluate and provide high gain and less noise figure. Many
factors i.e. gain flatness, noise figure and bit error rate (BER) may influence the performance of such systems.
In this research, the gain is being optimized in terms of different fiber length and pump power. The system is
simulated on Opti- system software to analyze the gain flatness bit error rate and noise figure of EDFA through
optimized fiber length and pump power. The gain is flattened within 39±0.25dB and noise figure<5dB for 16
channels from 1546nm to 1558nm range of wavelength with the channel spacing of 0.8nm are simultaneously
operating with the single stage EDFA with a constant input power -26dB.
Keywords: EDFA, gain flatness, fiber length, pump power, WDM, single pumping,pumping wavelength.
I. Introduction
Optical Amplifier is a device that amplifies an optical signal (as input signal) directly in optical form
without the need of first convert it into an electrical signal. There are so many optical amplifier are used in
telecommunication but here we do the gain analysis of Erbium-doped fiber amplifier (EDFA) using WDM
system. Now a days, Internet services requires large bandwidth, so EDFA’s are used in WDM Technology
which increases the optical network capacity without affecting the cost. Wavelength-division multiplexing
(WDM) is the kind of the multiplexer that is intended to use multiple number of sources that are bound to
operate at different wavelengths for transmission of several independent information streams over the same fiber
in simultaneous manner. The fiber transmission capacity is further enhanced using WDM. In WDM system the
wavelengths over C-band and L-band are amplified to require power level where the amplification of the
particular channel depends on [1] :
Signal wavelength
Number of signal present in system
Input signal power
Since the WDM device need to operate at electronic speed commonly, it is easier to implement any
WDM devices.
II. System Description
Erbium Doped Fiber Amplifier (EDFA) is a Optical Amplifier that uses a fiber which has been lightly
doped with rare earth ion (i.e.erbium). It is uses this doped optical fiber as a gain medium to amplify an optical
signal. The signal to be amplified and a pump laser are multiplexed into a doped fiber and the signal is amplified
through interaction with doping ions.The EDFA having limited range (10m to 30m) [2]. The operation of
standard EDFA normally is limited to 1530 to 1560 nm region, this region is known as C-band (Conventional
band). For simultaneous amplification of various data channel having different wavelengths in different gain
regions a single EDFA is used. Before the development of such fiber amplifiers there was no such practical
method available for the process of amplification of the channels between long fiber spans of fiber optics link
[3].Several methods used for the purpose of designing flat spectral gain EDFA are :
2. Gain Analysis of EDFAmplifier Based WDM System Using Different PumpingWavelength
DOI: 10.9790/2834-1062114120 www.iosrjournals.org 115 | Page
By controlling doped fiber length, pump power and choosing proper optical notch for filters characteristics.
By employing homogenous broadened gain medium
By using acousto-optic tunable fiber
Fig. 1.1: Basic block diagram of an EDFA
EDFA-WDM system stimulated using Opti-system software to achieve the gain flatness of EDFA
through optimized fiber length and pump power. The gains are flattened within 39±0.5 dB from 1546nm to
1558nm band of wavelength with noise figure (NF)<6dB for 16-channels simultaneous amplification in a single
stage EDFA with channel spacing 0.8nm. The gain is optimized using a single pumping with the wavelength
980nm. The 980nm pumping yields a complete population inversion (maximum gain) at shorter amplifier
lengths than 1480nm pumping. This leads to a lower amplifiers noise figure when using 980 nm pumping [4][5].
III. Motivation Of Research Work
In analyzing and designing optical network there are several methods can be used. For this EDFA
(Erbium doped fiber amplifier) gain optimization for WDM (Wavelength Division Multiplexer) system optical
network, used simulation approach rather than fabrication methods. Simulator allows engineers to design the
most correct and efficient design before the actual optical network constructed. Moreover, able to explore the
merits of other design without physically build it. Besides, by using simulation method engineers able to study
problem that occur during designing the optical network. Before starts to design, need to identify the best
simulators software that is suitable to design this optical network. After comparing advantages and
disadvantages between Opti- system and MATLAB, Opti-system software was selected to be used in designing
EDFA in WDM system. Opti- system is a comprehensive simulation package developed by Opti-wave[6]. This
software enables users to plan, test, and simulate optical links in the transmission layer of modern optical
networks. A robust graphical user interface controls the optical component layout, component models and
presentation graphics. An extensive library of active and passive components includes realistic, wavelength-
dependent parameters. Parameters sweeps allow us to investigate the effect of particular device specifications on
systemperformance [7][8].
The applied methodology is based on Backward Single Pumping approach. Each block in the
architecture was added in the model and tested and later those blocks were assembled and were added to
compose.
IV. Research Methodology
A relatively high-powered beam of light is mixed with the input signal using a wavelength selective
coupler. The input signal and the excitation light must be at significantly different wavelengths [9]. The mixed
light is guided into a section of fiber with erbium ions included in the core. This high-powered light beam
excites the erbium ions to their higher-energy state. When the photons belonging to the signal at a different
wavelength from the pump light meet the excited erbium atoms, the erbium atoms give up some of their energy
to the signal and return to their lower-energy state[10].
3. Gain Analysis of EDFAmplifier Based WDM System Using Different PumpingWavelength
DOI: 10.9790/2834-1062114120 www.iosrjournals.org 116 | Page
Fig. 1.2 Flowchart of EDFA amplifying process
V. Proposed Work And Result
In analyzing and designing optical network there are several methods can be used. For this EDFA
(Erbium doped fiber amplifier) gain optimization for WDM (Wavelength Division Multiplexer) system optical
network, used simulation approach rather than fabrication methods. Simulator allows engineers to design the
most correct and efficient design before the actual optical network constructed. Moreover [11], able to explore
the merits of other design without physically build it. Besides, by using simulation method engineers are able to
study problem that occur during designing the optical network .The pump power is taken in a range of 250mw-
500mw while the fiber length is bound between 2 to 22m. In other hand, the 16 input channels with a spacing of
0.8nm from 1546nm to 1558nm were simultaneously operated on a single fiber with a constant input power i.e.
26dBm. The reference pup power is set to be 120mw. After that it is measured at different pump power such as
250mw,300mw etc, with an increment of 50mw up to 500mw [12]. The pumping wavelength is 980nm. the
reference power is set to 120mw for the measurement of different fiber length to find the optimized length of
fiber for amplifier used in this system as show in table1.A suitable length of fiber is 8m is chosen as an optimum
length for this system because at 8m the output power gave the maximum value at the reference power.
Therefore, the gain and noise figure are measured at 8m length with different pump power as shown in Fig 1.3
[13].
4. Gain Analysis of EDFAmplifier Based WDM System Using Different PumpingWavelength
DOI: 10.9790/2834-1062114120 www.iosrjournals.org 117 | Page
Fig1.3 Variation of output power along the fiber length for different pump powers at a constant input power
Further all the result and table of proposed work is shown below.
Table 1.1 Transmitted and received power with different pump power
Table 1.2: Gain and noise figure with respect to 16 input channels with 1480nm pumping
It is clear from above table the o/p power is increased with increase in pump power. As the signal
power increases, it start to compete with the clamping laser for the inverted population, diminishing the
Pump power (mw) i/p power (E-3)W O/p power (E-3)W DBm
250 21.959 168.391 21.938
300 21.959 195.521 22.647
350 21.959 227.727 23.235
400 21.959 254.099 23.783
450 21.959 277.724 24.172
500 21.959 306.653 25.557
5. Gain Analysis of EDFAmplifier Based WDM System Using Different PumpingWavelength
DOI: 10.9790/2834-1062114120 www.iosrjournals.org 118 | Page
degradation caused by clamping process. However, as the signal power is continuously growing there will not
be enough inverted population to keep the amplification processes, leading to larger noise figure values.Table
1.2 shows that the gain and noise figure of 16-channels simultaneously fabricated on a same fiber fort
amplification with different pumping wavelength. In case of 980nm the gain flatness 38±0.5 and the noise figure
is less than 9db with a maximum output power is 24.432dBm at the pump power of 500mw. While on other
hand, if we use the pumping wavelength 1480nm than the gain is increase and the noise figure is reduced. In
1480nm, the gain flatness is of 40±0.5 and the noise figure is less than 6dB with a maximum output power is
24.557dBm at the pump power of 500mw.
Fig. 1.4: Gain and NF variation of -26dBm/ch amplification for different pump powers
Figure1.4 shows the gain and noise figure variation of the 16-channels with a input power of -26dBm
amplification for different pump power. In here we use the pumping wavelength as 1480nm instead of 980nm.
Figure 1.5 shows the dependency of the output power on pump power, as we increases the pump power the
output power is increases. In case of 980nm pumping wavelength the output power is less as compared to
1480nm.
Figure 1.5: output power vs pump power with different pumpingwavelength
6. Gain Analysis of EDFAmplifier Based WDM System Using Different PumpingWavelength
DOI: 10.9790/2834-1062114120 www.iosrjournals.org 119 | Page
Figure 1.6: Gain and NF variation of -26dBm/ch amplification for different pump powers with different
pumping wavelength
Figure 1.6 shows that the gain and noise figure of 16-channels simultaneously fabricated on a same
fiber fort amplification with different pumping wavelength. In case of 980nm the gain flatness 38±0.5 and the
noise figure is less than 9db with a maximum output power is 24.432dBm at the pump power of 500mw.
Figure 1.7: Eye diagram from channel 1 and channel 2
Figure 1.7 describes the comparison between Eye diagram from the journal and the simulation results.
The Eye diagram shown here, gives us the bigger opening that refers that it has lower inter symbol interference
(ISI) while the width of opening indicates the time for which sampling is perform for the purpose of detection.
Here, optimal sampling time corresponds to maximum Eye opening yielding greatest protection againstnoise.
VI. Conclusion
In EDFA, each stage’s pump power and mid-stage attenuation are controlled according to the power
variation of the input signal channel channels and the optical supervisory channel, respectively. The different
pump power can affect the output power base on their length of fiber. As the pump power increases, the gain
flatness became worst which lead to more noise and bit-error-rate (BER). By choosing proper fiber length and
injected pump power to EDFA, the population inversion can be controlled. The output power is directly
proportional to pump power. Hence the increase in output power leads to increase in pump power. The optimum
fiber length is 8m. The system for 16-channel’s amplification is designed with the values of Gain flatness
40±0.5 within the bandwidth of 1546nm to 1558nm.the output power of the designed model is 24.557 dBm
along with a average noise figure <5dB at pump power of 500mw.