Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014
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Design and Perform...
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transmitted over t...
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dispersion compens...
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with resulting squ...
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‫܄‬ሺ‫܂‬ሻ = ሺ‫ۯ‬‫		...
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(a) (b) (c) (d) (e...
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Figure4. Quality f...
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Figure6: Quality f...
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Figure8: Quality f...
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Figure10: Jitter v...
Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014
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The simulated resu...
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Figure16: BER vs. ...
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Acknowledgement
Th...
Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014
[28] Kawal Preet Sing...
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Design and Performance Study of MMDWDM Systems

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The rising need for bandwidth created innumerable efforts from academic and industry group towards development of most efficient optical communication networks. In order to compete it numerous investigators have designed their own novel schemes. In this view the paper presents multiple modulation dense wavelength division multiplexed transmission designed links each with a total capacity of 640Gbps and with channel to channel to spacing of 100Ghz, employing multiple modulation schemes such as non return to zero rectangular, non return to zero raised cosine, return to zero rectangular, non return to zero raised cosine, return to zero soliton, return to zero Super Gaussian. The optical transmission performance characteristics like bit error rate, Q parameter at the output have been investigated by simulating different systems for a fixed transmission length of 260kilometers. Results show that transmission performance of DWDM system with non return to zero raised cosine scheme has been better with quality factor ranging from 16 to 23dB and bit error rate ranging from 10-11 to 10-40 for detected channels at selected transmission reach (260KM) and other schemes with good performance were RZ Super Guassian DWDM and RZ Soliton DWDM systems for the same transmission reach. The transmission parameter jitter have been also investigated for each system which depict that jitter effect is more severe for return to zero systems as compared to non return to zero DWDM systems. From the performance analysis for different optical links involving different modulation schemes it can be articulated that novel modulation scheme generally improves the transmission performance and must for modern optical communication systems operating at high bit rate and longer reach.

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  1. 1. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 11 Design and Performance Study of MMDWDM Systems Devendra Kr,Tripathi, Pallavi Singh, N.K.Shukla and H.K.Dixit Department of Electronics &Communication, J.K.Institute of Applied Physics &Technology, University of Allahabad Allahabad, U.P, India Abstract-The rising need for bandwidth created innumerable efforts from academic and industry group towards development of most efficient optical communication networks. In order to compete it numerous investigators have designed their own novel schemes. In this view the paper presents multiple modulation dense wavelength division multiplexed transmission designed links each with a total capacity of 640Gbps and with channel to channel to spacing of 100Ghz, employing multiple modulation schemes such as non return to zero rectangular, non return to zero raised cosine, return to zero rectangular, non return to zero raised cosine, return to zero soliton, return to zero Super Gaussian. The optical transmission performance characteristics like bit error rate, Q parameter at the output have been investigated by simulating different systems for a fixed transmission length of 260kilometers. Results show that transmission performance of DWDM system with non return to zero raised cosine scheme has been better with quality factor ranging from 16 to 23dB and bit error rate ranging from 10-11 to 10-40 for detected channels at selected transmission reach (260KM) and other schemes with good performance were RZ Super Guassian DWDM and RZ Soliton DWDM systems for the same transmission reach. The transmission parameter jitter have been also investigated for each system which depict that jitter effect is more severe for return to zero systems as compared to non return to zero DWDM systems. From the performance analysis for different optical links involving different modulation schemes it can be articulated that novel modulation scheme generally improves the transmission performance and must for modern optical communication systems operating at high bit rate and longer reach. Key words: Time division multiplexing (TDM), code division multiplexing (CDM), fiber optic communication (FOC), orthogonal frequency division multiplexing (OFDM) 1. Introduction Communication is the basic need of people since primordial days. People adopted numerous ways of information sharing altogether. Together with development of human civilization from time to time several eras of communication have been surpassed. The present era is of telecommunication revolution and fiber-optic transmission is one of the most trustworthy schemes which have got concentration due to development of fiber optic communication supporting devices. Now a day’s fiber optic communication (FOC) is most customary and employed over worldwide for national, intercontinental information and data transportation purposes. However with innovation of the World Wide Web there is swift increase in multimedia services and the information traffic have grown up exponentially. Thus it immediately provokes requirement for additional capacity data networks[1].For that several capacity enhancing schemes have been devised involving deployment of multichannel systems such as time division multiplexing(TDM), code division multiplexing(CDM), frequency division multiplexing(FDM),sub carrier multiplexing(SCM), orthogonal frequency division multiplexing(OFDM)and wavelength division multiplexing(WDM).WDM is the method which employs multiple optical carriers at different wavelengths that were modulated by means of independent electrical bit streams and after that
  2. 2. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 12 transmitted over the same fiber with capability of exploiting the huge bandwidth obtainable by optical fibers. Introduction of WDM has created revolution in light wave system designing community.WDM devices were simpler to put into operation as all components in WDM devices were required to function only at electronic speed. As a consequence numerous WDM devices were devised, accessible in the marketplace since past time and at present, still in growing stage. Although significant works were around 1980’s with narrowly spaced channels and a channel spacing of less than 0.1nm were illustrated by 1990 with multichannel systems and throughout the decade of 1990s WDM systems grown up swiftly[1-12]. The novel designed 10Gb/s binary NRZ systems with electronic-signal-processing show that up to 1.6bits/sec/Hz of spectral efficiency were obtainable, an improved efficiency[13].For two channel WDM system at bit rate 10Gb/s study exhibited that spectral characteristics were highly dependent on channel spacing and dispersion coefficient and cross phase modulation dependent on the optical powers of the injected signals in a very large range of system parameter [14].Study for 340Gb/s capacity link, illustrated by transmitting seventeen channels and each channel operating at 20Gb/s over150km successfully[15].Novel designed three WDM systems transmission performance were investigated for dispersion values, show that system were affected by dispersion and non-linear effects. Presently the long-haul communication systems employ multiple carrier wavelengths and higher data rates which created higher channel capacity. As spectral efficiency is one of the most important parameter for optical systems, have to be achieved in the investigations. Due to high data rates the limitation imposed by dispersion and nonlinearities in the optical communication system has been of great concern as parameters such as quality factor (Q), Jitter, BER and optical modulation selected limits the overall efficiency of the system. The performance study with chirped RZ and NRZ formats showed, improved transmission performance [16-17].Further study with non-return to zero (NRZ) and RZ modulation format show that with increased data rates RZmodulation formats present benefits over NRZ since higher robustness against distortions [18-20]. Study in eight channel WDM at 10Gb/s with NRZ/RZ/ Duo-binary signal formats for distances (5Km to 100Km) for Quality factor(Q) and Jitter show that NRZ is good modulation format in the intensity modulated direct detection fiber-optical communication systems. As NRZ pulses are with narrow optical spectrum and reduced spectrum width improves the dispersion tolerance however inter symbol interference (ISI) is present. While a part of the bit slot is occupied with RZ pulse and a broad spectrum as RZ pulse shape allows an enhanced robustness to fiber non linear effects as well as to the cause of polarization mode dispersion[21-22].Later on study with non binary encode technique such as multilevel intensity or phase modulation systems ultimate spectral efficiency showed for various modulation formats (NRZ/RZ/RZ-SuperGaussian) at data rates 10/15/20/25Gb/s and impact of EDFA power were investigated showed that smaller width,3rd to 5th order super Gaussian pulse, full width at half maximum (FWHM) 10ps to 60ps, with raised cosine filter, post and symmetric scheme showed better transmission performance. With single channel 100Gb/s transmission investigation with ASK/PSK/RZ-DQPSK, exhibited BER of 10-10 without FEC at 1920km of transmission [23-25]. Later study for three WDM systems (RZ/NRZ/CSRZ/Duo binary) of four channel and two channel systems for the effect of different dispersion values, effect of FWM investigated showed that CSRZ signal is far less sensitive to fiber nonlinear effects, RZ system has reduced dispersion tolerance, NRZ system has improved dispersion tolerance and good transmission performance although it has the effect of inter-symbol interference between the pulses this modulation format is not suitable when high bit rates, showed that BER got improved with duo binary modulation format and by increasing core effective area which will offer a significant performance benefit in digital systems[26-28].Further significant performance improvement shown with CSRZ format, in contrast to the conventional NRZ /RZ formats, over 120km with pre/ post/symmetrical
  3. 3. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 13 dispersion compensation schemes for various input signal powers. Better performance also shown with post compensation scheme in terms of Q value, eye opening over 120km of transmission, for 32-channel DWDM system investigated the Kerr effect of nonlinearity over 120km,illustrated that for 80GHz and above channel spacing the power loss becomes constant and does not depend on the number of channels so for optimal BER and power penalty with 80 GHz channel spacing have to be used.FWM effect also diminished while maintaining bandwidth efficiency with unequal channel spacing using channel allocation method based on the optimal Golomb ruler (Exhaust and Search algorithm)[29-31].Study with 2.5 Gbit/s HDWDM transmission system based on the quasi-rectangular optical filter technique, illustrated that channel interval be greater than 25 GHz and for the 10Gbit/s HDWDM system not less than 37.5 GHz. Implementation of OADM with DWDM transmission, for the dispersion value of 1.5 ps/nm/km, EDFA power of 4dBm and lower value of attenuation factor illustrated optimum performance over three hundred km transmission reach[32-33]. Lots of study has been performed in past but still some unearthed work has to come in front of swiftly varying communication world and investigations on this approach were always going on to achieve higher spectral efficiency which pertains higher data rates per channel and deployment of high-order modulation formats in the multiplexed links. So in this view novel designed MMDWDM (multiple modulations DWDM) links with every thirty two channel DWDM links were designed with fixed optical modulation and each channel operates at 20Gb/s data rate, to investigate for the selected transmission reach. 2. Theoretical Presentment For long haul transmission, modulation is the fundamental necessitate of any communication system and previously for the optical links different types of optical modulation schemes were studied to fulfill the rising need for higher data rates and to cut in links cost. Since past decades on off keying (OOK) in either RZ or NRZ were one of the alternatives for physical layer level of optical communication [34]. Advanced optical modulation formats is one of key component to the design of present optical communication networks having special focus on metro, core and access networks. Thus to modulate a signal the component electrical drivers were used which performs the simulations. It converts the logical input signal, a binary sequence of zeros and ones into an electrical signal. Several mapping laws were available, ranging from simple ones, such as NRZ, NRZ raised cosine and RZ rectangular shaped, RZ raised cosine, RZ Super Gaussian and RZ soliton shaped pulses, a brief of each one is presented below. NRZ Rectangular-With NRZ rectangular driver, an electrical output signal assumes one of the two electrical levels depending upon the transmitted bits. For “0" and "1" fed into the driver, the output signal is at the high level and low level during the entire bit time respectively and switching in between the levels, can be instantaneous for field set(time slope) to zero or else the needed time slope. NRZ Raised Cosine-Here the NRZ raised cosine driver is simulated and switching between the two levels is not instantaneous but it follows a raised cosine shape with a given roll-off, while driver were joined to a linear optical modulator, can shape either the optical amplitude or the optical power. Return to Zero (RZ) Rectangular- This component simulates the RZ rectangular driver. It has an output signal that can assume two electrical levels. When a "1" is transmitted, the output signal is at the High Level for a time equal to the product of the duty cycle by the bit time. Then it goes down to the Low Level for the remaining time. When a "0" is transmitted, the output is constant at the low level for the entire bit time. Switching between the two levels is instantaneous
  4. 4. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 14 with resulting square edges. The parameters duty cycle is the ratio between the time at High Level for the first part of the bit, when a "1" is transmitted, and the bit time. Return to Zero (RZ) Raised Cosine-The return to zero raised cosine driver simulates the RZ raised cosine driver the switching between the two levels were not instantaneous. It follows a raised cosine shape with a selected roll-off generates raised cosine waveform. The raised cosine waveform, when the driver is connected to a linear optical modulator, can shape either the optical amplitude or the optical power. Let for a centered pulse peak in which relative time origin in the center of a bit the electrical output when "1" is transmitted it is with expression shown below: ‫܄‬ = ሺ‫ۯ‬‫ ܐ‬ − ‫ۯ‬‫ܔ‬ሻ܎ሺ‫܂‬ሻ + ‫ۯ‬‫ܔ‬ For raised cosine pulse chosen in power ‫܄‬ = ሺ‫ۯ‬‫ ܐ‬ − ‫ۯ‬‫ܔ‬ሻ܎૛ሺ‫܂‬ሻ + ‫ۯ‬‫ܔ‬ Now for amplitude chosen raised cosine pulse Ah is the high level, Al is the low level and f (t) is standard raised cosine function. ࢌሺࢀሻ = { ૚ ૛ [૚ − ‫ܖܑܛ‬ ቆ࣊ |ࢀ| − ࢀࡸ ࢻࢀࡸ ቇ] fሺ‫܂‬ሻ = ‫ە‬ ۖۖ ‫۔‬ ۖۖ ‫ۓ‬ ૙ , |‫|܂‬ > ‫܂‬‫ ۺ‬ሺ૚ + હሻ ૛ ૚ ૛ ቈ૚ − ‫ܖܑܛ‬ ቆૈ |‫|܂‬ − ‫܂‬‫ۺ‬ હ‫܂‬‫ۺ‬ ቇ቉ , ‫܂‬‫ ۺ‬ሺ૚ − હሻ ૛ ≤ |‫|܂‬ ≤ ‫܂‬‫ ۺ‬ሺ૚ + હሻ ૛ ૚, |‫|܂‬ < ‫܂‬‫ ۺ‬ሺ૚ − હሻ ૛ Where ࢀ = ࢀ࢈ ૚ାહ the parameter α is the roll- off factor and Tb is the bit time. Return to Zero (RZ)_Super-Gaussian-The return to zero (RZ) Super Gaussian driver and for “0" is transmitted the output signal is at the high level and when “1” is transmitted it generates a pulse with Super Gaussian shape during the entire bit time respectively. Now let for a centered pulse peak in which relative time origin in the center of a bit the electrical output when "1" is transmitted it is with expression shown below: ࢂሺ࢚ሻ = ሺ࡭ࢎ − ࡭࢒ ሻࢋ ି૚ሺ ࢚ ࢀ૙ ሻ૛࢓ ૛ + ࡭࢒ Where m is the Super Gaussian order, Al and Ah were the low and high level amplitudes and T0 is related to the TFWHM (full width half maximum time) through this function: ‫܂‬૙ = ‫܂‬۴‫ۻ۶܅‬ √‫ܖܔ‬૛ ૛‫ܕ‬ Return to Zero (RZ)Soliton-It generates a soliton shaped pulse for a "1" is transmitted when employed with return to zero soliton driver and when a "0" is transmitted the output signal is set to the low level for the entire bit time. Now for a peak centered pulse let us assume that a time origin in the center of bit time, then for a transmitted bit “1” the electrical output signal have the expression:
  5. 5. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 15 ‫܄‬ሺ‫܂‬ሻ = ሺ‫ۯ‬‫ ܐ‬ − ‫ۯ‬‫ ܔ‬ሻ‫ܐ܋܍ܛ‬૛ ൬ ‫ܜ‬ ‫܂‬૙ ൰ + ‫ۯ‬‫ ܔ‬ Where Al and Ah were the low and high level amplitudes and T0 is related to the TFWHM (full width half maximum time) through this function: ‫܂‬૙ = ‫܂‬۴‫ۻ۶܅‬ ‫ܖܔ‬૜ + ૛√૛ 3. The Simulink Design Presentment The figure1 shows design of the proposed topology implemented for the simulation and figure 2 shows design used for each single transmitter employed with their respective modulation schemes. Based on these transmitter designs total of six DWDM transmission links have been proposed. Each of the proposed transmission link is having with thirty two channel DWDM optical system, where each channel operated at 20Gb/s.The employed optical modulation of each DWDM link were different such as NRZ rectangular, NRZ raised cosine, RZ rectangular, RZ raised cosine, RZsuperGuassian and RZ soliton optical modulations. In each of the DWDM transmission link transmitter consists of CW laser array, data modulators and the optical multiplexer. The used emission frequency range is 193.79 to 195.102THz with the channel to channel frequency spacing of 100GHz, centre frequency were 193.45 THz. After the optical modulation thirty two channels signals were multiplexed and resulting signal is passed through single mode fiber repeater loop along with pre and post amplification, in which semiconductor optical amplifiers were used at 200mA,Amplifier length of 300nm and while active layer width as 2.5nm. Thereafter signal were optically demultiplexed and dmuxed optical signal passed through their respective optical filters which were tuned to particular channels frequency (with -3dB frequency is 25 GHz) thereafter passed through PIN diode detector. In this for all MMDWDM links at the receiving end out of thirty two channels only randomly selected five channels operating at frequencies 191.9Thz,192.6Thz,193.4Thz,194.2Thz,195Thz were used for the detection. Resulting detected electrical signal is passed through Bessel electrical filter (with -3dB frequency is 20 GHz) thereafter to a measuring instrument such as eye diagram, BER, Q value, eye opening etc. Figure1: General Topology used for DWDM (640Gbps) system
  6. 6. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 16 (a) (b) (c) (d) (e) (f) Figure2:MMDWDM systems with (a)RZ-SuperGuassian (b)RZ_Rectangular (c)NRZ_raised cosine (d)RZ_soliton (e)RZ_raised cosine (f) NRZ_Rectangular 4. Results and Discussion The multiple modulation DWDM optical transmission links each with total transmission capacity of 640Gbps have been designed and their transmission performances were successfully investigated for transmission reach of more than 250kilometers. In each of the MMDWDM designed system every single channel operates at 20Gbps data rate and individual systems were designed with employed modulation formats as NRZ rectangular, NRZ cosine, RZ-recctangular, RZ super Guassian, RZ cosine and RZ_soliton. The transmission performances were examined in terms of quality factor (Q) which represents the signal-to-noise ratio at the receiver decision circuit in voltage or current unit and jitter values which is an estimate of the input signal. Jitter value is estimated as the standard deviation of the position of the maximum of the received signal termed to the bit frame. The simulated results were illustrated for the quality factor transmission reach and jitter vs. transmission reach in the numerous resulting plots. The figure3 depict input optical spectrum for respective MMDWDM (32chx20Gbps) systems at transmitting end. Figure3: Optical spectrum at input with (32chx20Gbps)MMDWDM(a)soliton (b)NRZrect (c)NRZraisedcosine (d)RZraised cosine (e)RZ Super Guassian (f)RZ rectangular modulation DWDM systems.
  7. 7. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 17 Figure4. Quality factor (Q) vs. transmission distance performance with DWDM nrz-rectangular (640Gbps) modulation system The simulated results as exhibited in figure4 for the quality factor (Q) vs. transmission length with NRZ-rectangular (640Gbps) modulation DWDM system. It is noticed that quality factor, which is the performance measuring parameter, is high (Q>6dB) for all of the randomly detected channels but with increase in transmission distance Q factor is diminishing. Figure5: Quality factor (Q) vs. transmission distance performance with DWDM NRZ-raisedcosine (640Gbps) modulation system Figure 5 shows transmission performance for the quality factor (Q) vs. transmission length employing NRZraisedcosine (640Gbps) modulation DWDM system, it is noticed that quality factor (Q) ranging from 16 to 23dB.It have achieved highest quality factor value in the range of 23dB for the randomly detected channels with increase in transmission distance.
  8. 8. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 18 Figure6: Quality factor (Q) vs. transmission distance performance with DWDM RZrectangular (640Gbps) modulation system Figure6 illustrates results for the quality factor (Q) vs. transmission length using RZrectangular (640Gbps) modulation with DWDM system. It is perceived that quality factor is severely degraded (lowest Q=6dB) the randomly detected channels with increase in transmission distance. Figure7: Quality factor (Q) vs. transmission distance performance with DWDM RZraisedcosine (640Gbps) modulation system The simulation result as shown in figure7 for the quality factor (Q) vs. transmission length employing RZraised cosine (640Gbps) modulation DWDM system. It is noticed that overall quality factor is satisfactory (12 to 22dB) for all of the randomly detected channels with increase in transmission distance.
  9. 9. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 19 Figure8: Quality factor (Q) vs. transmission distance performance with DWDM RZsoliton(640Gbps) modulation system The results as shown in figure8 for quality factor (Q) vs. transmission length employing RZsoliton (640Gbps) modulation DWDM system, it is noticed that quality factor is high and satisfactory ranging from 13 to 18dB for all of the randomly detected channels with increase in transmission distance. Thus high quality factor has been achieved with soliton pulse modulation system so transmission performance is excellent. Figure9: Quality factor (Q) vs. transmission distance performance with DWDM RZSuperGuassian (640Gbps) modulation system Figure9 illustrates the simulated results for the quality factor (Q) vs. transmission length with RZSuperguassian (640Gbps) modulation DWDM system. It is observed that quality factor is good ranging from 14 to 26dB, achieved for all of the randomly detected channels with increase in transmission distance its performance is very much satisfactory.
  10. 10. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 20 Figure10: Jitter vs. transmission distance performance of DWDM RZSuperGuassian (640Gbps) modulation Figure11: Jitter vs. transmission distance performance of DWDM RZ-soliton (640Gbps) modulation Figure12: Jitter vs. transmission distance performance of DWDM RZraisedcosine (640Gbps) modulation Figure13: Jitter vs. transmission distance performance of DWDM RZraisedCosine (640Gbps) modulation
  11. 11. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 21 The simulated results were exhibited for the jitter vs. transmission length in the figure10 to figure13 with numerous DWDM (640Gbps) links with different return to zero (RZ) modulation schemes. It is noticed that jitter is growing for all the channels with raise in transmission distance for all the received channels. Figure14: Jitter vs. transmission distance performance of DWDM with NRZ-rectangular (640Gbps) modulation system Figure15: Jitter vs. transmission distance performance of DWDM with NRZ-raised cosine (640Gbps) modulation system Results as shown in figure14 and figure15 for jitter vs. transmission length with DWDM (640Gbps) with non return to zero modulation schemes it is noticed that jitter is constant for all the channels but few received channels show a high jitter value with increase in transmission distance.
  12. 12. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 22 Figure16: BER vs. received channels performance of MMDWDM (640Gbps) at 260K.M For good optical transmission performance quality factor (Q) must be higher and bit error rate must be low, for satisfactory transmission performance of an optical transmission link it requires Q>6dB for the BER of 10-9 .This BER provide an upper limit for the signal because some degradation arises on the receiving end. From the comprehensive performance analysis of MMDWDM transmission links, it is noticed that MMDWDM link with NRZ raised cosine pattern has shown better transmission performance in terms of quality factor, bit error rate (figure16) which were in the range of 10-11 to 10-40 for all received channels at selected transmission reach of 260kilometers, followed by other schemes as Rzsuperguassian and RZSoliton transmission links. While for the same transmission reach (260km) RZrectangular scheme has shown poor transmission performance as compared to other schemes employed. An additional optical transmission parameter of observation is jitter, on observing jitter performance of various transmission links it is noticed that jitter show low impact on DWDM systems with NRZ type of modulations but it is more dominant for the DWDM transmission links with RZ format. 5. Conclusion The article illustrates comprehensive performance study of the multiple modulation DWDM systems each with aggregate capacity of 640Gbps.The systems were employed with different type of modulation schemes such as NRZrectangular, NRZraisedcosine, RZ-recctangular, RZ Super Guassian, RZ cosine and RZ soliton schemes and each system were investigated on the basis of optical transmission parameters such as quality factor, jitter and bit error rate. After successful transmission the performance were compared for the fixed transmission reach of 260kilometers,it exhibited that DWDM link with non return to zero raised cosine scheme has shown better transmission performance followed by Rz superguassian and RZ Soliton in contrast to other schemes employed. Comparing jitter performance for all transmission links, it is observed that jitter effect is more dominant for the DWDM systems with RZ type formats in contrast DWDM transmission links using NRZ format. Consequently from the study it can be inferred that a novel advanced optical modulation scheme is always must to compete with swiftly changing spectrum need, highly efficient system were to design and for that NRZ-Raised cosine (leading scheme), RZ superguassian and RZ Soliton pattern are the other frontier schemes, will be an aid to design of the advanced optical communication systems. 10 -40 10 -30 10 -20 10 -10 10 0 1 2 3 4 5 BER Channel NRZ Rectangular NRZ RaisedCosine RZ RaisedCosine RZ Rectangular RZ SuperGuassian RZ Soliton
  13. 13. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 23 Acknowledgement Thanks to J.K.Institute Allahabad (University of Allahabad) for providing the software OptSim(R-Soft) optical communication system. REFERENCES [1] H.Ishio.J.Minowa, K.Nosu (1984)”Review and status of wavelength-division-multiplexing Technology and its application,” J.Lightwave Techno, vol.2, pp.448-463. [2] G.Winzer(1984)”WDM components review,”J.Lightwave Technol, vol.2, pp.369-378. [3] N.A.Olsson, J.C.Hegarty, R.A.Logan, L.F.Johnson, K.L.Walker (1985).Electron Lett, vol.21, pp.105- 106. [4] C.A.Brackett(1990).IEEE J.Sel.Areas commun,vol.8,pp.948,1990. [5] P.E.Green( 1993)Fiber-Optic Networks.Prentice-Hall,Upper Saddle River,NJ,. [6] B.Mukherjee(1997)Optical communication networks. McGraw-Hill, New York. [7] A.Borella, G.Cancelliera, F.Chiaraluce (1998) WDMA optical networks.ArteeHouseNorwood, MA, 1998. [8] R.A Barry (1998) Optical Networks and Their Applications. Optical Society of America Washington, DC, 270-273. [9] T.E.Stern, K.Bala (1999) Multiwavelength Optical Networks. Addison Wesley, Reading, MA, 1999. [10] G.E.Keiser (2000) Optical Fiber Communications.3rd ed. McGraw-Hill, New York, 2000. [11] K.M.Sivalingam,S.Subramaniam,Eds(2000)Optical WDM Networks: Principals and Practics.Kluwer Academic,Norwell,MA. [12] M.T.Fatehi, M.Wilson (2001) Optical Networking with WDM, McGraw-Hill,New York,2001. [13] Rami Haddad and M. I. Hayee,(2005)” Spectral Efficiency of up to 1.6 bit/sec/Hz in Binary NRZ WDM Systems using Electronic Signal Processing,” OSA 2005.JThC75. [14] M. A. Khayer Azad,M. S. Islam (2009)”Performance Limitations of WDM Optical Transmission System Due to Cross-Phase Modulation in Presence of Chromatic Dispersion,”conf-ICACT2009, IEEE conf.,pp-1877-81,2009. [15] A.R.Chraply, A.H.Gluck, R.WTkach, R.M.Derosieret.al (1995), IEEE Photon Technol. Lett, vol.7, pp.98. [16] A.Sangeetha,Dr.S.K.Sudheer,K.Anusudha(May2009)”Performance analysis of NRZ, RZ, and Chirped RZ transmission formats in Dispersion managed 10 Gbps long-haul WDM light wave systems,” ACEEE-International Journal of Recent Trends in Engineering, vol. 1, no. 4,pp.103-05. [17] Kawal Preet Singh, Navpreet Singh, et.al (March 2012)” Performance Analysis of different WDM Systems, “JEST, volume. 4, No.03, pp.1140-44. [18] P.R. Trischitta, et al (1996) The TAT-12/13 cable network, IEEE Commun. Mag., 1996. [19] W.C. Barnett, et al. (1996) The TPC-5 cable network, IEEE Commun. Mag., 1996. [20] A. Richter, (February 2002) Timing Jitter in long-haul WDM return-to-zero systems, a thesis, Berlin, February 2002. [21] M.I.Hayee,A.E.Willner (August 1999) “NRZ versus RZ in 10-40-Gb/s dispersion-managed WDM transmission systems”, IEEE Photonics Technology Letters, August 1999. [22] H. Sunnerud, M. Karlsson, P. A. Andrekson,( May 2001) “A comparison between NRZ and RZ data formats with respect to PMD-induced system degradations,” IEEE Photonics Technology Letters, vol.13 (5), pp.448–450. [23] Rajni,Raju pal,Vishal Sharma(July 2012)”Comparison of Pre-, Post- and Symmetrical-Dispersion Compensation Schemes for 10/15Gbps using Different Modulation Formats at Various Optical Power Levels using Standard and Dispersion Compensated Fibers”IJCA (0975 – 8887).50(21):6-8. [24] D.K.Tripathi et.al(2012),” Study in order and width of RZ super Gaussian pulse for different bit rate optical communication link with dispersion managed SMF (G655),”IEEE- Conf.ICPCES2012Allahabad(India). [25] H. Chaouch, F. Küppers(2010),” Simulation and Optimization of 100 Gbit/s Single Channel Modulation Formats,”IEEE -Int. conf. on Telecommunication2010,pp498-502. [26] Kawal Preet Singh,Navpreet Singh, et.al(March 2012)”Performance Analysis of different WDM systems,” IJEST, Vol. 4 No.03,pp.1140-44., [27] Laxman Tawade,Shantanu Jagdale(November 2010)” Investigation of FWM effect on BER in WDM optical communication system with binary and duo binary modulation format, “International Journal of Distributed and Parallel Systems (IJDPS) Vol.1, No.2,pp.109-116.
  14. 14. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 [28] Kawal Preet Singh, Navpreet Singh et.al (March 2012)” Performance Analysis of different WDM Systems, “JEST, vol.4, no.03, pp.1140 [29] Bobby Barna et.al(2012)” Evaluate the Effect of Stimulated Raman Scattering in DWDM Transmission System with Direct Detection Binary WSK Receiver,” IEEE/OSA/IAPR International Conference on Infonnatics, Electronics & Vision, ICIEV 2012,pp.698 [30] Lucky Sharan,V K Chaubey(2012)” Design and Simulation of CSRZ Modulated 40Gbps System in Presence of Kerr Non Linearity,”IEEE [31] S Sugumaran, Neeraj Sharma et. al (Apr and its Suppression Using Optimum Algorithms,“JET, vol 5 no 2, pp.1432 [32] Ģ. Ivanovs, V. Bobrovs, et.al (May 2010)” Realization of HDWDM transmission system,” International Journal of the Physical Sciences Vol. 5(5), pp. 452 [33] D.K.Tripathi et.al (June 2013)”Optimization and performance study in DWDM for PON’s with OpticalADM,” IJARECE, Volume 2, Issue 6, pp.607 [34] G. P. Agrawal,(2002)“Fiber Optic Communications Systems”, third edition, 2002, Wiley Series in microwave and optical engineering, 2002. Authors: D. K. Tripathi received his BSc from A.U and B. Tech and M. Tech degree in Electronics and Telecommunication engineering from the Department of Electronic & Communication, University of Allahabad. Presently he is pursuing his Ph.D. degree in Electronics Engineering. His area of interest includes Wireless communication technology and fiber optics communication. He is life member of ISTE Pallavi Singh received B.Tech and M.Tech degrees in electronics and Telecommunication engineering from Department of Electronics & Communication University of Allahabad, in 1999 and 2002, respectively, where she is currently pursuing her Ph.D.degree in electronic engineering. Her current research interests include wavelength converter and all logic gates using SOA-based Mach- . Dr N.K. Shukla is associate Professor in J.K.Institute of Applied Physics and Technology, University of Allahabad (India). He started teaching in the department as lecturer, having teaching experience of more than 18 Years. His main research area is fiber optics communication and Holography. He has supervised many PhD candidates. He has published a lot of papers in National, International journals and in National and International conferences. He is a member of many academic bodies of other University and institution, and life member and fellow in organizations like ISTE, IETE etc. Prof. (Dr) H.K. Dixit is former head of department of J.K. Institute of Applied Physics and Technology, University of Allahabad (India). He started teaching in the department as lecturer in March 1975 and teaching experience of more than 38 Years. His main research area is fiber optics communication and Holography. He has supervised a number of PhD candidates. He has published a lot of papers in National, International journals and in National and International conferences. He is a member of a number of RDC, and academic bodies of other University and Institution, and life member and fellow in organizations like ISTE, IETE etc. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 Kawal Preet Singh, Navpreet Singh et.al (March 2012)” Performance Analysis of different WDM Systems, “JEST, vol.4, no.03, pp.1140-44. rna et.al(2012)” Evaluate the Effect of Stimulated Raman Scattering in DWDM Transmission System with Direct Detection Binary WSK Receiver,” IEEE/OSA/IAPR International Conference on Infonnatics, Electronics & Vision, ICIEV 2012,pp.698-701. n,V K Chaubey(2012)” Design and Simulation of CSRZ Modulated 40Gbps System in Presence of Kerr Non Linearity,”IEEE-2012, 978-1-4673-1989-8/12/$31.00 ©2012 IEEE. S Sugumaran, Neeraj Sharma et. al (Apr-May 2013)”Effect of Four-wave Mixing on WDM Sy and its Suppression Using Optimum Algorithms,“JET, vol 5 no 2, pp.1432-1444. . Ivanovs, V. Bobrovs, et.al (May 2010)” Realization of HDWDM transmission system,” International Journal of the Physical Sciences Vol. 5(5), pp. 452-458. D.K.Tripathi et.al (June 2013)”Optimization and performance study in DWDM for PON’s with OpticalADM,” IJARECE, Volume 2, Issue 6, pp.607-610. G. P. Agrawal,(2002)“Fiber Optic Communications Systems”, third edition, 2002, Wiley Series in optical engineering, 2002. received his BSc from A.U and B. Tech and M. Tech degree in Electronics and Telecommunication engineering from the Department of Electronic & Communication, University of Allahabad. Presently he is pursuing his Ph.D. degree in Electronics Engineering. His area of interest includes Wireless communication technology and fiber optics communication. He is life member of ISTE ceived B.Tech and M.Tech degrees in electronics and Telecommunication engineering from Department of Electronics & Communication University of Allahabad, in 1999 and 2002, respectively, where she is currently pursuing her Ph.D.degree in electronic ing. Her current research interests include wavelength converter and all-optical -Zehnder interferometer Dr N.K. Shukla is associate Professor in J.K.Institute of Applied Physics and Technology, India). He started teaching in the department as lecturer, having teaching experience of more than 18 Years. His main research area is fiber optics communication and Holography. He has supervised many PhD candidates. He has ational, International journals and in National and International conferences. He is a member of many academic bodies of other University and institution, and life member and fellow in organizations like ISTE, IETE etc. head of department of J.K. Institute of Applied Physics and Technology, University of Allahabad (India). He started teaching in the department as lecturer in March 1975 and teaching experience of more than 38 Years. His main research communication and Holography. He has supervised a number of PhD candidates. He has published a lot of papers in National, International journals and in National and International conferences. He is a member of a number of RDC, and academic University and Institution, and life member and fellow in organizations like ISTE, IETE etc. Electrical and Electronics Engineering: An International Journal (ELELIJ) Vol 3, No 1, February 2014 24 Kawal Preet Singh, Navpreet Singh et.al (March 2012)” Performance Analysis of different WDM rna et.al(2012)” Evaluate the Effect of Stimulated Raman Scattering in DWDM Transmission System with Direct Detection Binary WSK Receiver,” IEEE/OSA/IAPR International n,V K Chaubey(2012)” Design and Simulation of CSRZ Modulated 40Gbps-DWDM 8/12/$31.00 ©2012 IEEE. wave Mixing on WDM System . Ivanovs, V. Bobrovs, et.al (May 2010)” Realization of HDWDM transmission system,” D.K.Tripathi et.al (June 2013)”Optimization and performance study in DWDM for PON’s with G. P. Agrawal,(2002)“Fiber Optic Communications Systems”, third edition, 2002, Wiley Series in International conferences. He is a member of many academic bodies of other University head of department of J.K. Institute of Applied Physics and Technology, University of Allahabad (India). He started teaching in the department as lecturer in March 1975 and teaching experience of more than 38 Years. His main research communication and Holography. He has supervised a number of PhD candidates. He has published a lot of papers in National, International journals and in University and Institution, and life member and fellow in organizations like ISTE, IETE etc.

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