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Simulative analysis of power effects for 2.5×8 gbs wdm pon
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1. International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME220SIMULATIVE ANALYSIS OF POWER EFFECTS FOR 2.5×8GB/SWDM-PON SYSTEM FOR CSRZ, DRZ AND MDRZ DATA FORMATSMalti1, Rajesh Luther2and Rakesh Sharma31, 2, 3Sri Sai Institute of Engg. & Tech., Amritsar, Punjab, IndiaABSTRACTIn this paper, simulative analysis of 2.5×8Gb/s WDM-PON system has been carriedout for carrier suppressed return to zero (CSRZ), duobinary return to zero (DRZ) andmodified return to zero (MDRZ) modulation formats by varying power effects (0-20dBm). Itis observed that the system gives optimum performance at input power Pin = 20dBm. It isfound that CSRZ gives more optimum performance as compared to DRZ and MDRZ whenPin = 20dBm. Further, the effect of variation in input power Pin and transmission distance upto 130km has been observed in terms of Q-value and Max. eye opening factor for CSRZ,DRZ and MDRZ modulation formats. The system performance has been also evaluated byvarying bit rate at 2.5Gb/s, 5Gb/s and 10Gb/s and it is observed that the system gives bestresults at bit rate 2.5Gb/s.Keywords: WDM-PON, CSRZ, DRZ, MDRZ, OLT, ONU.I. INTRODUCTIONTo meet the bandwidth demand due to the exponential growth of broadband services,WDM-PON will be one of the most efficient way for the next generation access network. Tomeet the increasing demand of network bandwidth, Service Provider (SP) must providebroadband services to many subscribers. In traditional PON, the number of ONUs is limitedby optical splitter attenuation in a single wavelength. However, combining WDM technologywith PON architecture will provide even hundreds of wavelengths in an access network, soWDM-PON is considered an effective way to solve the bottleneck problem to have largenumbers of end users . Much attention has been focused on the wavelength divisionmultiplexed passive optical network (WDM-PON) for next-generation broadband accessarchitecture, due to its large bandwidth, upgrade flexibility and security with dedicatedINTERNATIONAL JOURNAL OF COMPUTER ENGINEERING& TECHNOLOGY (IJCET)ISSN 0976 – 6367(Print)ISSN 0976 – 6375(Online)Volume 4, Issue 3, May-June (2013), pp. 220-228© IAEME: www.iaeme.com/ijcet.aspJournal Impact Factor (2013): 6.1302 (Calculated by GISI)www.jifactor.comIJCET© I A E M E
International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME221connections. A WDM-PON solution provides scalability because it can support multiplewavelengths over the same fiber infrastructure, is inherently transparent to the channel bitrate, and it does not suffer power-splitting losses.Bock et al.  described WDM/TDM-PON architecture by using Free Spectral Range(FSR) periodicity and AWG. In this a shared tunable laser, photo receiver, DBA and remotemodulation were used for transmitter and receiver. Transmission test showed correctoperation at 2.5Gb/s up to 30km. By mean of optical transmission test the authorsdemonstrated that this architecture was feasible and offered good performance with lowoptical losses as compared to other PON architectures.Yi-Hung Lin et al.  demonstrated AWG Channel bandwidth dependent BER powerpenalty of 8 dB for the 1.25Gbit/s DWDM-PON systems with channel spacing of 50 and 200GHz using ASE injection-locked reflective SOA with 1% front-facet reflectance. Eventhough the color-free operation had not yet been realized due to high front facet reflectivity,they had shown that the nearly mode independent operation of such a RSOA basedDWDMPON with 50-GHz AWG mode spacing is possible to achieve a better upstreamtransmission performance.Q.T. Nguyen et al.  demonstrated Error-free transmission over 20km of 8-channelsfor both downstream and upstream in colourless WDM-PON based on injection-lockedFabry-Perot laser experimentally at 2.5Gbit/s, using a single quantum dash mode-lockedlaser as multi-wavelength seeding source.Hanlin Feny et al.  used a scheme in which modified NRZ format to realize multicastWDM-PON by adjusting downstream extinction ratio and achieved good BER rateperformance for upstream signals.Jun-Ichi Kani et al.  discussed the key role of WDM technologies in realizing thenext generation scalable and flexible PONs. That is one was WDM-PON in which eachONU used different wavelength i.e a unique wavelength in each direction to communicatewith OLT and it also combined WDM and TDM technology.Han et al.  proposed a WDM-PON model with multicast capability like highscalability multi-wavelength converter and single copy broadcast capability by employingmultistage AWGs at remote node. The result of this architecture was evaluated in terms ofcost, scalability, link capacity and bandwidth per user in both upstream and downstreamsignals. In this architecture, the existing passive star coupler was replaced by a specialpassive optical device.Gerd Keiser et al.  proposed and demonstrated a method for simultaneous real-timestatus monitoring and troubleshooting of a high-capacity single-fiber bidirectional passiveoptical network (PON) that is based on WDM techniques. To avoid interference between thebidirectional traffic, downstream and upstream signals were assigned in different spectralbands. The two main parts of the monitoring and fault-diagnosis functions were a traffic-directing and amplification module and a signal-selection switch module. Using an opticaltime-domain reflectometer, the fault-diagnosis test path can be greater than 50 km. Testsresults were presented for 10-Gb/s upstream and downstream links over 35-km distances.Zhixin Liu et al.  proposed and demonstrated an optical multicast overlay schemeon a wavelength-division-multiplexed passive optical network, employing bandwidthefficient inverse return-to-zero duobinary signals. Multicast control was realized by tuningthe voltage bias at the point-to-point downstream modulator at the optical line terminal. The10Gb/s downstream operation of the proposed optical multicast overlay scheme and 2.5-Gb/scarrier distributed upstream transmission had been experimentally demonstrated.
International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME222DFBLaserArrayWDMMulti-plexerCircu-latorsCSRZ/DRZor MDRZModulatorAWG8*8Circu-lators3R-RegeneratorLow Pass BesselFilterQmeasurementBER AnalyserPINDetectorOpticalTransmitterPowerSplitterEDFAAWG1*8Rajniti et al.  compared the performance of two modulation formats non return tozero (NRZ), return to zero (RZ) for 2.5Gb/s bidirectional WDM/TDM-PON using narrowbandAWG. They investigated the impact of extinction ratio (ζ) of Mach-Zehnder (MZ) amplitudemodulator on the performance of WDM-PON for varying optical fiber lengths. The systemperformance had been analyzed by varying the value of ζ from 2 to 22dB. They found that thesystem gave optimum performance at extinction ratio (ζ) value 20dB. Further, the effect ofvariation in the input power (from 0 to 20dBm) and transmission distance upto 60km wasobserved in terms of Q value and eye opening for NRZ and RZ data formats. They found thatNRZ was superior to RZ and system gave optimum performance at input power Pin=10dBm.In this paper, we have extended the work of reference , they compared theperformance of two modulation formats non return-to-zero (NRZ), return-to-zero (RZ) for2.5Gb/s bidirectional WDM/TDM-PON using narrowband AWG. They evaluated the systemperformance by varying input power (from 0 to 20dBm) and transmission distance up to 60km.We have evaluated the system performance by using advanced modulation formats andtransmission distance upto 130km has been observed in terms of Q value and eye opening factor.Here, in section 2, the system description and simulation parameters have been described. Insection 3, the results of the simulated system have been reported for different modulation dataformats, signal input power, bit rate and distance. Finally in section 4, conclusions are made.II. SYSTEM DESCRIPTION AND SIMULATIONThe Schematic of optical communication system simulation setup is shown in Fig.1. Anexternally modulated CW DFB Laser Array having eight number of output ports, havingfrequency of 1550nm, having channel spacing of 100GHz with variable input power (from 0 to20dBm) is used. The WDM multiplexer also operates at the frequency of 1550nm with thebandwidth 10GHz and channel spacing of 100Ghz.Fig.1: Schematic of Simulation Setup
International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME223Three different types of modulation formats carrier suppressed return to zero (CSRZ),duobinary return to zero (DRZ) and modified return to zero (MDRZ) has been used. AnErbium Doped Fiber Amplifier with gain 17dB and noise figure 6dB is used in the transmitterto boost the optical signal to the desired power level. The EDFA is followed by power splitterand upstream circulator with return loss and isolation of 60dB Array waveguide gratingAWG (8×8) with frequency of 193.4THz and bandwidth 10GHz is used for upstream andAWG(1×8) with frequency of 1550 nm and bandwidth of 10GHz is used for downstream. Abidirectional Single Mode Fiber SMF fiber with parameters attenuation of 0.24dB/km,dispersion slope of 0.075 ps/km-nm2and dispersion at 1550nm is 16.75ps/km-nm has beenused and the length of fiber has been varied up to 130km.III. RESULTS AND DISCUSSIONThree modulation formats have been compared by varying input power Pin (0-20dBm)and transmission distance up to 130 km for 2.5×8Gb/s WDM-PON system in terms of Qvalue [dB] and eye opening factor. To estimate the performance, the Q value [dB] andmaximum eye opening factor for the eye diagram of electrical scope have been considered forchannel 1 and channel 4. We have evaluated the system performance by varying bit rate at2.5Gb/s, 5Gb/s and 10Gb/s and it is observed that the system gives optimal transmissionwhen the data is transmitted at the bit rate of 2.5Gb/s. The Fig. 2(a), 2(b) and 2(c) shows thegraphical representation of Q value as a function of signal input power for CSRZ, DRZ andMDRZ data formats for downstream data respectively.0 2 4 6 8 10 12 14 16 18 20020406080100120140160Signal input power Pin(dBm)Q.factor(dB)2.5Gb/sCh12.5Gb/sCh45Gb/sCh15Gb/sCh410Gb/sCh110Gb/sCh4Fig. 2(a) Pin (dBm) Vs Q factor(dB) for CSRZ data format at distance 20kmIt can be seen that all the formats that as the signal input power increases from 0 to15dBm, Q value increases after which it starts falling. From this it is observed that for lowpowers the performance of WDM-PON system increases with the increase in input power.
International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME2240 2 4 6 8 10 12 14 16 18 20020406080100120Signal input power Pin(dBm)Q.factor(dB)2.5Gb/sCh12.5Gb/sCh45Gb/sCh15Gb/sCh410Gb/sCh110Gb/sCh4Fig. 2(b) Pin (dBm) Vs Q factor(dB) for DRZ data format at distance 20km0 2 4 6 8 10 12 14 16 18 20020406080100120140Signal input power Pin(dBm)Q.factor(dB)2.5Gb/sCh12.5Gb/sCh45Gb/sCh15Gb/sCh410Gb/sCh110Gb/sCh4Fig. 2(c) Pin (dBm) Vs Q factor(dB) for MDRZ data format at distance 20kmHowever, with increases in power, the wavelength tend to overlap each other causingmore dominance of non linear effects like Cross Phase Modulation (XPM) and Four WaveMixing (FWM) and thus reducing the Q value after 15dBm. It is also been observed that by usingvariable bit rate the system gives best performance at bit rate 2.5Gb/s. The graph clearly showsthat end channels are more affected by inter-channel FWM and noise as compared to middlechannel.The Fig. 3(a), 3(b) and 3(c) shows the graphical representation of Q value as a function oftransmission distance at varied input power and bit rate of 2.5Gb/s WDM-PON system for CSRZ,DRZ and MDRZ data formats for downstream signals respectively. The graph shows that as thedistance increases Q value deteriorates due to FWM effect and ASE noise.10 20 30 40 50 60 70 80 90020406080100120140160180Length(kms)Q.factor(dB)Power = 10dBm & Bit rate = 2.5Gb/sCSRZDRZMDRZFig.3 (a) Length(km) Vs Q.factor(dB) for CSRZ, DRZ and MDRZ modulation formats at inputpower Pin = 10dBm and bit rate = 2.5Gb/s
International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME22510 20 30 40 50 60 70 80 90 100 110050100150Length(kms)Q.factor(dB)Power = 15dBm & Bit rate = 2.5Gb/sCSRZDRZMDRZFig.3(b) Length(km) Vs Q.factor(dB) for CSRZ, DRZ and MDRZ modulation formats at inputpower Pin = 15dBm and bit rate = 2.5Gb/sIt can also be seen from the graphs that for the input power Pin=10dBm and transmissiondistance more than 90km, the Q value drops below the minimum required value of 6dB forCSRZ, DRZ and MDRZ formats, due to ASE noise of EDFA’s. When bit rate for WDM-PONsystem is 2.5Gb/s, the CSRZ gives better performance as compared to DRZ and MDRZmodulation data formats.0 20 40 60 80 100 120 1400102030405060Length(kms)Q.factor(dB)Power = 20dBm & Bit rate = 2.5Gb/sCSRZDRZMDRZFig.3(c) Length(km) Vs Q.factor(dB) for CSRZ, DRZ and MDRZ modulation formats at inputpower Pin = 20dBm and bit rate = 2.5Gb/sFig. 4(a) Eye Diagram at Pin=15dbm for CSRZ data format at distance 40km
International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME226Figure 4(a), 4(b) and 4(c) shows the eye diagrams for downstream data respectivelyfor CSRZ, DRZ and MDRZ modulation formats at distance 40km. These results furtherendorse the results of earlier discussion. The results obtained are also consistent with theresults reported in .Fig. 4(b) Eye Diagram at Pin=15dbm for DRZ data format at distance 40kmFig. 4(c) Eye Diagram at Pin=15dbm for MDRZ data format at distance 40kmSimilarly, Figure 5 shows the optical spectrums for CSRZ, DRZ and MDRZmodulation formats with input power Pin=15dBm and at the distance of 40km having bit rateof 2.5Gb/s. These results further endorse the results of earlier discussion.
International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME227(a) (b)(c)Fig. 5 Showing optical spectrum with Pin=15dbm at distance 40km having bit rate of 2.5Gb/sfor different modulation formats (a) CSRZ (b) DRZ (c) MDRZNo further increase in system performance could be observed after input power Pin=20dB.The best Q value obtained is 217.63dB and 190.85dB at Pin=15dBm and Pin=10dBm atbit rate of 2.5Gb/s for CSRZ data format respectively.IV. CONCLUSIONWe have simulated 2.5×8Gb/s bi-directional WDM-PON system by varying inputpower Pin, bit rate and transmission distance. It has been observed that as the signal inputpower increases, Q value also increase up to 15dBm after which it starts decreasing due inter-channel interference and non linear effects such as Cross Phase Modulation (XPM) and FourWave Mixing (FWM). Further, It is concluded that system gives better performance at bitrate 2.5Gb/s for WDM-PON system as compared to 5Gb/s WDM-PON system. At bit rate2.5Gb/s CSRZ gives better performance for WDM-PON system and at bit rate of 5Gb/sMDRZ gives better performance as compared to other formats.
International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), ISSN 0976 – 6375(Online) Volume 4, Issue 3, May – June (2013), © IAEME228REFERENCES1. K. Iwatsuki, "Applications and Technical Issues of Wavelength-DivisionMultiplexing Passive Optical Networks With Colorless Optical Network Units[Invited]," Journal of Optical Communications and Networking”, vol. 1, pp. C17-C24,2009.2. Carlos Bock, Josep Prat, Stuart D. Walker “Hybrid WDM/TDM-PON using AWGFSR and featuring centralized light generation and dynamic bandwidth allocation,”Spanish ministerio technology project TIC2002-00053 (2005).3. Yi-Hung Lin, Tzu-Kang Cheng , Hai-Lin Wang, Gong-Cheng Lin, and Gong-Ru Lin,“Effect of AWG channel bandwidth on BER of injection-locked RSOA based ONU inWDM-PON system” , International Conference on Photonics in Switching, 2008.4. Q.T. Nguyen, P. Besnard, L. Bramerie, A. Shen, G.H. Duan, C. Kazmierski, J.-C.Simon, “Bidirectional Transmission in Colourless WDM-PON based on Injection-Locked Fabry-Perot Laser at 2.5 Gbit/s using Low-Cost Seeding Source” , ECOC2009, 20-24 September, 2009, Vienna, Austria.5. Hanlin Feny, Fengqing Liu, “A novel scheme of multicast WDM-PON usingmodified NRZ signal format” , IEEE 2009.6. Jun-Ichi Kani, “Enabling technologies for future scalable and flexible WDM-PONsystem” , IEEE journal of selected topics in quantum electronics, vol. 16, no. 5,september/october 2010.7. Kyeong-Eun Han, Kyoung-Min Yoo, Won Hyuk Yang, Young-Chon Kim “Design ofAWG based WDM-PON architecture with multicast capability,” Proceedings of theIEEE INFOCOM (2008).8. Gerd Keiser, Chu-Lin Chang, Zih-Rong Lin, and Cheng-Kuang, “Status MonitoringConcept for a WDM PON” , International Congress on Ultra ModernTelecommunications and Control Systems and Workshops(ICUMT),2010.9. Zhixin Liu, Yang Qiu, Jing Xu, and Chun-Kit Chan, “An Optical Multicast OverlayScheme for a WDM PON Using Inverse-RZ-Duo binary Signals” , IEEE photonicstechnology letters, vol. 23, no. 4, february 15, 2011.10. Rajniti, Anu Sheetal “Comparison of RZ and NRZ Data Formats for 2.5Gb/sBidirectional WDM/TDM-PON using Narrowband AWG” International Journal ofVLSI and Signal Processing Applications, Vol. 1, Issue 2 , May 2011,(95-101) ,ISSN2231-3133.11. Manish Saxena, Dr.Anubhuti Khare and Amit R.Mahire, “Comparative Analysis ForHigher Channel Isolation using Single FBG Filter and Two FBG Filter ConnectedOne After One For High Dense WDM System”, International journal of Electronicsand Communication Engineering &Technology (IJECET), Volume 4, Issue 2, 2013,pp. 497 - 503, ISSN Print: 0976- 6464, ISSN Online: 0976 –6472.12. Prof. J. R. Pathan, Prof. A. R. Teke, Prof. M. A. Parjane and Prof. P.S. Togrikar,“Dropping Based Contention Resolution for Service Differentiation to Provide Qos inWDM OBS Networks”, International Journal of Computer Engineering &Technology (IJCET), Volume 4, Issue 1, 2013, pp. 218 - 228, ISSN Print:0976 – 6367, ISSN Online: 0976 – 6375.
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