Comparative analysis for higher channel isolation using single

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Comparative analysis for higher channel isolation using single

  1. 1. International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 2, March – April (2013), © IAEME497COMPARATIVE ANALYSIS FOR HIGHER CHANNEL ISOLATIONUSING SINGLE FBG FILTER AND TWO FBG FILTER CONNECTEDONE AFTER ONE FOR HIGH DENSE WDM SYSTEMMr. Manish saxena1, Dr.Anubhuti Khare2, Mr.Amit R.Mahire31Assist. Prof.(EC Dept.) Bansal Institute of Science and Technology, Bhopal2Associate Prof. (EC Dept.) UIT RGPV, Bhopal3PG student at Bansal Institute of Science and Technology, BhopalABSTRACTThe high dense WDM system is used with bandwidth utilization using high data ratesand low channel spacing. But the in High dense WDM system because of high data rates thechannel interference occurs and due to which crosstalk occurs and the signal get distorts. Toavoid such problems we can use fiber bragg grating filter. The high data rates range isminimum 2.5 Gbits/s to maximum 40 Gbits/s for channel spacing 200Ghz, 100Ghz, 50 Ghz,25 GHz for this paper. We used minimum data rate 2.5 Gbits/s and maximum data rates10.52 Gbits/s for low channel spacing. We carried two simulation using simulation softwareoptisystem 10.0 for haigh data rates and low channel spacing to get higher channel isolationin High dense WDM system. To get high channel isolation we use FBG filter which includesthree different apodization profile like uniform apodization profile, Gaussian apodizationprofile and Tanh (hyperbolic Tangent) profile. In first simulation we used single FBG filterincluding all these three apodization profile and in second simulation we used two FBG filterincluding all these three apodization profile in which Gaussian apodization profile is best for10.52 Gbits/s data rates for 100 Ghz channel spacing.Keywords: Fiber Bragg Grating, High Dense WDM System, Apodization profiles, DataRates, Channel Isolation, Bandwidth.I. INTRODUCTIONThe high data rates and low channel spacing is used in high dens WDM system forbandwidth saving [1,2].In WDM system channel interference i.e. crosstalk is occurred due towhich singnal get distort. The high data rates and low channel spacing is used for 5The highINTERNATIONAL JOURNAL OF ELECTRONICS ANDCOMMUNICATION ENGINEERING & TECHNOLOGY (IJECET)ISSN 0976 – 6464(Print)ISSN 0976 – 6472(Online)Volume 4, Issue 2, March – April, 2013, pp. 497-503© IAEME: www.iaeme.com/ijecet.aspJournal Impact Factor (2013): 5.8896 (Calculated by GISI)www.jifactor.comIJECET© I A E M E
  2. 2. International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 2, March – April (2013), © IAEME498data rates and low channel spacing is used for making consistency in amplitude and phase ofthe transmitting signal of WDM system [1,2]. Ihe range of high data rates is 2.5 Gbits/s to 40Gbits/s and low channel spacing range is 200 Ghz,100 Ghz,50Ghz,25Ghz is used for highdense WDM system [1,2,3]. The data rates used here are 2.5 Gbits/s and 10.52 Gbits/s.Weused fiber bragg grating filter for higher channel isolation.FBG has characteristics to reflectdesired wavelength of signal and transmit other wavelength of signal. In this paper we haveused three different apodization profile in FBG filter for high channel isolation for differentbandwidth -3 db to -20db level. There is higher suppression of side lobes [1,2,3].II. SYSTEM SIMULATION SETUPIn this paper we have used two different simulation programs where differentapodization and low channel spacing is used for hifher channel isolation.In first simulationwe simulate high dense WDM system. The whole system consists of transmitter,WDM muxand WDM demux,optical fiber of 40 km length,the single mode fiber has a large coreeffective area 80 µm2, attenuation α = 0.2 dB/km, and dispersion 16 ps/nm/km at thereference wavelength λ =1550 nm,FBG filter having three different apodizationprofile,optical reciver filter has cut off frequency of 0.75x bit rate in hz The transmitter shown infigure no.1 is WDM transmitter has 8 no.of output ports,frequency of 1550 nm,frequency spacing is 200Ghz, 100 Ghz, 50 Ghz, 25 Ghz,power is 4 dbm and modulation type for data stream is NRZ.Thereceiver has PIN photodetector then visulizers are used like optical spectrum analyzer,Eye diagramanalyzer,BER analyzer.The output of the WDM transmitter is connected to optical fiber having length40 km thorough which NRZ modulated signal get passed, the data rate for transmitting the signal is 2.5Gbits/s or 10.52 Gbits/s and it pass through FBG filter,the FBG filter having three different apodizationprofiles like uniform apodization ptofile,Gaussian apodization profile,Tanh (hyperbolic tangent)profile,the output of the FBG filter is fed to the PIN photodetector which convert light signal intoelectrical signal,the visulizers are used to check or show the result shown in following figureno.1.[1,2,6,7]Figure 1- Simulation scheme with WDM transmitter, NRZ pulse generator with different transmissionspeed 2.5 Gbits/s and 10.52 Gbits/s
  3. 3. International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 2, March – April (2013), © IAEME499In second simulation we simulates same high dense WDM system with two FBG filterconnected back to back to each other in which first FBG filter has uniform apodization profile andsecond FBG has all three apodization profile like uniform apodization profile,Gaussianapodization profile and Tanh (hyperbolic Tangent) profile.The system transmitter shown infigure no.2 is having 4 channels with some non linear effects such as self phase modulation,cross phase modulation, Four wave mixing. The transmitter includes user define data streamconnect to NRZ pulse generator which provides NRZ modulation of data stream and NRZmodulated data is passed through Mach-Zehnder modulator and continuous wavelength lasersource with 4 dbm power connected to another terminal of external Mach-Zehndermodulator. The data source produces data with data rate of 2.5 Gbit/s or 10.52 Gbit/s bitstream, which is to be transfer through multiplexer then optical fiber of 40The single modefiber has a large core effective area 80 µm2, attenuation α = 0.2 dB/km, and dispersion 16ps/nm/km at the reference wavelength λ =1550 nm and thensignal is passed throughdemultiplxer,and output of demultiplxer is fed to two FBG filter which are connected back toback each other then signal is given to receiver which consists of PIN photodetecor,low passBessel filter and visulizers like optical spectrum analyzer,Eye diagram analyzer,BERanalyzer. In this way we get optical pulse of all four channels. Which are then combine withpower combiner and send via single mode fiber. [1,2,6,7].Figure 2- Four channel simulation scheme with N RZ pulse generator and differenttransmission speed 2.5 Gbit/s and 10.52GbitIII. RESULTSIn our simulator we have used FBG filter having three different apodization profilesfor channel spacing 200 Ghz, 100 Ghz, 50 Ghz, 25 Ghz for data rates 2.5 Gbits/s and 10.52Gbits/s.we study comparatively by using single FBG filter having three different apodization profiles forall four channel spacing and two FBG filter connected back to back to each other in which first FBGfilter has common uniform apodization profile and in second FBG filter has all three apodizationprofiles afor all four channel spacing.The FBG filter reflect desired signal and transmit all other.we have
  4. 4. International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 2, March – April (2013), © IAEME500used c visualizers like optical spectrum analyzer, Bit Error Rate analyzer for checking theresults.we have got eye diagram,power vs wavelength graph,BER graph in both simulationfor data rates of 2.5 Gbit/s or 10.52 Gbit/s and channel spacing.We compared the results ofchannel spacing of 200 Ghz and 100 Ghz for data rates 2.5 Gbits and 10.52 Gbits/s by usingsingle FBG filter and two FBG filters connected back to back to each other.In case of firstsimulation for 2.5 Gbits/s the speed performance is better for uniform apodizationprofile,tanh apodization profile than Gaussian apodization profile because bit error rate arezero and higher quality factor for 200 Ghz and 100 Ghz channel spacing but the data rate oftransmitting of data is very low it is 2.5 Gbits/s and BER is less for both channel spacing i.e200 Ghz and 100 Ghz.From simulation results of of 10.52 Gbits /s data rates we observed thatthe speed performance is better in uniform apodization profile because of lower BER valuesthan other two apodization profile i.e. Gaussian apodization profile and Tanh ( hyperbolictangent) apodization profile.But in uniform apodization profile the bit error rate values areless for 200 Ghz channel spacing than 100 Ghz channel spacing which shows that there is nohigher channel isolation in uniform apodization profile due to 200 Ghz which is higherfrequency channel spacing than 100 Ghz it is same for Tanh (hyperbolic tangent) apodizationprofile i.e BER values are less in 200 Ghz channel spacing than 100 Ghz channel spacing andfor Gaussian apodization profile the BER values are less in 100 Ghz channel spacing than200 Ghz which is shown in table no.1 and figure no.3 channel but Gaussian apodizationprofiles BER values are higher in first simulation when single FBG filter is used andGaussian apodization profile BER values are less in second simulation when two FBG filtersare connected back to back each other [1].Table-1-Bit Error Rate for 10.52 Gbits/s of channel spacing 100 GHZ & 200 GHZFigure 3- Bit Error Rate for 10.52 Gbits/s for 100 GHZ and 200Ghz channel spacing forUniform apodizationChannelSpacingUniform Gaussian Tanh100 GHZ 3.40822e-010 7.90849e-005 4.49800e-010200 GHZ 3.10658e-10 8.10317e-005 4.11891e-010
  5. 5. International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 2, March – April (2013), © IAEME501Figure 4- 10.52 Gbit/s data rate WDM system with optical spectrum of second channel at100 GHZ channel spacing FBG filter with Gaussian apodization profile and the secondchannel eye diagram BER = 7.90849e-005The second simulation method is best than first simulation method because in secondsimulation method we used two FBG filter connected back to back each other. In which BERvalues are less for uniform apodization profile in first FBG filter as well as second FBG filterthan other two apodization profile i.e.uniform apodization profile in first and Gaussian andTanh (hyperbolic tangent) profile in second FBG filter for 2.5 Gbits/s.But the data rate is lowi.e 2.5 Gbits and eye diagram is not open properly.10.52 Gbits/s data rate has better resultsthan 2.5 Gbits/s which is shown in table no.2,table no.3 and figure no.5& figure no.6.[1,2].Table-2-Bit Error Rate for 2.5 Gbits/s of channel spacing 100 GHZ & 200 GHZTable-3-Bit Error Rate for 10.52 Gbits/s of channel spacing 100 GHZ & 200 GHZChannelSpacingUniform Gaussian Tanh100 GHZ 0.00454676 0.00479342 0.00455023200 GHZ 0.00460255 0.00496808 0.00460729ChannelSpacingUniform Gaussian Tanh100 GHZ 2.0395e-005 1.75349e-005 2.03193e-005200 GHZ 2.19816e-005 2.0468e-005 2.19594e-005
  6. 6. International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 2, March – April (2013), © IAEME502Figure 5-10.52 Gbit/s data rate WDM system with optical spectrum of second channel at100 GHZ channel spacing FBG filter with Uniform apodization profile and the secondchannel eye diagram BER = 2.0395e-005Figure 6-10.52 Gbit/s data rate WDM system with optical spectrum of second channel at100 GHZ channel spacing FBG filter with Gaussian apodization profile and the secondchannel eye diagram BER = 1.75349e-005We can observed from table no.2 &3 of second simulation in which two FBG filterconnected back to back to each other, the bit error rate values of Gaussian apodization profileare less for 10.52 Gbits data rate of 100 Ghz channel spacing than bit error rate values ofUniform apodization profile for 2.5 Gbits/s data rate of 100 Ghz channel spacing and BERvalues of second simulation for 10.52 Gbits/s of 100 Ghz channel spacing are also less thanBER values of first simulation in which single FBG filter is used of 10.52 Gbits/s for 100Ghz and 200 Ghz channel spacing.Figure 5 & figure 6 shows results for power vs wavelengthgraph and eye diagram of 10.52 Gbits/s for Uniform apodization profile and Gaussianapodization profile for 100 Ghz channel spacing respectively.From which we can observedthat there is higher channel isolation for Gaussain apodization profile with bit rate values1.75349e-005 as compared to uniform apodization profile with bit error rates values2.0395e-005.The Gaussian apodization profile of second simulation where two filterconnected back to back to each other has higher channel isolation with BER values 1.75349e-005 as compared to uniform apodization profile and Gaussian apodization profile with BERvalues 3.40822e-010,7.90849e-005 respectively for 100 Ghz channel spacing of firstsimulation where single FBG filter is used.[1,2].
  7. 7. International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 2, March – April (2013), © IAEME503IV. CONCLUSIONWe can conclude from simulation results of both simulation method ,the simulationmehod 2 is best than simulation method 1.The simulation method second has two FBG filterwhich are connected back to back to each other and in first FBG has common uniformapodization profile and in second FBG filter all three apodization profile like uniformapodization profile,Gaussian apodization profile and Tanh (hyperbolic Tangent) profile areused one after for channel spacing 200 Ghz, 100 Ghz, 50 Ghz, 25 Ghz for 2.5 Gbis/s and 10.52Gbits/s data rates and in first simulation method we used WDM transmitter and single FBG filter whichincludes all three apodization profile like apodization profile,Gaussian apodization profile andTanh (hyperbolic Tangent) profile are used one after for channel spacing 200 Ghz, 100 Ghz, 50Ghz, 25 Ghz for 2.5 Gbis/s and 10.52 Gbits/s data rates.We got high channel isolation in secondsimulation method for Gaussian apodization profile because of lower bit error rate values and higherside lobe reduction because of using two FBG filter connected back to back to each other for 10.52Gbits/s data rate of 100 Ghz channel spacing as compared to Uniform apodization profile & Gaussianapodization profile with higher bit error rates values of first simulation method for 10.52 Gbits/s datarate of 100 Ghz channel spacing.REFERENCES1] Manish Saxena, Dr.Anubuti Khare, Amit Mahire“High Channel Isolation Using Two FBGFilter Connected Back to Back For High Dense WDM System.” Published in “InternationalJournal of Electronics & Communication Technology” ISSN : 2230-7109 (Online) | ISSN :2230-9543 (Print), Vol. 4, Issue 1, Jan - March 2013[2] O. Ozoli , . Ivanovs Realization of ptimal FBG Band–Pass Filters for High SpeedDWDM Journal of Electronics and Electrical Engineering, 2009. No. 4(92) ISSN 1392 –1215[3] Agrawal G. Nonlinear Fiber Optics (Third Edition) //Academic Press. – 2001.[4] Pfennigbauer M., Winzer P. J. Choice of MUX/DEMUX filter characteristics forN R Z , R Z , and CSRZ DWDM systems Light wave Technology. – 2006. –No. 24(4), -P. 1689 – 1696[5] Phing H.S., Ali J., Rahman R.A. and Tahir B.A. Fiber Bragg grating modeling,simulation and characteristics with different grating length, Journal of FundamentalSciences– 2007. – No.3. – P. 167-175[6] Kashyap R. Fiber Bragg grating // Academic Press. – 1999.[7] Bobrovs V., Ivanovs G. Parameter Evaluation of a Dense Optical Network Electronicsand Electrical Engineering. –2006. – No.4 (25). – P. 33-37.[8] 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 in WDMObs 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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