International Journal of Advanced Research in Computer Science and Software Engineering

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1 ISSN: X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: Performance Analysis of WDM/SCM System Using EDFA Mukesh Kumar 1, Sandeep Singh 2, Jay Singh 3, Rohini Saxena 4 1,4 Assistant professor 2,3 PG Student ECE, SHIATS-DU Abstract The radio-over-fiber (RoF) system is one of the potential schemes for the future broadband wireless communication systems such as mobile communications, hotspots and suburban areas. In this paper, we present 16 channels of RF carrier modulation of the Sub Carrier Multiplexing (SCM), which then integrated, with Wavelength Division Multiplexing (WDM) for the Radio over Fibre Link. The integration of the two systems is responding to the demands for high data rate applications and reasonable mobility for broadband communication. The work also investigates the performance of EDFA for the optical fiber length up to 100 km. The EDFA introduced as the optical amplifier in the designed system model to encounter the effects of attenuation, distortion and Rayleigh scattering. The deploying of RF carrier performs by double side band and single side band of the SCM for bandwidth utilization shown to be much better than conventional optical WDM. However, by applying EDFA with the length varies from 0m 5m, the performance show that total power transmission has magnifying the optical signal significantly. The simulation result has shown that pre-amplifier EDFA in 100km of SCM/WDM RoF system significantly boost the performance of optical signal strength over the link. The power received increased up to an extent of 50%. The Q-Factor and BER significantly increased. Keywords WDM, SCM, EDFA, BER, Q-Factor I-INTRODUCTION Base Station Controller s (BSCs) or Base Transceiver The increases of bandwidth demand are linear with the System (BTS). Radio supply of networked services in many cellular operators. over fiber techniques offered to optimize the limitation The network are setup to provide the user the services that range and bandwidth provided. In order to overcome the are requires large bandwidth in the traffic, the services losses and attenuation of the traveled signal, we introduce such as video streaming, data communication, push , Erbium Doped Fiber Amplifier (EDFA) in SCM/WDM teleconference, mobile banking, etc. Therefore, the needs ROF system for over 150km 200km of optical fiber link. of broadband consumption of a user are increases. In order The other problem entails inefficient spectral utilization to supply the needs of bandwidth, many researchers when using the standard channel spacing between WDM currently actively investigate and focuses on three main signals (spacing higher than twice the highest modulating components; spectrum allocation of the frequency band, frequency). There would be a large portion of unused efficiency and to increase the capacity of the cell. In this spectrum between each wavelength and the data signal that work we propose Sub-Carrier Multiplexing (SCM) that this wavelength carries, because the radio carrier is much complemented with Wavelength Division Multiplexing higher than the bandwidth occupied by the transmitted (WDM) to be introduced for the ROF. Thus, the data. In order to improve the spectral efficiency of such a combinations of SCM/WDM expected to supply the ROF system, a fairly new channel spacing technique called demand of bandwidth increases for the cellular Wavelength Interleaving (WI) has been proposed In communication. Future ROF systems could be the answer systems employing WI the channel spacing is reduced to to many urgent needs of the telecommunication networks, values that are less than twice the highest modulating as they could provide the necessary bandwidth for the frequency. transmission of broadband data to end-users. These Optical subcarrier multiplexing (SCM) is a scheme systems are likely to employ two very efficient where multiple signals are multiplexed in the multiplexing techniques namely Sub-Carrier Multiplexing radiofrequency (RF) domain and transmitted by a single (SCM) and Wavelength Division Multiplexing (WDM) wavelength. A significant advantage of SCM is that.this would allow many Base Stations (BS) in the system microwave devices are more mature than optical devices; to be fed using a single fiber. Each BS would be assigned the stability of a microwave oscillator and the frequency its own wavelength and signals sent to different users selectivity of a microwave filter are much better than their serviced by a particular BS would be transmitted on that optical counterparts. In addition, the low phase noise of RF wavelength by means of SCM. oscillators makes coherent detection in the RF domain The shortcoming of cell distribution in cellular easier than optical coherent detection, and advanced communication is limitation in bandwidth, range and modulation formats can be applied easily. A popular spectrum allocation in order to maintain high quality of application of SCM technology in fiber optic systems is delivered signal among Mobile Switching Centre (MSC) to analog cable television (CATV) distribution. Because of the simple and low-cost implementation, SCM has also 2012, IJARCSSE All Rights Reserved Page 112

2 been proposed to transmit multichannel digital optical signals using direct detection for local area optical networks. II.SCM/WDM SYSTEM FOR ROF SYSTEM MODEL The system architecture comprises of 4 block of RF module that generate of 4 Binary Phase Shift Keying (BPSK) in different frequency channel which is the width among the channels is 1.8 GHz In the SCM/WDM, the CW Laser and MZM Modulator carried the RF modulated data in 1550 nm single wavelength. For this experiment, we take four sample of WDM channel carried digital data generates by Pseudo Random Bit Sequence (PRBS). Each of the data will be modulated by MZM modulator with varies number of subcarrier which was in gigahertz. The composite electrical signal that has generated by the electrical transmitter that was amplified to10 db by an electrical amplifier and transform to optical domain through external optical modulator, MZM and CW laser applied as the optical source. The Wavelength Division Multiplexing (WDM) was setup for multiplexing a single wavelength in order to transmit through SMF optical link. The WDM was installed to multiplexing optical signal carrier to the link; the basic operation of the WDM is several base band-modulated channels are transmitted along a single fiber but with each channel located at a different wavelength. In the optical link distance varies between 10 km up to 100 km for long distance communication it s refers to the low cost distance and resources efficient. The optical amplifier, EDFA was utilized in this design to amplified signal power with the fiber length are varied between 2 m up to 5 m. The EDFA is a length of glass fiber that has doped with the rare-earth metal Erbium ions. These ions act as an active medium with the potential to experience inversion of carriers and emit spontaneous and stimulated emission light near a desirable signal wavelength. The pump is typically another light source whose wavelength is preferentially absorbed by the ions, 0.98 or 1.48 mm for EDFA. The pump and signal (1.55 mm) must combined, typically by a wavelength-selective coupler (WDM), and may co- or counter-propagate with respect to each other inside the doped length of fiber. Therefore, the light is absorbed by the doped fiber at a certain pump wavelength and then produces gain for a signal at a different wavelength. Since the transmission and the active medium are both fiber based, the insertion losses are minimal. The propose SCM/WDM system was model and simulate to verify design using a commercial optical system simulator by Optiwave. After transmitted through a high-bandwidth optical fiber, the combined optical signals must demultiplexed at the receiving end by distributing the total optical power to each output port and then requiring that each receiver selectively recover only one wavelength by using a tunable optical filter. At the receiver, the received optical signal will be demultiplex by WDM Demux and converts into electrical signal by a high speed PIN photo detector. In this works an ideal WDM Demux was installed as function as optical signal demultiplexe as shown in the fig 2 and 3. It is works as optical filtering that compress, split, and filtering desire optical signals. The desired received signals are then selected through a Band Pass Rectangle filter, which split into individual SCM channel frequency. One of the main parameter that is in the top priority to sustain system quality is the photo detector sensitivity, which determines the minimum light power, could be detected by the photo detector. This parameter determines the length of a fiber-optic link imposed by a power limitation. Figure 2. Proposed simulation setup for WDM with EDFA Figure. 3 Proposed simulation setup for WDM The more sensitive the photodiode, the longer the link can afford. Figure 2 and 3 shows the simulation setup of the proposed WDM system with and respectively. Figure. 1 The SCM/WDM RoF with EDFA Communication Link System 2012, IJARCSSE All Rights Reserved Page 113

3 III. RESULT AND ANALYSIS A. Analysis of the proposed system on the basis of eye diagram Form the figure 6 we can observe that we are getting good BER for 10 Km by using EDFA. The minimum BER we are getting is in the range of 10-7 and a quality factor increased to 4.9. Jitter is 0ns and distortion due to the BER is negligible. From the figure 7 we can observe that by using EDFA the BER is improved as we compare it from fig 4.4. The BER is improved to 10-3 and the quality of the signal improved from 0 to Figure 4 EYE diagram for system for 10 km Form the figure 4 we can observe that we are getting good BER for 10 Km. the minimum BER we are getting is in the range of 10-7 and a quality factor of 4.8. Jitter is 0ns and distortion due to the BER is negligible. Fig 7 EYE diagram for system for 100 Km with EDFA Figure 5 EYE diagram for system for 100 km Form the figure 5 we can observe as the distance increases from 10 to 100 Km the BER become worst for the system as we are getting BER increased form 10-7 to 1 and Quality reduces to zero. B. Comparison on the basis of performance using EDFA In the optical communication link, power is one of the components that used to transmit optical signal. Through the fibre link, naturally power drops due to attenuation, distortion and losses. In this work the propose system was successfully model and simulated, the results will illustrate the effect of using EDFA or. The distance link was setup for km to evaluate how total power, Bit Error Rate (BER), Quality factor (Q-factor) and EDFA have an effect to the link. In this paper we initiate the power is 0 dbm for 100km. Figure 8 illustrates the performance of total power to the length with and. Figure 8 shows that EDFA can influence the total power to the link distance 100 km, where significantly increases -25 to -50 dbm. Fig 6 EYE diagram for system for 10 Km with EDFA Figure. 8 The power vs. distance for 100 Km for WDM/SCM with and It is mean that the power reduced or attenuated over the link. EDFA is able to boost the total power 2012, IJARCSSE All Rights Reserved Page 114

4 that travel over the SMF fibre optic in the SCM/WDM RoF. However, EDFA model in the SCM/WDM RoF can proposed for optical cellular and distance extended up to 200km. Therefore, the EDFA system model works to augmented total powers that travel over the fibre link and significantly increases is much better that. Finally, EDFA able to support the SCM/WDM RoF system model to maintain the bandwidth provide optical cellular communication link. For better result in a future works, the values of EDFA applied varying the range of 10m 20m to obtain the better gain of optical signals. EDFA can also be able to improve the BER of the data. Therefore EDFA system model works to improve the Bit Error rate (BER) of the data transmitted through the WDM/SCM communication link. IV-CONCLUSION Optical cellular communication system require signal guarantee that capable to overcome distortion and attenuation in the communication link. The expected system has shown can reduce and minimize the losses until the total power maintained. Hence, the signal quality improved by utilizing EDFA for km of SMF for the SCM/WDM RoF with significantly increases the total power and minimize the losses. The system simulation with 0m 5m length EDFA has verify that technique capable to boost up to power quality of the optical signal. Also it was found that by using EDFA the BER is reduced from 1 to 10-3 and the q-factor increases from 0 to EDFA proficient to maintain of the signal power augmented more than 50 % of the initiate power. The total power received with the help of EDFA increased up to 50 db. Figure. 9 Q-Factor vs. distance for 100 Km for WDM/SCM with and Figure 9 illustrates the performance of Quality factor to the length with and. Figure 9 shows that EDFA can influence the Quality of the signal to the link distance 100 km, where significantly increases to three times. It is mean that the quality of the signal decreased over the link. EDFA is able to improve the quality of the signal that travel over the SMF fibre optic in the SCM/WDM RoF. Therefore, the EDFA system model works to improve the quality of the signal also that travel over the fibre link and significantly increases is much better that. REFERENCES [1] Marwanto et al. (2008) The SCM/WDM System Model for radio over Fiber Communication Link, 2008 IEEE International RF and Microwave Conference December 2-4, 2008, Kuala Lumpur, Malaysia pp [2] Marwanto et al. (2008) Broadband Radio over Fiber communication Employing SCM/WDM System, International Conference on ICT Technology, April 2008,Semarang, Indonesia. [3] Mohamed N. et al.(2008) Review on System Architectures fo the Millimeter- Wave Generation Techniques for RoF Communication Link, IEEE International RF and Microwave Conference December 2-4, 2008, Kuala Lumpur, Malaysia pp [4] Harun H. et al.(2007) Optical Frontend Receiver Design for Radio over Fiber System, 5th Student Conference on Research and Development (SCOReD) 2007, [5] Noël L. et al.(1997), Novel techniques for highcapacity 60 GHz fiber-radio transmission systems, IEEE Trans. MTT, v45 n8, p [6] Wake D. et al. (2004) Radio Over Fiber For Mobile Communications, Microwave Photonics 2004, pp , 4 6 Oct. Figure. 10 The BER vs. distance for 100 Km for WDM/SCM with and Figure 10 illustrates the performance of the BER to the length with and without edfa. Figure 10 shows that the Edfa can influence the bit error rate of the data transmitted through the WDM/SCM communication link.fi shows that the ber increased to a value 10-3 times with edfa. So, [7] O'Reilly J.J.et al.(1995) Optical generation of very narrow linewidth millimeter wave signals, Electron. Lett., vol. 28, pp [8] Novak D. et al.(1995) Signal generation using pulsed semiconductor lasers for application in millimeter-wave wireless links, IEEE Trans. 2012, IJARCSSE All Rights Reserved Page 115

5 Microwave Theory Tech.,vol. 43, pp [9] Hui R. et al. (2002) Subcarrier Multiplexing for High-Speed Optical Transmission, Journal of Lightwave Technology, Vol. 20, NO. 3. [10] Loyez C.et al.(2005) Subcarrier radio signal transmission over multimode fibre for 60 GHz WLAN using a phase noise cancellation technique Electronics Letters 20th Vol. 41 No. 2 [11] Kitayama K. et al.(1996) 60 GHz millimeterwave generation and transport using stabilized mode-locked laser diode with optical frequency DEMUX switch, IEEE Globecom'96, vol. 3, pp , IJARCSSE All Rights Reserved Page 116

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