International Journal of Research in Engineering, Technology and Science, Volume VII, Special Issue, Feb 2017 www.ijrets.com, [email protected], ISSN 2454-1915 Tushar Kant Panda, Krishna Chandra Patra, Nalinikant Barapanda and Padmini Mishra 1 PERFORMANCE COMPARISON OF DISPERSION COMPENSATING FIBER IN 40 GBPS WDM NETWORK USING PRE, POST AND SYMMETRICAL COMPENSATION SCHEMES Mr.TusharKantPanda 1 , Dr. Krishna Chandra Patra 2 ,Dr.Nalinikant Barapanda 3 and Mrs. Padmini Mishra 4 1 Research scholar, Sambalpur University Institute of Information Technology, Sambalpur 2 Asst. Professor, Sambalpur University Institute of Information Technology, Sambalpur 2 Reader, Sambalpur University, Sambalpur 3 Asst. Professor, Gandhi Institute of Engineering and Technology, Gunupur Abstract-Fiber optics communication has become a widespread adopted method for data transmission. The miraculous idea of using light as carrier to carry the message across the distance allured a lot of researchers towards itself. The major advantage offered by the fiber optic communication is its high bandwidth. In order to make the optimum use of this bandwidth we must transmit many signals through single fiber. WDM Network permits multiple channels to be routed through single fiber at different wavelength. However it does face some challenges and Dispersion being the major limiting factor among all. Dispersion causes pulse distortion and spreading of pulses in time domain. In this paper, we have used the very basic technique of using dispersion compensating fibers (DCF) to compensate the positive dispersion in a WDM network. Three schemes of dispersion compensation (pre, post and symmetrical) with DCF are proposed in this paper by using Optisystem 7.0 simulator. The results obtained from the respective schemes are compared in terms of Q-factor, BER, Eye height and Threshold value and it is found that the symmetrical compensation method is superior to pre- and post-compensation methods. Thus by using these comparisons one can achieve a cost effective, propitious system with high spectral efficiency and good flexibility. Keywords –Dispersion compensating Fiber, Bit error rate (BER), Q-factor, Eye height, MZM (Mach Zender Modulator), Optisystem Software version 7.0. 1. INTRODUCTION From past few years, the number of internet users is increasing day by day, hence, the internet business is increasing too. Therefore, primary requirement of people are more capacity and better network system [1]. In order to get better and effective performance while transmitting the data from transmitter side to receiver side, WDM network is being used [2]. The key parameters which is responsible for effective performance in Wavelength Division Multiplexing (WDM) optical network is high data rate, high capacity and high bandwidth. Different signals are being used as input signal at transmitter side and are multiplexed using WDM network [3]. After multiplexing, signals are sent through a single fiber. While transmissionof signal, there is degradation in light intensity while travelling through fiber. Though WDM network is one of the effective techniques for data transmission, still it suffers from performance limiting factors like dispersion and nonlinear effects. Here dispersion is the main performance limiting factor which responsible for limiting the information capacity at high data rate [4]. In order to compensate dispersion, different dispersion compensation techniques are being used. Dispersion compensating fiber, fiber Bragg grating, electrical compensation method and optical phase conjugation are the effective dispersion compensation techniques which limit the performance limiting factor (dispersion). 2. DISPERSION The main performance limiting factor in the world of optical communication is dispersion [5]. When light pulses of different wavelength are transmitted through optical fiber, due to the variation in refractive index with wavelength, pulses travels with different speed. After travelling
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International Journal of Research in Engineering, Technology and Science, Volume VII,
SYMMETRICAL COMPENSATION SCHEMES Mr.TusharKantPanda1 , Dr. Krishna Chandra Patra2,Dr.Nalinikant Barapanda3 and Mrs.
Padmini Mishra4
1Research scholar, Sambalpur University Institute of Information Technology, Sambalpur 2Asst. Professor, Sambalpur University Institute of Information Technology, Sambalpur
2Reader, Sambalpur University, Sambalpur 3Asst. Professor, Gandhi Institute of Engineering and Technology, Gunupur
Abstract-Fiber optics communication has become a widespread adopted method for data transmission. The miraculous idea of using light as carrier to carry the message across the distance allured a lot of researchers towards itself. The major advantage offered by the fiber optic communication is its high bandwidth. In order to make the optimum use of this bandwidth we must transmit many signals through single fiber. WDM Network permits multiple channels to be routed through single fiber at different wavelength. However it does face some challenges and Dispersion being the major limiting factor among all. Dispersion causes pulse distortion and spreading of pulses in time domain. In this paper, we have used the very basic technique of using dispersion compensating fibers (DCF) to compensate the positive dispersion in a WDM network. Three schemes of dispersion compensation (pre, post and symmetrical) with DCF are proposed in this paper by using Optisystem 7.0 simulator. The results obtained from the respective schemes are compared in terms of Q-factor, BER, Eye height and Threshold value and it is found that the symmetrical compensation method is superior to pre- and post-compensation methods. Thus by using these comparisons one can achieve a cost effective, propitious system with high spectral efficiency and good flexibility. Keywords –Dispersion compensating Fiber, Bit error rate (BER), Q-factor, Eye height, MZM (Mach Zender Modulator), Optisystem Software version 7.0. 1. INTRODUCTION
From past few years, the number of internet users is
increasing day by day, hence, the internet business is
increasing too. Therefore, primary requirement of
people are more capacity and better network system
[1]. In order to get better and effective performance
while transmitting the data from transmitter side to
receiver side, WDM network is being used [2]. The key
parameters which is responsible for effective
performance in Wavelength Division Multiplexing
(WDM) optical network is high data rate, high capacity
and high bandwidth. Different signals are being used
as input signal at transmitter side and are multiplexed
using WDM network [3]. After multiplexing, signals
are sent through a single fiber. While transmissionof
signal, there is degradation in light intensity while
travelling through fiber. Though WDM network is one
of the effective techniques for data transmission, still it
suffers from performance limiting factors like
dispersion and nonlinear effects. Here dispersion is the
main performance limiting factor which responsible for
limiting the information capacity at high data rate [4].
In order to compensate dispersion, different dispersion
compensation techniques are being used. Dispersion
Table 2.3: Comparison of three dispersion compensation schemes:
Pre-compensati
on
Post-compensati
on
Symmetrical-
compensation
Average Q-factor
(dB) 11.521925 9.0804325 7.959815
Average BER
10488831572e-026
1.837630753e-016
9.49928761e-014
Average Eye
2.913e-005 2.723995e-
005 0.00550149
height
Average Threshold value
1.7346e-005 1.563695e-
005 0.005724132
5
6. CONCLUSION
For any system to work effectively it must have the
Q factor that determines the quality of service of that system
about 7dB and the next factor which is very crucial for the
system is it’s eye height value, the wider the eye opening the
better the system gets.
Comparing above obtained results we can very
well observe that symmetric compensation has the best eye
height and it also has satisfactory value for the Q factor and
hence it is the best technique compared to post and pre.
7. REFERECES:
[1] Mochida Y, Yamaguchi N, Ishikawa G, "Technology-
oriented review and vision of 40Gb/s-based optical transport
Networks", Journal of light-wave technology.PP. 2272-228,
12002, 20(12).
[2] Dispersion compensation in 40 gb/s wdm network using dispersion compensating fiber 1 mr. Gaurang.h.patel, 2prof. Rohit.b. Patel, 3 prof. Sweta.j.patel, journal of information, knowledge and research in electronics and communication engineering, issn: 0975 – 6779| nov 12 to oct 13 | volume – 02, issue - 02
[3] WDM-OTDM based spectral efficient hybridmultiplexing technique inherent with properties of bandwidth elasticity and scalability Gousiaa, G.M.Rathera, AjayK.Sharmab.ELSEVIERwww.elsevier.de/ijleo ,Received 5 August 2008; accepted 16 December 2008
[4] Zou X Y, Hayee M I, H wang S M, et al. Limitations in 10Gb/s WDM optical-fiber transmission when using a variety of fiber types to manage dispersion and nonlinearities[J]. Light wave Technol., PP: 1144-1152,June,1996
[5] WuQiang,Yu Chong Xiu, "Analysis on dispersion compensation with DCF", semiconductor optoelectronics,Vol.24 No.3 pp.186-196.June 2003
[6] Bo-Ning HU, Wang Jing, Wang Wei, Rui-Mei Zhao, Analysis on Dispersion Compensation with DCF based on Optisystem, 2ndInternational Conference on Industrial and Information Systems 2010, 40-43
[7] Jianjun Yu, Bojun Yang,"Dispersion-allacated soliton technology with long amplifier spacing and long distance," IEEEphotontechnollett, vol 9, pp. 952-954,No.7, 1997:
PERFORMANCE COMPARISON OF DISPERSION COMPENSATING FIBER IN 40 GBPS WDM
NETWORK USING PRE, POST AND SYMMETRICAL COMPENSATION SCHEMES
TusharKantPanda, Krishna Chandra Patra, Nalinikant Barapanda and Padmini Mishra 6
[8] Bo-ningHU, Wang Jing, Wang Wei and Rui-mei Zhao1, “Analysis on Dispersion Compensation with DCF based on Optisystem”, IEEE 2nd International Conference on Industrial and Information Systems, 2010
[9] ZhouZhiQiang, TangYuLiang, "Optimmum schemes of dispersion compensation transmission systems using
[10] R.S.Kaler, Ajay K Sharma, and T.S.Kamal, Comparison of pre-,post- and symmetrical- dispersion compensation schemes for 10Gb/s NRZ links using standard and dispersion compensated fibers, Elsevier Optics Communication 209 2002, 107-123