Long Reach Coherent Optical OFDM System using Multiple Mid Link Spectral Inversion Modules
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2016 by IJETT Journal|
|Year of Publication : 2016|
|Authors : Harmanjot Singh, Sukhpal Singh
|DOI : 10.14445/22315381/IJETT-V38P280|
Harmanjot Singh, Sukhpal Singh"Long Reach Coherent Optical OFDM System using Multiple Mid Link Spectral Inversion Modules", International Journal of Engineering Trends and Technology (IJETT), V38(8),436-441 August 2016. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
CO-OFDM is a very attractive modulation and multiplexing technique that is used in wideband optical systems as well as optical wireless systems. In this paper; performance of utilizing multiple optical phase conjugate (OPC) modules in CO-OFDM system as a midlink spectrum inverter has been analyzed in order to improve the performance of system in long-haul fiber-optic channel. Firstly, performance of COOFDM system investigated at 30Gb/s, 50Gb/s and 100Gb/s which successfully transmitted over 1800Km, 1440Km and 1080 Km link length respectively without using any optical phase conjugation module. Further multiple OPC modules used in order to compensate effects of Kerr non linearities.8400Km of long distance transmission has achieved with acceptable BER limits by incorporating 6 OPC modules each after 1200Km at 30Gb/s. Results are analyzed in terms of OSNR, Q-factor for varied launched power and results revealed that system performs best at 12dB input power and effects of SPM decreased by using multiple OPC modules.
 W. Shieh, “OFDM for flexible high-speed optical
networks,” J. Lightwave Technol., vol. 29, no. 10, pp.
 P. J. Winzer and R. J. Essiambre, “Advanced optical modulation formats,” Proc. IEEE, vol. 94, pp. 952–985, 2006
 J. P. Gordon and L. F. Mollenauer, “Phase noise in photonic communications systems using linear amplifiers,” Opt. Lett., vol. 15, no. 23, pp. 1351–1353, 1990.
 L. B. Du, M. M. Morshed, and A. J. Lowery, “Fiber nonlinearity compensation for OFDM super-channels using optical phase conjugation,” Opt. Express, vol. 20, no. 18, pp. 19921–19927,2012.
 M. E. Mousa-Pasandi and D. V. Plant, “Zero-overhead phase noise compensation via decision-directed phase equalizer for coherent optical OFDM,” Opt. Express, vol. 18, no. 20, pp. 20651–20660, 2010
 A. Yariv, D. Fekete, and D. M. Pepper, “Compensation for channel dispersion by nonlinear optical phase conjugation,” Opt. Lett., vol. 4, pp. 52–54, 1979.
 V. Pechenkin and I. J. Fair, “Analysis of four-wave mixing suppression in fiber-optic OFDM transmission systems with an optical phase conjugation module,” J. Opt. Commun. Netw. vol. 2, no.9,pp.701–710,2010.
 V. Pechenkin and I. J. Fair, “On four-wave mixing suppression in dispersion-managed fiber-optic OFDM systems with an optical phase conjugation module,” J. Lightwave Technol., vol. 29., no. 11, pp. 1678–1691, 2011.
optical phase conjugation, OSNR, error vector magnitude, self phase modulation, BER.