Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Optimal Position of Optical Phase Conjugator for Compensation of Distorted WDM Signals with Initial Frequency Chirp

  • Lee Seong-Real (Div. of Marine Electro. and Comm. Eng. Mokpo National Maritime University) ;
  • Choi Byung-Ha (Div. of Marine Electro. and Comm. Eng., Mokpo National Maritime University) ;
  • Chung Myung-Rae (Div. of Marine Electro. and Comm. Eng., Mokpo National Maritime University)
  • Published : 2005.03.01
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Abstract

In this paper, the optimal position of optical phase conjugator(OPC) excellently compensating distorted WDM channels with initial frequency chirp due to both chromatic dispersion and self phase modulation(SPM) is numerically investigated. Highly-nonlinear dispersion shifted fiber(HNL-DSF) is used as a nonlinear medium of OPC in order to widely compensate WDM signal band. It is confirmed that if the OPC position was shifted from mid-way of total transmission length dependence on the initial frequency chirp as well as modulation format and fiber dispersion coefficient, it is possible to cancel the performance degradation owing to the initial frequency chirp. Using proposed configuration, it is possible to remove all in-line dispersion compensator, reducing span losses and system costs in the long-haul broadband WDM systems.

Keywords

References

  1. N. Shibata, K. Nosu, K. Iwashita, and Y. Azuma, 'Transmission limitations due to fiber nonlinearities in optical FDM systems', IEEE J. Select. Areas in Comm., vol. 8, no. 6, pp. 1068-1077, 1990 https://doi.org/10.1109/49.57810
  2. 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 https://doi.org/10.1364/OL.4.000052
  3. S. Watanabe et al., 'Generation of optical phaseconjugate waves and compensation for pulse shape distortion in a single-mode fiber', J. Lightwave Technol., vol. 12, no. 12, pp. 2139-2145, 1994 https://doi.org/10.1109/50.350616
  4. W. Pieper et al., 'Nonlinearity-insensitive standard-fiber transmission based on optical-phase conjugation in a semiconductor-laser amplifier', Electron. Lett., vol. 30, pp. 724-726, 1994 https://doi.org/10.1049/el:19940494
  5. S. Watanabe, M. Shirasaki, 'Exact compensation for both chromatic dispersion and Kerr effect in a transmission fiber using optical phase conjugation', J. Lightwave Technol., vol. 14, no. 3, pp. 243-248, 1996 https://doi.org/10.1109/50.485581
  6. I. Brener et al., 'Cancellation of all Kerr nonlinearities in long fiber spans using a $LiNbO_3$ phase conjugator and Raman amplification', in Optical Fiber Comm. (OFC) Conf. 2000, pp. 266-268
  7. G. P. Agrawal, N. K. Dutta, Semiconductor Lasers, Ch. 6, van Nostrand-Reinhold Press, 1993
  8. Seong-Real Lee, Sung-Eon Cho, 'The compensation characteristics of WDM channel distortion dependence on NRZ format and RZ format', The Journal of Korea Electromag. Eng. Soc. (Korean), vol. 14, no. 11, pp. 1184-1190, 2003
  9. G. P. Agrawal, Nonlinear Fiber Optics, Academic Press, 2001
  10. F. Forghieri, R. W. Tkach, and A. R. Chraplyvy, 'WDM systems with unequally spaced channels', J. Lightwave Technol., vol. 13, no. 5, pp. 889-897, 1995 https://doi.org/10.1109/50.387806
  11. F. Koyama, K. Iga, 'Frequency chirping in external modulators', J. Lightwave Technol., vol. 6, no. 1, pp. 87-92, 1988 https://doi.org/10.1109/50.3969
  12. G. P. Agrawal, Fiber-Optic Communication Systems, John Wiley & Sons, Inc., 2002
  13. K. Inoue, 'Four-wave mixing in an optical fiber in the zero-dispersion wavelength region', J. Lightwave Technol., vol. 10, no. 11, pp. 1553-1561, 1992 https://doi.org/10.1109/50.184893
  14. Seong-Real Lee, E. S. Jung, S. E. Cho, and Y. H. Lee, 'Investigation of pump light power of wideband optical phase conjugator using highly nonlinear dispersion shifted fiber in WDM systems with mid-span spectral inversion', submitted to ETRI Journal
  15. Seong-Real Lee, Hwang-Bin Lim, 'Compensation characteristics dependence on the position of optical phase conjugator in 320 Gbps WDM systems', The Journal of Korea Electromag. Eng. Soc., vol. 4, no. 4, pp. 1184-1190, 2004
  16. C. Lorattanasane, K. Kikuchi, 'Design theory of long-distance optical transmission systems using midway optical phase conjugation', J. Lightwave Technol., vol. 15, no. 6, pp. 948-955, 1997 https://doi.org/10.1109/50.588664