Characteristics of Compensation for Distorted WDM Channel with Inter-channel Interference due to Four-Wave Mixing

4-광파 혼합에 의한 채널 간섭이 존재하는 왜곡된 WDM 채널의 보상 특성

  • Published : 2004.10.01

Abstract

In this paper, the characteristics of compensation for interferenced mid-channel signal by neighbor channels through four-wave mixing (FWM) process dominantly is investigated as a function of channel input power, fiber dispersion coefficient and transmission length in WDM system with equally spaced channels. The compensation method used in this research is mid-span spectral inversion(MSSI). The highly nonlinear dispersion shifted fiber (HNL-DSF) is used as a nonlinear medium of optical phase conjugator (OPC) in order to compensate wideband WDM signals. First, we confirmed that the effect of FWM on channel interference is gradually reduced as fiber dispersion coefficient becomes gradually smaller, independent of signal format. And, we confirmed that RZ is better than NRZ as a modulation format for transmitting high power channel with allowable reception quality. But realization of flexible WDM systems regardless of channel number variation is possible by using NRZ rather than RZ format.

References

  1. Y. Yano, et al., '2.6 Terabit/s WDM transmission experiment using optical duobinary coding', Proceeding of ECOC '96, Vol. 5, 1996
  2. E. Desurvire, J. R. Simpson and P. C. Becker, 'High-gain erbium doped travelingwave fiber amplifier', Opt. Lett., Vol. 12, pp. 888-890, 1987 https://doi.org/10.1364/OL.12.000888
  3. N. Shibata, K. Nosu, K. Iwashita and Y. Azuma, 'Transmission limitations due to fiber nonlinearities in optical FDM systems', IEEE J Select. Areas in Cornrn., Vol. 8, No. 6, pp. 1068 -1077, 1990 https://doi.org/10.1109/49.57810
  4. A. R. Chraplyvy, 'Limitations on lightwave communications imposed by optical-fiber nonlinearities', J. Lightwave Technol., Vol. LT-8, No. 10, pp. 1548-1557, 1990 https://doi.org/10.1109/50.59195
  5. 이성렬, 임황빈, '채널 간격이 일정한 WDM시스템에서의 MID-Span Spectral Inversion을 이용한 보상 특성', 한국전자파학회논문지, 14권 8호, pp. 845-854, 2004
  6. G. P. Agrawal, 'Nonlinear Fiber Optics', Academic Press, 1989
  7. G. P. Agrawal, 'Fiber-optic communication systems', John Wiley & Sons, Inc., 1992
  8. S. Kawai and K. Iwatsuki, 'System design of filter-guided soliton transmission considering amplitude noise and timing jitter', J. Lightwave Technol., Vol. LT-16, No. 12, pp. 2347-2354, 1998
  9. 이성렬, '200 Gbps WDM 시스템에서 MidSpan Spectral Inversion 기법을 이용한 채널 왜곡의 보상특성', 한국전자파학회논문지, 14권 8호, pp. 845-854, 2004
  10. K. Inoue, 'Four-wave mixing in an optical fiber in the zero-dispersion wavelength region', J. Lightwave Technol., Vol. LT-I0, No. 11, pp. 1553 -1561, 1992
  11. S. Song, 'The number of four-wave mixing (FWM) waves in WDM systems and its applications', The 14th Annual Meeting of the IEEE, Vol. 1, Lasers and Electro-Optics Society 2001, 12-13 Nov. 2001
  12. 이성렬, '320 Gbps WDM 전송에서의 NRZ 형식과 RZ 형식에 따른 채널 왜곡의 보상 특성', 한국전자파학회논문지, 14권 11호, pp. 1184-1190, 2003