The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A theoretical study on the demodulation for coherent optical communication system using DPSK

코히어런트 광통신시스템의 DPSK 복조에 관한 이론적 고찰

  • 지인호 (홍익대학교 전자전기컴퓨터공학부) ;
  • 장홍식 (홍익대학교 전자전산공학과)
  • Published : 1997.05.01
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Abstract

It is known that the Differential Phase Shift Keying (DPSK) modulation scheme in the coherent optical communication system is suitable for design of long-distance transmission system because its receiver performance is 3-5dB better than ASK and FSK. In this paper, we descrive a fundamental understanding of the effects of laser phase noise on the performance of coherent lighwave communication systems. Formulas are derived for the bit error rate in homodyne and heterodyne DPSK. Based on detailed mathematical analysis and estimates, we explain the following finding. DPSK can operates at rates only 300 times greater than the laser linewidth.

Keywords

References

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