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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 16, Iss. 11 — Nov. 1, 1998
  • pp: 1973–

Improved Receivers for Coherent FSK Systems

Hongsheng Gao, Peter J. Smith, and Mansoor Shafi

Journal of Lightwave Technology, Vol. 16, Issue 11, pp. 1973- (1998)

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There has been considerable interest over the last decade in the detection of digital coherent lightwave signals corrupted by phase noise. However, the majority of the work has been in the performance analysis of various modulation schemes. In addition, the receivers studied have, in general, been zero-phase noise optimal or ad hoc modifications of these. In this paper, we consider the design problem of constructing optimal receivers for systems using frequency shift keying (FSK). Using the innovations approach, we show the format of the optimal receiver and use a small phase noise approximation to derive suboptimal receivers. Also, receivers based on optimum linear filters are also derived. Both receivers are analyzed by simulation and performance improvements over the standard receivers are shown. Furthermore, the receivers developed can equally well be used to further improve the performance of other detection schemes such as postdetection filtering and time diversity. The methodology is also used to derive equivalent receivers for systems using on-off keying (OOK).


Hongsheng Gao, Peter J. Smith, and Mansoor Shafi, "Improved Receivers for Coherent FSK Systems," J. Lightwave Technol. 16, 1973- (1998)

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  1. I. Garrett, K. J. Bond, J. B. Waite, D. S. L. Lettis, and G. Jacobsen, "Impact of phase noise in weakly coherent systems: A new and accurate approach," J. Lightwave Technol., vol. 8, pp. 329-337, Mar. 1990.
  2. G. Jacobsen and I. Garrett, "The effect of crosstalk and phase noise in multichannel coherent optical ASK systems," J. Lightwave Technol., vol. 9, pp. 1006-1018, 1991.
  3. C. P. Kaiser, P. J. Smith, and M. Shafi, "An improved optical heterodyne DPSK receiver to combat laser phase noise," J. Lightwave Technol., vol. 13, pp. 525-533, Mar. 1995.
  4. G. L. Pierobon and L. Tomba, "Moment characterization of phase noise in coherent optical systems," J. Lightwave Technol., vol. 9, pp. 996-1005, Aug. 1991.
  5. C. P. Kaiser, M. Shafi, and P. J. Smith, "Analysis methods for optical heterodyne DPSK receivers corrupted by laser phase noise," J. Lightwave Technol., vol. 11, pp. 1820-1830, Nov. 1993.

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