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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 27,
  • Issue 13,
  • pp. 2552-2553
  • (2009)

Addendum to Feedforward Carrier Recovery for Coherent Optical Communications

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Abstract

In a previous paper , we noted when the transmitted signal constellations has rotational symmetry, laser phase noise can be mitigated using non-data-aided (NDA) feedforward (FF) carrier recovery. The structures of a FF carrier recovery unit and a NDA soft-decision phase estimator were shown in Fig. 3 and 4(a), respectively. We have found that in an NDA FF carrier recovery unit, the order of the linear filter and phase estimator can be exchanged in a manner not possible with a decision-directed (DD) FF carrier recovery unit. We show that this alternative NDA (ANDA) FF carrier recovery unit exhibits better immunity to cycle slips compared to standard NDA.

© 2009 IEEE

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