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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 27, Iss. 13 — Jul. 1, 2009
  • pp: 2552–2553

Addendum to Feedforward Carrier Recovery for Coherent Optical Communications

Ezra Ip and Joseph M. Kahn

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


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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

Citation
Ezra Ip and Joseph M. Kahn, "Addendum to Feedforward Carrier Recovery for Coherent Optical Communications," J. Lightwave Technol. 27, 2552-2553 (2009)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-27-13-2552

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