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Addendum to “Feedforward Carrier Recovery for Coherent Optical Communications”

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2 Author(s)
Ip, E. ; Dept. of Electr. Eng., Stanford Univ., Stanford, CA, USA ; Kahn, J.M.

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.

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Lightwave Technology, Journal of  (Volume:27 ,  Issue: 13 )