Optical coherent receiver, frequency offset estimating...

Details Optical coherent receiver, frequency offset estimating... Optical coherent receiver, frequency offset estimating...

2008-10-20

2011-12-13

Vanderpuye, Kenneth N (Department: 2613)

Optical communications

Receiver

Including postcompensation

C398S202000, C398S203000, C398S208000

Reexamination Certificate

active

08078066

ABSTRACT:
The present invention discloses an optical coherent receiver, and a frequency offset estimating apparatus and a frequency offset estimating method for use in the optical coherent receiver. The optical coherent receiver includes a front end processing section for changing an optical signal into a base band digital electric signal. The frequency offset estimating apparatus comprises a phase offset calculating section, for calculating a phase offset in said base band digital electric signal; a phase offset change calculating section, for calculating a change of said phase offset, namely a phase offset change, in accordance with the phase offset calculated by said phase offset calculating section; an ambiguity deciding section, for deciding whether there is ambiguity in said phase offset change calculated by said phase offset change calculating section, and outputting the phase offset change having no ambiguity; and a loop filtering section, for acquiring a weighted average of the phase offset change outputted by said ambiguity deciding section.

REFERENCES:
patent: 7894728 (2011-02-01), Sun et al.
patent: 7899340 (2011-03-01), Bontu et al.
patent: 2006/0245766 (2006-11-01), Taylor
patent: 2007/0036555 (2007-02-01), Chen et al.
patent: 2007/0206963 (2007-09-01), Koc

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