Title:
光コヒーレント受信機、周波数オフセット推定装置、及び光コヒーレント受信機の方法
Document Type and Number:
Japanese Patent JP5391660
Kind Code:
B2
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.
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Inventors:
Rayleigh
Genin Tao
Hisao Nakajima
Genin Tao
Hisao Nakajima
Application Number:
JP2008294889A
Publication Date:
January 15, 2014
Filing Date:
November 18, 2008
Export Citation:
Assignee:
富士通株式会社
International Classes:
H04B10/516; H04B10/61; G02F2/00; H04B10/524; H04B10/556
Domestic Patent References:
| JP2000134159A | ||||
| JP10215290A |
Other References:
Leonid G. Kazovsky 他,「Homodyne Phase-Shift-Keying Systems: Past Challenges and Future Opportunities」,Journal of Lightwave Technology,2006年12月,Vol.24 No.12,p.4876 - 4884
Attorney, Agent or Firm:
Tadahiko Ito
Akinori Yamaguchi
Akinori Yamaguchi