The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2015
Filed:
May. 24, 2012
Chuandong LI, Ottawa, CA;
Yuanjie Chen, Saratoga, CA (US);
Zhuhong Zhang, Ottawa, CA;
Yi Cai, Jackson, NJ (US);
Fei Zhu, San Jose, CA (US);
Chuandong Li, Ottawa, CA;
Yuanjie Chen, Saratoga, CA (US);
Zhuhong Zhang, Ottawa, CA;
Yi Cai, Jackson, NJ (US);
Fei Zhu, San Jose, CA (US);
Futurewei Technologies, Inc., Plano, TX (US);
Abstract
An optical signal receiver tracks local oscillator frequency offset (LOFO) and compensates for the phase distortion introduced in the received signals as a result of utilizing the local oscillator within a coherent detection scheme. This phase distortion is basically a constant phase rotation caused by the LOFO and implementation of the receiver using coherent detection and a digital interferometer instead of a conventional (yet complex) carrier phase estimation or recovery scheme. With an optical receiver implemented in this manner, the requirement of using a precise local oscillator laser with low frequency offset is less important.