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:
Jul. 01, 2014
Filed:
Aug. 05, 2011
Zhuhong Zhang, Ottawa, CA;
Chuandong LI, Ottawa, CA;
Fei Zhu, San Jose, CA (US);
Yusheng Bai, Los Altos Hills, CA (US);
Zhuhong Zhang, Ottawa, CA;
Chuandong Li, Ottawa, CA;
Fei Zhu, San Jose, CA (US);
Yusheng Bai, Los Altos Hills, CA (US);
Futurewei Technologies, Inc., Plano, TX (US);
Abstract
A digital apparatus comprising a fast Fourier transform (FFT) module configured to transform a time domain optical signal into a frequency domain optical signal, a circular shifter coupled to the FFT module and configured to provide coarse frequency offset compensation to the frequency domain optical signal based on an estimated frequency offset; and a frequency offset estimation module coupled to the circular shifter and configured to provide the estimated frequency offset based on a power spectrum of the frequency domain optical signal or a data block header autocorrelation of the time domain optical signal.