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:
Apr. 30, 2013
Filed:
Dec. 23, 2010
Huiping LI, Shanghai, CN;
Xiaolin Chen, Shanghai, CN;
Fan Chen, Shanghai, CN;
Fahua Lan, Shanghai, CN;
Dapeng Kevin Zhang, Fremont, CA (US);
Huiping Li, Shanghai, CN;
Xiaolin Chen, Shanghai, CN;
Fan Chen, Shanghai, CN;
Fahua Lan, Shanghai, CN;
Dapeng Kevin Zhang, Fremont, CA (US);
Finisar Corporation, Sunnyvale, CA (US);
Abstract
A phase shift keyed demodulator includes first and second beam splitters, a first optical path, a second optical path, and a wavelength tuner. The first beam splitter splits an input signal into first and second output signals. The second beam splitter splits each first and second output signal into a transmitted signal and a reflected signal. The first optical path includes an optical path of each transmitted signal from a beam splitting surface to a reflector and back to the beam splitting surface. The second optical path includes an optical path of each reflected signal from the beam splitting surface to a mirror surface and back to the beam splitting surface. A path difference introduces a delay between the transmitted signal and the reflected signal. The wavelength tuner tunes the demodulator to a predetermined central wavelength and introduces a phase shift between first and second transmitted signals.