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:
Nov. 12, 2013
Filed:
Jun. 29, 2011
Hitoshi Kiuchi, Tokyo, JP;
Hitoshi Kiuchi, Tokyo, JP;
National Institutes of Natural Sciences, Tokyo, JP;
Abstract
An optical transmission system includes: a two-lightwave generator for generating optical signals having wavelengths λand λfrom laser light; a photodetector for detecting a microwave signal Mfrom two optical signals distributed by an optical coupler; an optical modulator for frequency-shifting the two optical signals; a Faraday reflector for reflecting the two optical signals; an optical coupler for mixing the two optical signals that have been reflected by the Faraday reflector, frequency-shifted again, transmitted by an optical fiber, and guided by a polarization beam splitter, with two optical signals distributed by an optical coupler; an optical demultiplexer for wavelength-dividing four mixed optical signals into optical signals having the wavelengths λand λ; photodetectors for detecting respective beat signals of the wavelength-divided optical signals having λand λ; and a phase difference detector for detecting a phase difference between the beat signals of the optical signals having λand λ