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:
Jun. 01, 2004
Filed:
Sep. 11, 2001
Shiro Shichijyo, Sodegaura, JP;
Kazuhiro Yamada, Sodegaura, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
A wavelength conversion apparatus includes: multiplexer that multiplexes pumped light and signal light; wavelength conversion element that wavelength-converts linearly polarized light components in x direction with respect to the pumped light and the signal light, and generates output light polarized in x direction; and light circulator that allows the light of the multiplexer to be output to the wavelength conversion element and allow the light from the wavelength conversion element to be output to the port; reflecting mirror; and Faraday rotator that makes a polarization direction difference of 90 degrees between light traveling from the wavelength conversion element to the reflecting mirror and light reflected at the reflecting mirror so as to return to the wavelength conversion element. Intensity IL of the output light does not depend on the incident polarization angle &phgr; of the signal light &lgr;s and is constant.