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:
Oct. 19, 2004
Filed:
Jun. 06, 2003
Masaki Asobe, Isehara, JP;
Osamu Tadanaga, Zama, JP;
Hiroshi Miyazawa, Isehara, JP;
Yoshiki Nishida, Mito, JP;
Hiroyuki Suzuki, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A wavelength converter has a phase modulated periodically modulated structure, where a nonlinear optical coefficient is periodically modulated at a fundamental period &Lgr; and the phase of the modulation varies nearly continuously, and the phase variation of the modulation unit structure is repeated at a period &Lgr; (>&Lgr; ). A conversion efficiency is made maximum when a phase mismatch amount &Dgr;&bgr; equals 2&pgr;/&Lgr; ±2&pgr;i/&Lgr; (i=0, 1, . . . , n, where n is a positive integer), 2&pgr;/&Lgr; ±2&pgr;(2i+1)/&Lgr; (i=0, 1, . . . , n), or 2&pgr;/&Lgr; +2&pgr;i/&Lgr; (i=m, m+1, . . . . n, where m and n are positive or negative integers satisfying |m|≠|n|), thereby providing a wavelength converter and wavelength converting apparatus that can be designed to be able to cope with a desired number of pump wavelengths, prevent the reduction in the conversion efficiency, and be configured easily using a practical size of a nonlinear optical material.