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. 27, 2004
Filed:
Jun. 15, 2001
Applicant:
Inventors:
Noboru Edagawa, Kamifukuoka, JP;
Masatoshi Suzuki, Kamifukuoka, JP;
Assignee:
KDD Submarine Cable Systems Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/26 ; G02B 6/42 ;
U.S. Cl.
CPC ...
G02B 6/26 ; G02B 6/42 ;
Abstract
An object of the present invention is to prevent an increase of the degree of polarization of an output pumping light even if one of pumping light sources has a failure. Laser diodes ( ) are composed of FP-LDs made of InGaAsP to laser-oscillate at 1480 nm band. The outputs from the laser diodes ( ) enter a polarizing beam splitter ( ) in orthogonal state of polarization and are combined there. The combined light by the polarizing beam splitter ( ) enters a depolarizing element ( ) and is depolarized there.