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:
Jan. 26, 2010
Filed:
Mar. 21, 2006
Applicants:
Yutaka Ohki, Tokyo, JP;
Naoki Tsukiji, Tokyo, JP;
Hidehiro Taniguchi, Tokyo, JP;
Inventors:
Assignee:
The Furukawa Electric Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04B 10/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A first light feedback element is arranged at an optical distance Lfrom a front facet of a semiconductor laser from which an output light is emitted on an optical path of the output light. An i-th light feedback element is arranged at an optical distance Li from the front facet on the optical path of the output light, where i=2 to n, n is a positive integer not less than 2, and Li>L. Land Li satisfies ((M−1)+0.01)<(Li/L)<(M−0.01), where M is a positive integer not less than 2, satisfying (M−1)<(Li/L)≦M.