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:
Mar. 08, 2016
Filed:
Feb. 18, 2013
Applicant:
Hiroyuki Yamazaki, Tokyo, JP;
Inventor:
Hiroyuki Yamazaki, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04J 14/00 (2006.01); H04B 10/60 (2013.01); H04B 10/61 (2013.01); G02B 6/42 (2006.01); G02B 6/10 (2006.01); G02B 6/12 (2006.01); H04B 10/25 (2013.01); H04J 14/06 (2006.01);
U.S. Cl.
CPC ...
H04B 10/60 (2013.01); G02B 6/105 (2013.01); G02B 6/12004 (2013.01); G02B 6/4213 (2013.01); H04B 10/25 (2013.01); H04B 10/61 (2013.01); H04J 14/06 (2013.01);
Abstract
A planar lightwave circuit includes a substrate in which a groove being formed, the groove dividing the substrate into a first area and a second area; a first filter, a second filter, and a third filter intruded into the groove; as are formed in the first area, a first and a second waveguides formed to guide signal light and local oscillation light; a third and a fourth waveguides formed to guide signal light and local oscillation light; a first 90-degree optical hybrid; as are formed in the second area, a fifth and sixth waveguides formed to guide signal light and local oscillation light; and a second 90-degree optical hybrid.