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. 09, 2001
Filed:
Mar. 17, 1999
Kenichi Yoneyama, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A supervisory signal light bypass circuit which has: a first 2×2 optical coupler provided on a first optical transmission line; a second 2×2 optical coupler provided on a second optical transmission line through which signal light flows in the direction opposite to the first optical transmission line; a third optical transmission line that connects to one output port of the first optical coupler and one output port of the second optical coupler: a first reflecting member that is provided at another output port of the first optical coupler and has a first reflection wavelength; and a second reflecting member that is provided at another output port of the second optical coupler and has a second reflection wavelength.