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:
Nov. 21, 2023
Filed:
Apr. 16, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Junji Sakamoto, Musashino, JP;
Toshikazu Hashimoto, Musashino, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
An optical multiplexing circuit includes a plurality of branching units configured to each divide light output from a corresponding one of a plurality of input waveguides, a multiplexing unit configured to multiplex a plurality of first beams of the light, each obtained by dividing the light by a corresponding one of the plurality of branching units, an output waveguide configured to output the light multiplexed by the multiplexing unit, a plurality of monitoring filters configured to individually input, via a first monitoring waveguide, a corresponding one of a plurality of second beams of the light, a wavelength through each of the plurality of monitoring filters having a transmittance of 50% being set to be a center wavelength of the plurality of second beams of the light, and a change in wavelength due to an assumed change in temperature being set to be less than half of an FSR, and a plurality of second monitoring waveguides.