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:
Feb. 05, 2013
Filed:
Jun. 30, 2009
Shin Kamei, Atsugi, JP;
Tsutomu Kitoh, Atsugi, JP;
Masaki Kohtoku, Atsugi, JP;
Tomohiro Shibata, Atsugi, JP;
Takuya Tanaka, Atsugi, JP;
Yasuyuki Inoue, Atsugi, JP;
Mikitaka Itoh, Atsugi, JP;
Shin Kamei, Atsugi, JP;
Tsutomu Kitoh, Atsugi, JP;
Masaki Kohtoku, Atsugi, JP;
Tomohiro Shibata, Atsugi, JP;
Takuya Tanaka, Atsugi, JP;
Yasuyuki Inoue, Atsugi, JP;
Mikitaka Itoh, Atsugi, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An optical wavelength multiplexing/de-multiplexing circuit having a low loss and a flat transmission spectrum is provided. The optical wavelength multiplexing/de-multiplexing circuit compensates a temperature dependence of a center transmission wavelength which remains in an athermal AWG, and has an excellent accuracy of the center transmission wavelength in a whole operating temperature range or has a comparatively wide operable temperature range. The temperature dependence of the transmission wavelength in the athermal MZI is modulated and set so as to cancel the temperature dependence of the center wavelength which remains in the athermal AWG. The present invention focuses particularly on an optical coupler in the MZI and modulates the temperature dependence of the transmission wavelength in the MZI by providing the optical coupler itself with a mechanism which changes a phase difference between two outputs by temperature.