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:
Sep. 15, 2009
Filed:
Jul. 02, 2004
Takayuki Mizuno, Yamato, JP;
Hiroshi Takahashi, Atsugi, JP;
Tsutomu Kitoh, Atsugi, JP;
Manabu Oguma, Yamato, JP;
Shunichi Souma, Atsugi, JP;
Takayuki Mizuno, Yamato, JP;
Hiroshi Takahashi, Atsugi, JP;
Tsutomu Kitoh, Atsugi, JP;
Manabu Oguma, Yamato, JP;
Shunichi Souma, Atsugi, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
The present invention discloses an interferometer optical switch that can carry out switching over a broad band and has a high extinction ratio and large fabrication tolerance. The interferometer optical switch employs a phase generating coupler, the phase difference of the output of which has wavelength dependence, as at least one of the optical multi/demultiplexing device included in the interferometer optical switch. A wavelength insensitive interferometer optical switch is implemented by making the sum 2π{φ(λ)+φΔ(λ)+φ(λ)} constant regardless of the wavelength, where φ(λ) is the phase produced by the first optical multi/demultiplexing device, 2πφΔ(λ) is the phase difference of the optical delay line with an optical path length difference of ΔL, and 2πφ(λ) is the phase produced by the second optical multi/demultiplexing device.