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:
May. 27, 2014
Filed:
Aug. 25, 2010
Tsutomu Kitoh, Atsugi, JP;
Shin Kamei, Atsugi, JP;
Toshikazu Hashimoto, Atsugi, JP;
Yohei Sakamaki, Atsugi, JP;
Hiroshi Takahashi, Atsugi, JP;
Manabu Oguma, Atsugi, JP;
Tsutomu Kitoh, Atsugi, JP;
Shin Kamei, Atsugi, JP;
Toshikazu Hashimoto, Atsugi, JP;
Yohei Sakamaki, Atsugi, JP;
Hiroshi Takahashi, Atsugi, JP;
Manabu Oguma, Atsugi, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An optical wavelength multi/demultiplexer having transmission characteristics with a higher rectangular degree than a conventional one includes an AWG and two-stage lattice circuit. An example of a two-stage lattice circuit according to the present invention includes an input waveguide, a third optical coupler, a third and fourth arm waveguides, a second optical coupler, a first and second arm waveguides, a first optical coupler, and output waveguides. The optical path length differences between the third and fourth arm waveguides and between the first and second arm waveguides are designed to be ΔL. The path passing the third and first arm waveguides differs by 2·ΔL in optical length from that the fourth and second arm waveguides. The paths passing the third and second arm waveguides and passing the fourth and first arm waveguides differ by ΔL from that passing the fourth and second arm waveguides.