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:
Jan. 29, 2008
Filed:
Apr. 07, 2003
Masato Tanaka, Kanagawa, JP;
Toshiaki Okuno, Kanagawa, JP;
Fumiyoshi Ohkubo, Kanagawa, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
It is an object of the present invention to provide an optical transmission system in which multiple optical frequencies can be efficiently used and the change of the system can be easily made, and to provide an optical demultiplexer suitable for such optical transmission system. In an optical demultiplexer according to the present invention, signal light having a plurality of wavelength components arranged on a grid having predetermined frequency intervals is input from an input port thereof to be demultiplexed. The demultiplexed signal lights output from the output ports thereof have a plurality of wavelength components, respectively, and any three wavelength components, f, f, and f, that satisfy the following conditions: f<f<f; and f−f≦NΔf have the following relationship: 2f≠f+fwhere N represents an integer, and Δf represents each of the predetermined frequency intervals.