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:
Oct. 14, 2008
Filed:
Feb. 18, 2005
Tasuku Fujieda, Tokyo, JP;
Hideki Goto, Tokyo, JP;
Kenichi Asakawa, Kanagawa, JP;
Hitoshi Mikada, Kanagawa, JP;
Katsuyoshi Kawaguchi, Kanagawa, JP;
Tasuku Fujieda, Tokyo, JP;
Hideki Goto, Tokyo, JP;
Kenichi Asakawa, Kanagawa, JP;
Hitoshi Mikada, Kanagawa, JP;
Katsuyoshi Kawaguchi, Kanagawa, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Japan Agency for Marine-Earth Science and Technology, Yokosuka-shi, JP;
Abstract
In each of a plurality of submarine observation apparatus (to n), a branching unit () branches fixed-wavelength light (λ) from an incoming wavelength-multiplexed light signal. An observation signal modulating unit () modulates the intensity of the branched fixed-wavelength light (λ) with observation information multiplexed by an observation signal multiplex unit (). A combining unit () combines light signals (λ) to (λn) passing through the branching unit () and the fixed-wavelength light (λa) modulated by the observation signal modulating unit () into a composite light signal, and outputs it to an optical fiber (). Therefore, in each of the plurality of submarine observation apparatus (to n), there is no necessity for providing a wavelength-division-multiplexing-transmission optical transmitter which requires high wavelength stability.