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. 26, 2009
Filed:
Mar. 14, 2005
Hiroaki Munehira, Tokyo, JP;
Junichi Nakagawa, Tokyo, JP;
Toshiyuki Tokura, Tokyo, JP;
Kenichi Asakawa, Kanagawa, JP;
Hitoshi Mikada, Kanagawa, JP;
Katsuyoshi Kawaguchi, Kanagawa, JP;
Hiroaki Munehira, Tokyo, JP;
Junichi Nakagawa, Tokyo, JP;
Toshiyuki Tokura, Tokyo, JP;
Kenichi Asakawa, Kanagawa, JP;
Hitoshi Mikada, Kanagawa, JP;
Katsuyoshi Kawaguchi, Kanagawa, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Independent Administrative Institution, Japan Agency for Marine-Earth Science and Technology, Yokosuka-shi, JP;
Abstract
The present invention discloses a submarine observation system in which a plurality of carrier lights assigned to each submarine observation equipment is transmitted from a land terminal apparatus to an optical submarine cable (down-going) by using a WDM transmission. In the submarine observation equipment, only a prescribed carrier light is demultiplexed by an optical demultiplexer, an observation signal indicating an observation result is generated by an observation device, intensity of the carrier light demultiplexed by the optical demultiplexer is modulated by an optical amplifier based on an observation signal, and the modulated carrier light is multiplexed by an optical multiplexer. The multiplexed carrier light is output to the optical submarine cable (up-going) to be returned to the land terminal apparatus being the transmission station. The land terminal apparatus is able to obtain an observation signal of each observation point by separating carrier lights based on each wavelength and receiving a separated carrier light of each wavelength. Accordingly, the system can be structured with one optical fiber and can be extendable by increasing or decreasing carrier lights, and either one of the land terminal apparatuses can receive an observation signal even when the optical submarine cable is cut off.