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:
Nov. 27, 2012
Filed:
Jan. 22, 2008
Tsuyoshi Yoshida, Tokyo, JP;
Toshiyuki Tokura, Tokyo, JP;
Takashi Sugihara, Tokyo, JP;
Katsuhiro Shimizu, Tokyo, JP;
Aritomo Uemura, Tokyo, JP;
Hiroki Shima, Tokyo, JP;
Kiyoshi Onohara, Tokyo, JP;
Tsuyoshi Yoshida, Tokyo, JP;
Toshiyuki Tokura, Tokyo, JP;
Takashi Sugihara, Tokyo, JP;
Katsuhiro Shimizu, Tokyo, JP;
Aritomo Uemura, Tokyo, JP;
Hiroki Shima, Tokyo, JP;
Kiyoshi Onohara, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A repeater includes a variable optical attenuating unit that collectively attenuates WDM optical signal input, an optical-attenuation adjusting unit that adjusts attenuation in the variable optical attenuating unit, and an optical amplifying unit that collectively amplifies and outputs the WDM optical signal collectively attenuated, to a downstream side. An optical-attenuation adjusting unit includes an input level detector; an output level detector; an output-level transmitting unit that receives information of a signal level of WDM optical signal output by a repeater at an upstream side and transmits information of a signal level of the WDM optical signal detected by the output level detector to a repeater at a downstream side; and an attenuation amount controller that controls the variable optical attenuating unit by calculating an attenuation amount thereof based on information of a signal level detected by the input level detector and a signal level received by the output-level transmitting unit.