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:
Sep. 30, 2008
Filed:
Jun. 01, 2005
Mamoru Suematsu, Yokohama, JP;
Akira Yamamoto, Yokohama, JP;
Haruki Tanaka, Yokohama, JP;
Hideaki Sugiya, Kawasaki, JP;
Yuki Murakami, Kawasaki, JP;
Hisayuki Ojima, Yokohama, JP;
Mamoru Suematsu, Yokohama, JP;
Akira Yamamoto, Yokohama, JP;
Haruki Tanaka, Yokohama, JP;
Hideaki Sugiya, Kawasaki, JP;
Yuki Murakami, Kawasaki, JP;
Hisayuki Ojima, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical transmission system is provided which is capable of booting the system by using an ASE (Amplified Spontaneous Emission) light in a manner to provide high quality. A pre-amplifier receives noise light and does gain setting in an amplifier booting mode and receives an optical signal and to amplify the received signal in a working mode. A variable dispersion compensator is placed in a preceding-stage of the pre-amplifier and makes compensation of dispersion of a wavelength occurring when an optical signal propagates through an optical fiber in a variable manner. A switching unit to select, when the noise light passes through the variable dispersion compensator, if a level of the noise light is deviated from a desired level, a bypass route so as to make the noise light not be input to the variable dispersion compensator but be input to the pre-amplifier in an amplifier booting mode according to a switching instruction and to select a passage route so as to make the optical signal, after having been input to the variable dispersion compensator and having undergone dispersion compensation, be input to the pre-amplifier according to the switching instruction in a working mode.