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:
Jul. 07, 1998
Filed:
Sep. 25, 1996
Yoshiyuki Inoue, Kawasaki, JP;
Takashi Miyazaki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A device is used for receiving input signal light and pump light from a first remote site through a first optical fiber and a second optical fiber, respectively, and for sending amplified signal light through a third optical fiber to a second remote site. The device includes an amplifier unit for amplifying the input signal light by using the pump light to transmit the amplified signal light to the third optical fiber, the amplifier unit having a prevention unit for preventing light coming back through the third optical fiber from entering the amplifier unit, and a path providing unit for providing a path inside the device, the path leading reflection light coming through the third optical fiber to a connection point of the device, the connection point having optical connection with the first remote site, wherein the reflection light is a light pulse for fault localization reflected at a fault point on the third optical fiber, the light pulse for fault localization sent to the third optical fiber from the first remote site via the device.