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:
Apr. 07, 1998
Filed:
Mar. 18, 1996
Kenji Ohta, Kawasaki, JP;
Mitsuo Kitamura, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
An optical repeater is provided between terminal stations and amplifies optical signals that have entered via optical fibers in upward and downward directions and outputs the amplified optical signals to optical fibers in respective directions. The optical fiber on the output side of an upward optical amplifier and the optical fiber on the output side of a downward optical amplifier are optically coupled, with a prescribed loss, by a photocoupler. The upward optical signal is looped back to the optical fiber in the downward direction upon being attenuated by, say, 40 dB via the photocoupler, and the downward optical signal is looped back to the optical fiber in the upward direction upon being attenuated by, say, 40 dB, via the photocoupler.