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:
Jun. 06, 1995
Filed:
Mar. 04, 1994
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 24 ; 385 31 ; 385 22 ;
Abstract
In an optical demultiplexing system comprising a plurality of optical demultiplexers for separating the component optical signals respectively having predetermined wavelengths of an input wavelength-multiplexed optical signal, a first optical amplifier is connected to the input of the optical demultiplexer disposed at the input end of the optical demultiplexing system, and a plurality of optical amplifiers are disposed to amplify the output optical signal of the first optical amplifier before the S/N ratio of the optical signal is caused to fall by optical losses caused within the optical demultiplexing system below a predetermined S/N ratio guaranteeing a predetermined bit error rate.