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:
Oct. 13, 1998
Filed:
Aug. 07, 1996
Yasushi Hara, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An optical branching apparatus for branching optical transmission lines as reverse and forward links through a plurality of ports includes a plurality of demultiplexing units, a plurality of multiplexing units, and a plurality of optical transmission media. Each of the plurality of demultiplexing unit is arranged in each of the ports to demultiplex a light beam input from the optical transmission line in accordance with one of a wavelength and a wavelength band. Each of the plurality of multiplexing units is arranged in the each port to multiplex light beams having different wavelengths or wavelength bands demultiplexed by the demultiplexing units of remaining ports and outputs a multiplexed light beam to the optical transmission line. One of the wavelength and the wavelength band is determined in accordance with a combination of an optical transmission source and an optical transmission destination. Each of the plurality of optical transmission media connects the each demultiplexing unit to at least one of the multiplexing units of the remaining ports to perform optical transmission.