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US 5,675,676 AGranted
Optical branching apparatus and transmission line switching method
AssigneeNEC Corporation
InventorsShuji Yamashita, Kiyoshi Sekikawa
Life of this patent
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AssigneeNEC Corporation
InventorsShuji Yamashita, Kiyoshi Sekikawa
Estimating the term…
An optical branching apparatus in which a pair of optical transmission lines as reverse and forward links are branched into a plurality of lines includes a plurality of wavelength demultiplexing ports and a plurality of optical transmission media. The plurality of wavelength demultiplexing ports have wavelength demultiplexing/multiplexing units each connected to a branch point of each of the optical transmission lines to demultiplex a light beam having different wavelengths from the each optical transmission line and output demultiplexed light beams to branch destinations, and to transmit light beams having different wavelengths and input from branch sources and output a multiplexed light beam to the each optical transmission line. The plurality of optical transmission media connect the wavelength demultiplexing ports corresponding to the reverse link and the wavelength demultiplexing ports corresponding to the forward link in accordance with wavelengths of light beams which are used depending on a normal state and occurrence of a failure.
An optical branching apparatus in which a pair of optical transmission lines as reverse and forward links are branched into a plurality of lines, comprising:
A transmission line switching method for an optical branching apparatus including a plurality of wavelength demultiplexing ports having wavelength demultiplexing/multiplexing means, each connected to a branch point of each of a pair of optical transmission lines as reverse and forward links branched into a plurality of lines, for demultiplexing a light beam having different wavelengths from said each optical transmission line and outputting demultiplexed light beams to branch destinations, and for transmitting light beams having different wavelengths input from branch sources and outputting a multiplexed light beam to said each optical transmission line, and a plurality of optical transmission media for connecting said wavelength demultiplexing ports corresponding to the reverse link and said wavelength demultiplexing ports corresponding to the forward link in accordance with wavelengths of light beams, comprising the steps of:
Dependencies are inferred from the claim text.