Optical waveguides – With optical coupler – Plural
Patent
1997-12-23
1999-08-10
Ullah, Akm E.
Optical waveguides
With optical coupler
Plural
359123, G02B 628
Patent
active
059371170
ABSTRACT:
An optical cross-connect system which can be constructed using the same kind of optical switches having a small extinction ratio and a small number of optical switch driving circuits is provided. The optical signal selector in the system comprises a first optical switching device for permitting only the wavelength-division multiplexed light beam passing through one of plural optical paths to pass, a wavelength router for demultiplexing the permitted multiplexed light beam into optical signals of different wavelengths and respectively outputting these demultiplexed signals into different output ports, this router having a routing characteristic such that the output port to which each demultiplexed signal is output is different for each input port, a second optical switching device for permitting only one of the optical signals output from plural optical paths connected to the output ports of the wavelength router to pass, and an optical combiner for combining the optical paths of the second optical switching device.
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Ishida Osamu
Sato Ken'ichi
Takachio Noboru
Nippon Telegraph and Telephone Corporation
Ullah Akm E.
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