Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-03-21
1999-07-06
Bacares, Rafael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359110, 359177, H04B 1000
Patent
active
059204141
ABSTRACT:
A wavelength division multiplexing optical transmission apparatus comprises an optical wavelength demultiplexer which demultiplexes, for each wavelength, the wavelength division multiplex optical signal transmitted via an optical fiber, receivers which receive the output beams from the optical wavelength demultiplexer, a wavelength detector that detects the difference between the wavelength of a transmitter and a wavelength minimizing the loss in the optical wavelength demultiplexer, and an alarm generator that determines an abnormality when the wavelength difference has exceeded an allowable value and raises the alarm.
REFERENCES:
patent: 5500756 (1996-03-01), Tsushima et al.
patent: 5546213 (1996-08-01), Suyama
patent: 5589970 (1996-12-01), Lyu et al.
patent: 5703711 (1997-12-01), Hamada
patent: 5706112 (1998-01-01), Morita
patent: 5768312 (1998-06-01), Imamura
IEICI Trans. Commun., vol. E76-B, No. 9, pp.1136-1144, Sep. 1993, Toshiyuki Tsuchiya et al., "Major Factors Affecting Fiber-Optic Transmission System Design for Radio Base Stations".
Miyachi Masahide
Ohshima Shigeru
Bacares Rafael
Kabushiki Kaisha Toshiba
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