Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1998-01-22
2000-06-27
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359110, 359124, H04B 1008, H04J 1402
Patent
active
060813598
ABSTRACT:
A transmitting apparatus has a plurality of optical signal transmitters, a plurality of transmitting transponders for converting the wavelengths of optical signals transmitted from the optical transmitters into respective wavelengths and transmitting wavelength-converted optical signals, a wavelength-division-multiplexer for wavelength-division-multiplexing the wavelength-converted optical signals, and an auxiliary transmitting transponder for converting a wavelength of an optical signal transmitted from the optical signal transmitters into a wavelength different from the wavelength-converted optical signals, and transmitting an auxiliary wavelength-converted optical signal. The transmitting transponders are monitored by a supervising unit, which outputs a detected failure signal when it detects a failure of one of the transmitting transponders. In response to the detected failure signal, a transmission switch supplies an output signal from the auxiliary transmitting transponder, rather than the output signal from the failing transmitting transponder, to the wavelength-division-multiplexer. A supervising control signal transmitting unit transmits a supervising control signal to an optical transmission path. In response to the supervising control signal, a receiving apparatus switches from a receiving transponder corresponding to the failing transmitting transponder to a receiving auxiliary transponder.
REFERENCES:
patent: 5299293 (1994-03-01), Mestdagh et al.
patent: 5739934 (1998-04-01), Nomura et al.
patent: 5920414 (1999-07-01), Miyachi et al.
patent: 5923453 (1999-07-01), Yoneyama
patent: 5999291 (1999-12-01), Anderson
Tajima Tsutomu
Takehana Tsukasa
NEC Corporation
Pascal Leslie
Singh Dalzid
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