Multiplex communications – Wide area network – Packet switching
Patent
1988-06-27
1990-06-12
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
455618, H04B 900
Patent
active
049339290
ABSTRACT:
In a wavelength multiplexed optical transmission system, digital signals of separate channels are respectively converted into optical signals of different wavelengths which are assigned to plural optical channels and multiplexed into a beam optical signal for coupling to an optical transmitted medium. Each of the optical channels includes a semiconductor laser for emitting a laser beam and an optical phase or frequency modulator for modulating the laser beam with one of the digital input signals. A light intensity limiter, or a laser diode saturable light amplifier is located in the path of the light from the modulator to maintain the modulated laser beam at a constant amplitude to prevent interchannel crosstalk which would otherwise occur in the transmission medium as a result of variations in the output of the laser and/or modulator.
REFERENCES:
patent: 4561117 (1985-12-01), Epworth
patent: 4611352 (1986-09-01), Fujito
patent: 4635246 (1987-01-01), Taylor et al.
patent: 4763326 (1988-09-01), Krick
Electronics Letter, vol. 20, No. 24, pp. 996-997, Nov. 22, 1984.
IEEE Journal of Quantum Electronics QE-vol. 19, No. 1, pp. 47-58-Jan. 1983.
Journal of Optical Society of America, vol. 2, No. 8, pp. 1320-1326-Aug. 1985.
Beek L. Van
NEC Corporation
Safourek Benedict V.
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