Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-03-31
2000-03-28
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359133, 359187, H04J 1402, H04B 1006
Patent
active
060439157
ABSTRACT:
Methods and apparatus for stabilizing or otherwise controlling optical signal power levels in a multi-channel optical communication system. A multi-channel optical signal is detected in a single receiver, and the resulting detected signal is supplied to a correlator. The correlator correlates the detected multi-channel signal with a data signal associated with a particular channel to be controlled in order to generate a measure of the optical signal power of the particular channel. The measure is utilized in a feedback control loop to control an optical signal power level of the particular channel. The correlator may generate the measure of optical signal power by mixing the detected signal and the data signal in an RF mixer, by multiplying the detected signal and a data signal in the form of a unique identifier associated with the particular channel, or by using other suitable correlation techniques. A feedback control processor may be used to process the measure to generate a control signal which is applied to a current source generating current for the particular channel in a multi-frequency laser or other multi-channel optical source. The processor may sequentially monitor and control each of the multiple channels of the multi-channel optical signal using the same receiver and correlator.
REFERENCES:
patent: 5745275 (1998-04-01), Giles
patent: 5870217 (1999-02-01), Itou et al.
M. Zirngibl et al., "Demonstration of a 9.times.200 Mbit/s Wavelength Division Multiplexed Transmitter," Electronics Letters, vol. 30, pp. 1484-1485, Jul. 1994.
C.R. Doerr et al., "Elimination of Signal Distortion and Crosstalk from Carrier Density Changes in the Shared Semiconductor Amplifier of Multifrequency Signal Sources," IEEE Photonics Technology Letters, vol. 7, No. 10, pp. 1131-1133, Oct. 1995.
Giles Clinton Randy
Zirngibl Martin
Lucent Technologies - Inc.
Pascal Leslie
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