Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-09-30
2000-05-09
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
375296, 327317, H04B 1000
Patent
active
060611618
ABSTRACT:
A distortion-compensation circuit for use on a wideband optical-fiber communication system is provided. This distortion-compensation circuit can compensate for the CSO/CTB (composite second order and composite third beat) distortions in the transmitted signals that are caused due to the intermodulation of undesired harmonics that are caused by nonlinear devices in the system. The distortion-compensation circuit includes splitting means, such as a directional coupler, for splitting the input signal into a first signal and a second signal. The first signal is directed to a first path, while the second signal is directed to a second path. A featured CSO/CTB generator is coupled on the second path to receive the second signal for selectively generating a compensating CSO/CTB output from the second signal. Further, combining means, such as another directional coupler, is arranged at the end of the first and second paths, for combining the compensating CSO/CTB output of the CSO/CTB generator with the first signal. The compensating CSO/CTB output can be used to offset the CSO/CTB distortions previously or subsequently generated in the optical fiber communication system.
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"Subcarrier Multiplexed Lightwave System Design Considerations for Subscriber Loop Applications", IEEE Journal of Lightwave Technology, vol. 7, No. 11, Nov. 1989.
Liang Ren-Yuh
Yang Chien-Rong
Huang Jiawei
Negash Kinfe-Michael
New Elite technologies, Inc.
Patents J. C.
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