Optical wavelength division multiplexing (WDM) system...

Optical communications – Transmitter – Including compensation

Reexamination Certificate

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Details

C398S182000, C398S183000, C398S195000, C398S196000, C398S197000, C398S198000, C398S079000, C398S162000, C398S033000

Reexamination Certificate

active

08086110

ABSTRACT:
An optical communication system comprising a transmitter including a data register having a plurality of outputs, each output comprising a separate data channel, a plurality of signal processors, each signal processor corresponding to a data, a plurality of laser modules, each laser module coupled to an output of a corresponding signal processor, wherein each laser module modulates the modified signal from its corresponding data channel onto an optical carrier having a selected wavelength, and an optical multiplexer coupled to an output of all the laser modules. Each signal processor comprises a first input to receive a signal from the corresponding data channel and one or more additional inputs to receive a signal from one or more adjacent data channels, a control input to receive a control signal generated at a receiver based upon a monitored characteristic of the received signal from the corresponding data channel, and logic to modify a characteristic of the signal from the corresponding channel based upon the control signal and the signals from the one or more adjacent data channels.

REFERENCES:
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patent: 7171127 (2007-01-01), Matsuo
patent: 7613400 (2009-11-01), Cheng et al.
patent: 2005/0185546 (2005-08-01), Watabe
J. Poirrier et al., “Electronic WDM Crosstalk Cancellation,” Proc. 27th European Conference on Optical Communication (ECOC '01-Amsterdam), Mo.L.3.5, pp. 94-95.
R.I. Killey et al., “Electronic Dispersion Compensation by Signal Predistortion Using Digital Processing and a Dual-Drive Mach Zehnder Modulator,”IEEE Photonics Technology Letters, vol. 17, No. 3, Mar. 2005, pp. 714-716.

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