Optical communications – Transmitter and receiver system – Including optical waveguide
Reexamination Certificate
2005-05-24
2005-05-24
Negash, Kinfe-Michael (Department: 2633)
Optical communications
Transmitter and receiver system
Including optical waveguide
C398S039000, C398S081000, C398S136000, C398S158000, C398S208000, C398S210000
Reexamination Certificate
active
06898379
ABSTRACT:
An interference-reducing optoelectronic device determines the value of a current data bit in an optical data stream. A receiver receives the optical data stream, which is converted to a series of samples by a D/A converter. A set of adaptive filters, each filter corresponding to a unique possible value for one or more prior data bits, filters the series of samples utilizing variable tap coefficients to generate filtered output values. The variable tap coefficients are at least partially different than the variable tap coefficients of another adaptive filter. Comparators compare the filtered output values against filter-specific adaptive threshold values to generate tentative values for the current data bit. A delay mechanism delays a determined value for the prior data bits, and a selection mechanism determines the value of the current data bit by selecting the tentative value corresponding to the delayed determined value of the prior data bits.
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Gottfried Ungerboeck,Fractional Tap-Spacing Equalizer and Consequences for Clock Recovery in Data Modems, IEEE Transactions on Communications, vol. COM-24, No. 8, Aug. 1976, pp. 856-864.
Giaretta Giorgio
Lenosky Thomas J.
Lipson Jan
Finisar Corporation
Negash Kinfe-Michael
Workman Nydegger
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