DIGITAL FILTER, PARTIAL RESPONSE EQUALIZER, AND DIGITAL COHERENT RECEIVER DEVICE AND METHOD
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United States of America Patent
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Issued Date -
Dec 18, 2014
app pub date -
Dec 19, 2012
filing date -
Dec 30, 2011
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Abstract
Aspects of the present invention include devices and methods for receiving signals in communication systems. A partial response equalizer includes a full response linear equalizing device for equalizing a received signal; and a partial response post filter for post filtering the equalized signal. Aspects of the present invention devices and methods for coherently receiving signals in an optical communication system. A receiver front end converts a received partial response optical signal to a partial response digital signal. An equalizing device equalizes the pre-filtered full response digital signal. A full response carrier recovery device performs carrier recovery of the signal equalized by the equalizing device. A post-filter filters the signal having undergone carrier recovery by the full response carrier recovery device.
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