Symbol timing and clock recovery for variable-bandwidth optical signals
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United States of America Patent
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Feb 14, 2017
Grant Date -
Mar 31, 2016
app pub date -
Sep 29, 2014
filing date -
Sep 29, 2014
priority date (Note) -
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Abstract
We disclose an optical receiver having a configurable clock-recovery module, an operative configuration of which is selectable based on a bandwidth of the optical input signal. In an example embodiment, the clock-recovery module adopts a first configuration for non-Nyquist optical input signals, and adopts a different second configuration for Nyquist and faster-than-Nyquist optical input signals. The configurability of the clock-recovery module may advantageously prevent the clock-recovery algorithm from breaking down, e.g., due to variability of the bandwidth of the optical input signal caused by the variability of the routes that optical signals may take in the corresponding optical-transport network before arriving at the optical receiver.
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