| CPC H04B 10/616 (2013.01) [H04B 10/5161 (2013.01); H04B 10/612 (2013.01)] | 20 Claims |

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1. An apparatus enabled to selectively choose a baud rate for communication of coherent optical data, the apparatus comprising:
a modem coupled to an optical link to operate with a coherent optical signal modulated at a plurality of baud rates, wherein the modem contains logic enabled to:
adjust a baud rate from the plurality of baud rates to a selected baud rate based on a modulation format and an available passband of the optical link.
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