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Coherent transceiver architecture

  • US 9,735,881 B1
  • Filed: 05/06/2016
  • Issued: 08/15/2017
  • Est. Priority Date: 11/29/2012
  • Status: Active Grant
First Claim
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1. An optical communication system comprising:

  • a fabric interface to receive an input data signal from a host device;

    a physical layer processor to map and frame the input data signal into a digital transmit signal;

    a coherent transmitter, comprising;

    an egress signal path comprising a plurality of egress path clock domains including;

    an egress host interface clock domain including an egress host-side interface operating at a first sampling rate according to a first clock signal the egress host-side interface configured to receive the digital transmit signal,an egress digital signal processor clock domain including an egress digital signal processor operating at a second sampling rate according to a second clock signal, the egress digital signal processor to modulate the digital data signal, anda digital-to-analog converter clock domain including a digital-to-analog converter operating at a third sampling rate according to a third clock signal, the digital-to-analog converter to output an analog signal vector to an egress line-side interface, wherein the first sample rate, the second sampling rate, and the third sampling rate are different; and

    clock and timing circuitry configured to receive a single reference clock signal and to derive the first clock signal, the second clock signal, and the third clock signal from the single reference clock signal; and

    an optical module to convert the analog signal vector to an optical signal suitable for transmission over an optical network operating at 100 Gigahertz or higher.

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