Coherent transceiver architecture
First Claim
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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Accused Products
Abstract
A coherent receiver comprises an ingress signal path having an ingress line-side interface, and an ingress host-side interface. The ingress signal path is configured to receive an analog signal vector at the ingress line-side interface, to demodulate the analog signal vector, and to output a digital data signal at the ingress host-side interface. The coherent receiver also comprises clock and timing circuitry configured to receive a single reference clock signal and to provide a plurality of modified ingress path clock signals to different components of the ingress signal path, the plurality of modified ingress path clock signals derived from the single reference clock signal and the plurality of modified ingress path clock signals having different clock rates. The receiver, transmitter, or transceiver can operate in a plurality of programmable operating modes to accommodate different modulation/de-modulation schemes, error correction code schemes, framing/mapping protocols, or other programmable features.
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Citations
20 Claims
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1. An optical communication system comprising:
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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, and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical communication system, comprising:
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an optical module to convert an optical signal received over an optical network operating at 100 Gigahertz or higher to an analog signal vector; a coherent receiver comprising; an ingress signal path comprising a plurality of ingress path clock domains including; an ingress analog-to-digital converter clock domain including an analog-to-digital converter operating at a first sampling rate according to a first clock signal, the analog-to-digital converter to convert the analog signal vector to a digital signal vector; an ingress digital signal processor clock domain including an ingress digital signal processor operating at a second sampling rate according to a second clock signal, the ingress digital signal processor to demodulate the digital signal vector to generate a demodulated digital signal vector; and an ingress host interface clock domain including an ingress host interface operating at a third sampling rate according to a third clock signal, the ingress host interface to output the demodulated digital signal, wherein the first, second, and third sampling rates are different; 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; and a physical layer processor to de-map and de-frame the demodulated digital signal vector into a output data signal; and a fabric interface to transmit the output data signal to a host device. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An optical communication system, comprising:
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an ingress optical module to convert an ingress optical signal received over an optical network operating at 100 Gigahertz or higher to an ingress analog signal vector; a coherent receiver comprising; an ingress signal path comprising a plurality of ingress path clock domains including; an analog-to-digital converter clock domain including an analog-to-digital converter operating at a first sampling rate according to a first clock signal, the analog-to-digital converter to convert the ingress analog signal vector to an ingress digital signal vector; an ingress digital signal processor clock domain including an ingress digital signal processor operating at a second sampling rate according to a second clock signal, the ingress digital signal processor to demodulate the ingress digital signal vector to generate a demodulated digital signal vector; and an ingress host interface clock domain including an ingress host interface operating at a third sampling rate according to a third clock signal, the ingress host interface to output the demodulated digital signal, wherein the first, second, and third sampling rates are different; ingress 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; and an ingress physical layer processor to de-map and de-frame the demodulated digital signal vector into a output data signal; an ingress fabric interface to transmit the output data signal to a host device; an egress fabric interface to receive an input data signal from the host device; an egress physical layer processor to map and frame the input data signal into an egress digital 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 fourth sampling rate according to a fourth clock signal the egress host-side interface configured to receive the egress digital signal, an egress digital signal processor clock domain including an egress digital signal processor operating at a fifth sampling rate according to a fifth clock signal, the egress digital signal processor to modulate the egress digital signal, and a digital-to-analog converter clock domain including a digital-to-analog converter operating at a sixth sampling rate according to a sixth clock signal, the digital-to-analog converter to output an egress analog signal vector to an egress line-side interface, wherein the fourth sample rate, the fifth sampling rate, and the sixth sampling rate are different; and egress clock and timing circuitry configured to receive the single reference clock signal and to derive the fourth clock signal, the fifth clock signal, and the sixth clock signal from the single reference clock signal; and an egress optical module to convert the egress analog signal vector to an egress optical signal suitable for transmission over the optical network. - View Dependent Claims (20)
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Specification