Apparatus and methods for digital signal constellation transformation
AssigneeInphi Corporation
InventorShu Hao Fan
Life of this patent
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Abstract
Apparatus and method for digital signal constellation transformation are provided herein. In certain configurations, an integrated circuit includes an analog front-end that converts an analog signal vector representing an optical signal into a digital signal vector, and a digital signal processing circuit that processes the digital signal vector to recover data from the optical signal. The digital signal processing circuit generates signal data representing a signal constellation of the digital signal vector. The digital signal processing circuit includes an adaptive gain equalizer that compensates the signal data for distortion of the signal constellation arising from biasing errors of optical modulators used to transmit the optical signal.
Claims20
An integrated circuit device, the device comprising:
- a digital signal processing circuit configured to receive a digital signal vector and to generate signal data representing a signal constellation of the digital signal vector;
- and
- wherein the digital signal processing circuit comprises an adaptive gain equalizer configured to generate an estimate of an angular tilt of the signal constellation and to generate transformed signal data by compensating the signal data for distortion of the signal constellation based on the estimate of the angular tilt.
An integrated optical module device, the device comprising:
- an optical receiver configured to receive an optical signal from an optical cable and to generate an analog signal vector representing the optical signal;
- and
- a transceiver configured to generate a digital signal vector from the analog signal vector, wherein the transceiver is further configured to generate signal data representing a signal constellation of the digital signal vector,
- wherein the transceiver comprises an adaptive gain equalizer configured to generate an estimate of an angular tilt of the signal constellation and to generate transformed signal data by compensating the signal data for distortion of the signal constellation based on the estimate of the angular tilt.
An optical communication system, the system comprising:
- an optical transmitter configured to provide optical transmissions over an optical network;
- an optical receiver configured to receive an optical signal over the from the optical network and to generate an analog signal vector representing the optical signal;
- and
- a transceiver coupled to the optical transmitter and to the optical receiver, the transceiver comprising:
- an analog front-end configured to convert the analog signal vector into a digital signal vector;
- and
- a digital signal processing circuit configured to generate signal data representing a signal constellation of the digital signal vector;
- wherein the digital signal processing circuit comprises an adaptive gain equalizer configured to generate an estimate of an angular tilt of the signal constellation and to generate transformed signal data by compensating the signal data for distortion of the signal constellation based on the estimate of the angular tilt.
Dependencies are inferred from the claim text.