Cycle slip compensation in a coherent receiver
AssigneeInphi Corporation
InventorsMario Alejandro CASTRILLON, Damian Alfonso MORERO, Mario Rafael HUEDA
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Abstract
A receiver architecture and method recovers data received over an optical fiber channel in the presence of cycle slips. In a first cycle slip recovery architecture, a receiver detects and corrects cycle slips based on pilot symbols inserted in the transmitted data. In a second cycle slip recovery architecture, a coarse cycle slip detection is performed based on pilot symbols and a cycle slip position estimation is then performed based on carrier phase noise. The receiver compensates for cycle slips based on the position estimation.
Claims20
A data recover system comprising:
- a carrier phase recovery block configured to output a sequence of frames based on a received signal, each frame comprising a data symbol block and a pilot symbol block, the pilot symbol block comprising one or more pilot symbols, the sequence of frames including at least a target frame and a subsequent frame, the carrier phase recover block comprises a carrier phase estimator for determining a phase estimate;
- a coarse estimator configured to determine a coarse estimation of a cycle slip based on the pilot symbols;
- a fine estimator configured to determine a fine estimation of the cycle clip based on the phase estimate;
- and
- a phase correction block configured to correct the cycle slip based on the coarse estimation and the fine estimation.
A receiver system comprising:
- an analog front end interface for processing a received signal;
- a carrier phase recovery block configured to output a sequence of frames based on the received signal, each frame comprising a data symbol block and a pilot symbol block, the pilot symbol block comprising one or more pilot symbols, the sequence of frames including at least a target frame and a subsequent frame, the carrier phase recover block comprises a carrier phase estimator for determining a phase estimate;
- a cycle slip detection block configured to determine a coarse estimation of a cycle slip based on the pilot symbols, cycle slip detection block further being configured to determine a fine estimation of the cycle clip and the coarse estimation of cycle slip based the phase estimate;
- and
- a phase correction block configured to correct the cycle slip based on the coarse estimation and the fine estimation.
A receiver system comprising:
- an optical front end for receiving an optical signal;
- an analog front end for converting the optical signal to a received signal;
- a digital signal processor (DSP) for comprising the received signal, the DSP including a data recovery module for correcting the received signal;
- and
- a demodulator configured to demodulate the received signal;
- wherein the data recovery module is configured to:
- output a sequence of frames based on a received signal, each frame comprising a data symbol block and a pilot symbol block, the pilot symbol block comprising one or more pilot symbols, the sequence of frames including at least a target frame and a subsequent frame,
- determine a phase estimate;
- determine a coarse estimation of a cycle slip based on the pilot symbols;
- determine a fine estimation of the cycle clip and the coarse estimation of cycle slip based the phase estimate;
- and
- correct the cycle slip based on the coarse estimation and the fine estimation.
Dependencies are inferred from the claim text.