Signal acquisition in a coherent optical receiver
AssigneeNortel Networks Limited
InventorsChandra Bontu, Kim B. Roberts, Han Sun, Edgar Velez, Kuang Tsan Wu
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Abstract
A method and system for initializing a coherent optical receiver. Upon detection of an optical signal, a multi-bit digital sample stream of the optical signal is digitally processed to initialize each one of a plurality of adaptive control blocks of the coherent optical receiver. The adaptive control blocks include at least a dispersion compensation block and a clock recovery block. The dispersion compensation block is initialized before initializing the clock recovery block.
Claims34
In an optical communications system including an optical link terminated by a coherent optical receiver, a method of initializing the coherent optical receiver comprising steps of:
- detecting an optical signal;
- and
- digitally processing a multi-bit digital sample stream of the optical signal to find receiver parameters which, when downloaded to a dispersion compensator of the coherent optical receiver, compensate link impairments with sufficient accuracy that residual distortions are within a pull-in range of at least one adaptation loop of the receiver;
- downloading the found receiver parameters to the dispersion compensator and processing the multi-bit digital sample stream using the dispersion compensator;
- and
- supplying an output of the dispersion compensator to the at least one adaptation loop of the receiver;
- wherein the at least one adaptation loop comprises a clock recovery block of the receiver.
Dependencies are inferred from the claim text.