Circuit for multi-path interference mitigation in an optical communication system
AssigneeInphi Corporation
InventorsBenjamin P. SMITH, Jamal RIANI, Sudeep BHOJA, Arash FARHOODFAR, Vipul BHATT
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Abstract
A circuit and method for mitigating multi-path interference in direct detection optical systems is provided. Samples of an optical signal having a pulse amplitude modulated (PAM) E-field are processed by generating a PAM level for each sample. For each sample, the sample is subtracted from the respective PAM level to generate a corresponding error sample. The error samples are lowpass filtered to produce estimates of multi-path interference (MPI). For each sample, one of the estimates of MPI is combined with the sample to produce an interference-mitigated sample.
Claims20
An apparatus comprising:
- a slicer that,
- receives a plurality of samples of an optical signal having a pulse amplitude modulated (PAM) E-field, and
- estimates a PAM level of a sample in the plurality of samples;
- an error generator that generates an error sample from the sample and the estimated PAM level;
- a filter that filters the error sample for the sample and error samples for the other samples in the plurality of samples to produce estimates of multi-path interference (MPI);
- and
- a combiner that combines one of the estimates of MPI with the sample to produce an interference-mitigated sample.
Dependencies are inferred from the claim text.