Systems and methods for relative intensity noise cancelation
AssigneeInphi Corporation
InventorsJamal RIANI, Ilya LYUBOMIRSKY
Life of this patent
Estimating the term…
Abstract
The present invention is directed to communication methods and systems thereof. In a specific embodiment, a noise cancelation system includes a slicer that processes a data stream generates both PAM symbols and error data. An RIN estimator generates RIN data based on the PAM symbols and the error data. A filter removes non-RIN information from the RIN data. The filtered RIN data includes an offset term and a gain term, which are used to remove RIN noise from the data stream. There are other embodiments as well.
Claims20
A noise cancelation system for optical communication, the system comprising:
- an equalizer configured to equalize an incoming data stream to generate an equalized data stream;
- a first slicer configured for generating first data and error data based on the equalized data stream;
- a relative intensity noise (RIN) estimation module configured for generating RIN data based on the first data and the error data, the error data comprising RIN information and non-RIN information;
- a filter for removing the non-RIN information and generating filtered data, the filtered data comprising an offset term and a gain term;
- and
- a compensation module configured to compensate the equalized data stream using the offset term and the gain term.
An optical receiver apparatus comprising:
- a transimpedance module for converting an optical signal to an electrical signal, the electrical signal comprising transimpedance noise;
- an analog-to-digital converter for converting the electrical signal to a digital data stream;
- a first slicer configured to generate data symbols and error data based on the digital data stream;
- an error estimator configured to generate RIN data based at least on the error data, the RIN data comprising RIN information and non-RIN information, the non-RIN information being associated with the transimpedance noise;
- a filter configured to remove non-RIN information an offset term and a gain term;
- and
- a compensation module configured to remove the offset term and the gain term from the digital data stream.
A method for removing relative intensity noise, the method comprising:
- equalizing an incoming data stream to generate an equalized data stream;
- generating first payload symbols and first error data based on the equalized data stream;
- estimating a first RIN data based on the first payload symbols and the first error data;
- removing non-RIN information from the first RIN data to generate a second RIN data, the second RIN data includes an offset term and a gain term;
- and
- generating second payload symbols based on the data signal and the second RIN data.
Dependencies are inferred from the claim text.