Low power low complexity chromatic dispersion compensation

摘要

Methods, systems, and devices are described for filtering data from an optical signal to compensate for chromatic dispersion in an optical path. Samples of different polarizations are filtered in the frequency domain with a matched filter by time-sharing a conversion module. The conversion module first converts a set of samples to the frequency domain for filtering when in a Fast Fourier Transform (FFT) configuration and then converts the filtered set of samples back to the time domain when in an Inverse FFT (IFFT) configuration. The size of the FFT in the FFT configuration and of the IFFT in the IFFT configuration is the same as the size of the samples being processed by the conversion module to enable both configurations to be based on a set of constant multipliers. Both configurations may be based on a pipelined architecture to sequentially process the samples in an efficient manner.

主权项

1. A method for filtering data from an optical signal, comprising:
converting to the frequency domain a current set of samples of one polarization utilizing a module configured in a Fast Fourier Transform (FFT) mode, the FFT mode configuration having constant multipliers, and a size of the current set of samples matching a size of the FFT in the FFT mode configuration; filtering the converted current set of samples to compensate for chromatic dispersion in an optical path while converting to the frequency domain a next set of samples of a different polarization utilizing the module in the FFT mode; converting to the time domain the filtered current set of samples utilizing the same module configured in an Inverse Fast Fourier Transform (IFFT) mode while filtering the converted next set of samples to compensate for chromatic dispersion in the optical path, the IFFT mode configuration having the same constant multipliers as the FFT mode configuration, and a size of the filtered current set of samples matching a size of the IFFT in the IFFT mode configuration; and converting to the time domain the filtered next set of samples utilizing the module in the IFFT mode.