Patent ID: 7613402

Claim:
A method of signal processing, comprising: convening an optical signal into an electrical signal having an amplitude corresponding to optical power of the optical signal; and sampling the electrical signal using a sampling window to generate a bit sequence corresponding to the optical signal, wherein: the sampling window has a width; the electrical signal has a series of waveforms comprising first and second pluralities of waveforms, wherein each waveform of the first plurality represents a binary “0” and each waveform of the second plurality represents a binary “1”; each waveform is integrated over the sampling window width to generate an integration result; the integration result is compared with a decision threshold value to generate a corresponding bit value; the sampling window width is selected to be less than a bit length in the electrical signal in order to reduce contribution of the second plurality of waveforms into integration results corresponding to the first plurality of waveforms; the optical signal is an optical duobinary signal; and the sampling window width is less than about 25% of a bit length.