Patent ID: 8792789

Claim:
An optical receiver with a chromatic dispersion (CD) compensation system, the receiver comprising: an optical front end having a network interface to receive an optical signal, the optical front end converting the optical signal to an analog electrical signal supplied at an output; an analog-to-digital converter (ADC) having an input to accept the analog electrical signal and an output to supply a digital signal at an initial sampling frequency F 1 ; an interpolation device having an input to accept the digital signal and an input to accept a clock signal, the interpolation device correcting for clock and phase sampling errors in the digital signal and supplying a phase corrected digital signal at an output; a de-skewing device having an input to accept the phase corrected digital signal, the de-skewing device correcting for I/Q modulation balance and supplying a de-skewed digital signal at an output; a first sampling device having an input to accept the de-skewed digital input signal, and an output to supply a resampled digital input signal at a sampling frequency F 2 ; a CD compensation filter having an input to accept the resampled digital signal, a zero-forcing filter calculated with a number of taps (n) required to nullify a chromatic dispersion frequency response of an optical channel, the zero-forcing filter using a filter mechanism selected from a group consisting of using tap values represented by a finite quantization set and using a truncated number of taps (n−x), where x is an integer greater than 0, the CD compensation filter having an output to supply a CD compensated signal; a second sampling device having an input to accept the CD compensated signal and an output to supply a resampled CD compensated signal at a sampling frequency F 3 ; and, an adaptive equalizer having an input to accept the resampled CD compensated signal and an output to supply an equalized signal.