Hardware Implementation of Chromatic Dispersion Compensation in Finite Fields.

Chromatic dispersion in long-haul optical fibers distorts signal pulses, thus limiting its transmission capacity. This paper proposes an overlap-and-saving aided compensation algorithm in finite fields based on the Fermat number transform (FNT) for long-haul optical communication systems. The complexity of the original equalization architecture is greatly reduced by introducing the irrational-number kernel and the operational logic in diminished-1 number system. For signal-mode fiber communication scenarios, Monte-Carlo simulation and application specific integrated circuit (ASIC) implementation with SMIC 65 nm 1P9M CMOS technology exhibit that the proposed architecture obtains potential advantage (5.74 × gain in area efficiency) over the conventional fast Fourier transform (FFT) based architecture with lower quantization bitwidth while maintaining acceptable performance.