Mitigation of chromatic dispersion by all pass filter

Dispersion in a single mode fiber is the bottleneck of long haul optical communication systems, which limits the bit rate and repeater-less distance. Chromatic dispersion (CD) of a single mode fiber (SMF) is an important aspect in a long-haul optical communication system. Chromatic dispersion leads to inter-symbol interference and degrades the quality of the signal. All-pass filters (APF's) are devices that allow phase correction or equalization without introducing any amplitude distortion. All pass filters (APFs) are used in dispersion compensation which is the foremost requirement in an optical fiber link.