Chromatic Dispersion Mitigation in Single Carrier High Speed Coherent Optical Communication Using Digital Signal Processing Techniques

摘要

Optical fiber networks have been emerged to be the backbone of global communication infrastructure in present world. But, they are currently experiencing an unprecedented level of stress in order to meet the demand of increasing bandwidth-hungry applications. Moreover signals are frequently subjected to distortion due to optical fiber impairments while being propagating through a fiber optic cable. This paper demonstrates digital signal processing (DSP) based chromatic dispersion (CD) estimation and mitigation technique for single carrier high speed coherent optical communications. Coherent detection permits the optical field parameters (amplitude, phase and polarization) to be available in the electrical domain enabling new opportunity for multi-level signaling (M-ary PSK and M-ary QAM modulation). That is why Coherent detection employing QAM modulation formats have become one of the most promising technologies for next generation high speed transmission systems due to the high po wer and spectral efficiencies. In recent days, the realizations of DSP algorithms for estimating and mitigating the chro matic dispersion in the coherent transmission systems are the most attractive investigations. In this paper, CD estimation technique has been improved using DSP algorithm and optimal OSNR, BER have been ach ieved