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Nonlinear effects have been considered as the major limitations in coherentoptical (CO) fiber transmission system. DSP based CO receiver with digitalbackpropagation (DBP) method has recently facilitated the compensation of fibernonlinear impairments as well as compensating dispersion of optical fiber. Inthis paper, a comprehensive design is presented for circular-polarizationdivision multiplexed (CPDM) 8-quadrature amplitude modulation (8-QAM) with DSPbased CO receiver for the fiber optic communication (FOC) system to investigatethe impact of nonlinearities. We have examined the performance of nonlinearitycompensating DSP based CO receiver with DBP method and demonstrated that it canbe effectively employed to mitigate the intrachannel nonlinearities in CPDM8-QAM FOC system over 800-km SSMF link. By effectively compensating the fibernonlinearities, we analyze the performance of bit error rate (BER), opticalsignal to noise ratio (OSNR), optimum launch power, and investigate the linkmargin by evaluating OSNR margin for a specific launch power. Moreover, a CPDMtechnique helps as a very suitable means of maximizing the link capacity aswell as enhancing the spectral-efficiency (SE) of the FOC system.

journal of optics/journal of optics (new delhi. print)

Nonlinearity Compensation and Link Margin Analysis of 112-Gbps  Circular-Polarization Division Multiplexed Fiber Optic Communication System  using a Digital Coherent Receiver over 800-km SSMF Link