Mitigation of nonlinear impairments using DSP for 2×1 100 Gbps PDM-QPSK
Keywords:
PDM- QPSK (Polarization Division Multiplexed Quadrature Phase Shift Keying), DSP (Digital Signal Processing), NLC(Nonlinear compensator).Abstract
High speed data transmission in optical fiber limited by the linear and nonlinear impairments. Here, we
have demonstrated the simulation of coherent 100 Gbps PDM-QPSK. Nonlinearity is more dominant factor to limit
the performance of the high speed optical communication. Nonlinearity of system introduce in propagation due to
nonlinear behavior of the optical signal because it always follow the Non linear Schrödinger equation in fiber during
propagation. It is possible to compensate the linear and nonlinear impairments by DSP (Digital Signal Processing)
algorithm.. In this paper we analyze the effect of the nonlinearity based on DSP module. Here we measure the
performance of 2×1 100 Gbps PDM-QPSK systems with Nonlinear compensator (NLC) and without NLC. The
performance of system is approximately same for with and without NLC at shorter distance. But, for long distance
performance of system is degraded without NLC. Nonlinear behavior of optical signal combat by split step Fourier
method which is part of Back propagation.
