17 Optical back propagation for compensation of dispersion and nonlinearity in fiber optic transmission systems
Xiaojun Liang, Jing Shao and Shiva Kumar
17.1 Introduction
Optical signals propagating in a fiber optic link will be distorted due to fiber dispersion and nonlinearity. Fiber dispersion can be simply compensated using a dispersion compensating fiber (DCF) that has a dispersion coefficient with the opposite sign of that of the transmission fiber (TF). Dispersion compensation can also be achieved by digital signal processing (DSP) using a finite impulse filter (FIR) or fast Fourier transforms (FFTs). However, the compensation of fiber nonlinearity is much more complicated. Lumped compensation of self-phase modulation (SPM) has been ...
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