Fiber nonlinearity suppression in fiber-optic transmission systems using an optical quadratic phase pre-compensation method
In this paper, we propose, simulate and experimentally demonstrate a convenient pre-compensation method, which is capable of mitigating fiber nonlinearity in dense wavelength-division-multiplexed long-haul high-speed systems. From nonlinear Schrdinger equation, we deduce that an optical signal with quadratic phase will have better nonlinear suppression ability than other phase pre-compensation methods. In our pre-compensation method, before being launched into fiber, each transmitted wavelength is modulated by a phase modulator, which is driven by a periodic parabolic electric driving signal. Thus, each channel will have a quadratic phase. Both of the simulations and experimental results show that the fiber Kerr nonlinearity can be reduced effectively and the BER can be improved by two orders of magnitude.
pre-compensation nonlinear schrdinger equation dwdm fiber-optic system nonlinear phase shift linear frequency chirp