Pilot aided OSNR monitoring in optical Nyquist transmission system

A method of using pilot-tone to monitor optical signal-to-noise ratio (OSNR) is proposed in the paper. High-order statistical moments of pilot component are utilized to evaluate the noise level of the transmitted optical signals. This method of OSNR monitoring has the advantage of insensitivity to chromatic dispersion (CD) and polarization mode dispersion (PMD). Simulations are carried out in optical Nyquist transmission system. It is shown that the method has 1 dB monitoring accuracy over a wide OSNR range from 5 dB to 25 dB.

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