Abstract
An in-band optical signal-to-noise-ratio (OSNR) monitoring technique that utilizes the polarization
orthogonality and heterodyne mixing is proposed. The technique is not only insensitive to polarization-mode
dispersion but also robust to nonlinear polarization scattering induced by interchannel cross-phase modulation.
Moreover, the technique places no special requirements on the signal properties, such as modulation format and bit
rate. The monitoring technique is demonstrated experimentally in both linear and nonlinear systems.
© 2007 IEEE
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