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A promising nonlinearity-tolerant OSNR monitoring technique based on correlation function between neighboring symbols as well as polarizations is proposed. The technique has the maximum estimation error of 1.28dB for 100-Gb/s PM-QPSK-Nyquist-WDM coherent system and is insensitive to channel launch powers and channel numbers.
We propose a joint multi-polarization-effect equalization scheme using two Kalman filters in a faster than Nyquist-WDM transmission system, which can cope with state of polarization (SOP) tracing, polarization demultiplexing, equalization for polarization dependent loss (PDL) and polarization mode dispersion (P MD).
We propose and demonstrate a new data-aided in-band optical-signal-to-noise ratio (OSNR) monitoring method, which employs the periodic property of a specially designed short training sequence to differentiate the signal power from noise and is proved to be insensitive to the first-order polarization mode dispersion (PMD). This method is verified in a typical 112-Gb/s polarization multiplexed-quadrature...
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