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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 and investigate a new scheme to realize all-optical logic gates using a single I/Q modulator with direct detection. Both intensity and phase of the optical signal are utilized to represent the four different states of two binary inputs, whereas direct detection is used to map the four states to the corresponding binary output. This structure is very simple and has the potential to reach...
We proposed a new scheme of combination of PMD compensator and a phase regenerator to mitigate the PMD penalty in 40-Gbit/s DPSK system. The system performance is effectively improved after both compensation and regeneration.
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