Dispersion tolerant 21.4-Gb/s DQPSK using simplified Gaussian Joint-Symbol MLSE

We experimentally apply different MLSE schemes to 21.4-Gb/s NRZ-DQPSK. joint- symbol MLSE (JS-MLSE) of the in-phase and quadrature components after balanced detection gives best performance, even with a simplified Gaussian model for the MLSE channel estimation.

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