Abstract:A low-complexity adaptive equalizer including equalization, rotation of state of polarization (RSOP) tracking, and phase recovery is proposed for coherent optical polarization-division-multiplexing (PDM) quadrature phase-shifting keying (QPSK) transmission system. A conventional N-tap 2x2 butterfly finite impulse response filter is simplified to two N-tap filters and a 1-tap 2x2 filter. Two N-tap filters could compensate for inter-symbol interference and residual chromatic dispersion based on the same error co… Show more
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