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We investigate Nyquist spectral shaping using two-channel-interleaved DAC with zero-order holding for Nyquist-WDM 64QAM systems, which requires FIR filter with 57 taps, bandwidth of 0.4–0.6 times of the symbol rate, and DAC resolution >7 bits.
We investigate three EDFA only amplification architectures for 100G unrepeatered transmission. With > 4 dBQ margin, pre-amplifier only, booster only and both booster and pre-amplifier amplifications can achieve 130, 150 and 220 km reach respectively.
We propose a fast convergence single-stage adaptive frequency domain algorithm for simultaneously compensating CD&DMGD in few-mode fiber system. The proposed algorithm can increase the convergence speed by 51% with 8% complexity increase.
We show that the complexity of the receiver-side dynamic butterfly equalizer can be significantly reduced by incorporating a matched filter in the static chromatic dispersion equalizer for root-raised-cosine Nyquist spectrally shaped systems.
We proposed a PMD monitoring/compensation method in frequency domain for coherent system. With 15 ps of average DGD, the PMD induced penalty for 100-Gbit/s QPSK system is reduced by 9 dB at symbol-error-ratio of 10−3.
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