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We review the capabilities of phase sensitive amplifiers based on periodically poled LiNbO3 (PPLN) waveguides for optical communication. Specifically, we discuss their unique low noise amplification, phase and amplitude regeneration in multi-span transmissions, and multilevel phase coding signal amplification.
We devised an optical modulator with a high field-response linearity, which is suitable for a DAC-based multilevel coherent transmitter. An advantage over a conventional MZM in terms of the linearity-loss tradeoff was demonstrated.
We investigate long-haul WDM transmission using 538Gb/s PDM-64QAM single-carrier frequency-division-multiplexing (SC-FDM) signal with pilot tone. Assuming 20% FEC overhead, the longest transmission distance of 1200km at the spectral efficiency of 8.96b/s/Hz is achieved.
We demonstrate hybrid 40-Gb/s and 100-Gb/s PDM-QPSK DWDM transmission using real-time DSP in 580-km DSF-installed field testbed. The nonlinear crosstalk penalty due to the hybrid transmission of less than 0.5 dB is confirmed.
We succeed in the long-haul (1,280km) transmission of a 120-Gb/s PDM 64-QAM signal. The transmission distance was extended from 800 km to 1,280 km by a multi-stage nonlinear compensation technique that mitigates the intra-channel nonlinearities.
A novel compact-spectrum RZ signal is proposed, its bandwidth is approximately twice the bit-rate. It is generated by a single-stage Mach-Zehnder modulator with 2:1 multiplexing function. 50 GHz-spaced 8times20-Gbit/s DWWM transmission is realized
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