Takeshi Umeki

Multi-span transmission using phase and amplitude regeneration in PPLN-based PSA

We demonstrated that impairments caused by chromatic dispersion, fiber nonlinearity, and the ASE of optical amplifiers were effectively suppressed using in-line PSA repeaters. Over 3200-km transmission of 28-Gb/s BPSK signal was achieved without dispersion compensation.

Simultaneous nonlinearity mitigation in 92 × 180-Gbit/s PDM-16QAM transmission over 3840 km using PPLN-based guard-band-less optical phase conjugation

We experimentally demonstrated the simultaneous nonlinearity mitigation of PDM-16QAM WDM signals using complementary-spectrally-inverted optical phase conjugation (CSI-OPC). We achieved reserved-band-less, guard-band-less, and polarization independent OPC based on periodically poled LiNbO3 waveguides. By employing the CSI-OPC, 2.325-THz-band (93 × 25 GHz) complementary spectral inversion was achieved while retaining the original WDM bandwidth. A Q2-factor improvement of over 0.4 dB and a 5120 km transmission with a Q2-factor above the FEC limit were confirmed using a 10-channel WDM transmission at the signal band center and signal band edge. We then demonstrated the mitigation of the nonlinear impairments in a 3840 km long-haul WDM signal transmission for all 92-channel 180-Gbit/s PDM-16QAM quasi-Nyquist-WDM signals.

Phase Sensitive Amplifiers Using PPLN Waveguides and Their Applications

Phase sensitive amplifiers are attracting a lot of interest because of their low noise characteristics and phase noise reduction capability. In this talk, we will review recent advances in PSA using periodically poled LiNbO3 waveguide.