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A periodically poled LiNbO<sub>3</sub> (PPLN)-based phase-sensitive amplifier (PSA) has the potential of ultra-low-noise and high-gain optical amplification. For the wideband operation of PSAs in optical fiber transmission, the chromatic dispersion (CD) that causes gain ripples is required to be compensated at the PSA input. We proposed a method to accurately estimate CD from the gain characteristic of a PSA. Estimated CD can be compensated by feed backing it to a spatial light modulator-based CD controller. This paper demonstrates a 2-THz wavelength-division multiplexing (WDM) single-span transmission using a PPLN-based PSA with CD pre-equalization based on our proposed method. The 20-channel WDM signal was modulated with single-polarized 96-Gbaud PS-64QAM, and its net data rate was 400 Gbps&#x002F;channel. 2-THz signal bandwidth (4-THz bandwidth including an idler band) was the widest bandwidth in the fiber transmission using the PSA. We also discuss the system design of phase-sensitively amplified links for a high-symbol-rate and wideband WDM signal.

Wideband PPLN-Based Phase-Sensitively Amplified Transmission of 20-Channel 96-Gbaud WDM Signal