Wideband Optical Parametric Amplification of 8.375-THz WDM Signal Using Cascaded PPLN Waveguides with Reused Pump Light

We propose a configuration for wideband optical parametric amplifier (OPA) using cascaded periodically poled LiNbO 3 (PPLN) waveguides. These PPLN waveguides have different phase-matching characteristics by controlling the temperature of each waveguide, and thus, input signal is amplified complementarily. Pump light shared across As result, pump-power-efficient gain bandwidth extension can be achieved. numerically calculate spectrum proposed show that optimization state 2 nd modules suppress generation excessive gain, resulting in flat spectrum. experimentally demonstrate an 8.7-THz amplification (1545.32–1618.86 nm) with >15-dB lower frequency band OPA. also conduct simultaneous experiments 67-channel 125-GHz-spaced 120-Gbaud WDM over 8.375 THz configuration.