Multi-channel phase squeezing in a PPLN-PPLN PSA

Benjamin James Puttnam, Dániel Mazroa, Satoshi Shinada +1 more

Benjamin James Puttnam, Áron Szabó, Dániel Mazroa +2 more

We investigate phase squeezing of up to four signal channels in a non-degenerate phase-sensitive amplifier constructed from periodically-poled-lithium-niobate waveguides and observe that additional channels have little impact the phase squeezing performance.

Nguyen Ba An

Masaki Asobe, Takeshi Umeki, Hirokazu Takenouchi +1 more

Phase-sensitive amplifiers (PSA) using periodically poled (PPLN) LiNbO₃ waveguides are promising as low-noise optical amplifiers. However, it is difficult to realize in-line operation for multi-level phase modulated signals using a PPLN based PSA with the conventional configuration. In this paper, we report a PPLN based in-line PSA that can regenerate quadrature phase shift keying (QPSK) signals. Multi-stage frequency mixing in a multiple quasi-phase matched LiNbO₃waveguide allows carrier phase recovery from a QPSK signal. Non-degenerate parametric amplification enables the phase-sensitive amplification of a QPSK signal. Amplitude and phase regeneration is examined utilizing gain saturation and phase squeezing capability.

H. A. Haus

Benjamin James Puttnam, Dániel Mazroa, Satoshi Shinada +1 more

We investigate the phase squeezing characteristics of a non-degenerate PPLN-PSA. We show that the level of phase squeezing varies with the phase-sensitive-dynamic-range and demonstrate regeneration of a distorted BPSK signal, despite net signal attenuation.