title: Digital multi-channel stabilization of four-mode phase-sensitive parametric multicasting.
abstract: Stable four-mode phase-sensitive (4MPS) process was investigated as a means to enhance two-pump driven parametric multicasting conversion efficiency (CE) and signal to noise ratio (SNR). Instability of multi-beam, phase sensitive (PS) device that inherently behaves as an interferometer, with output subject to ambient induced fluctuations, was addressed theoretically and experimentally. A new stabilization technique that controls phases of three input waves of the 4MPS multicaster and maximizes CE was developed and described. Stabilization relies on digital phase-locked loop (DPLL) specifically was developed to control pump phases to guarantee stable 4MPS operation that is independent of environmental fluctuations. The technique also controls a single (signal) input phase to optimize the PS-induced improvement of the CE and SNR. The new, continuous-operation DPLL has allowed for fully stabilized PS parametric broadband multicasting, demonstrating CE improvement over 20 signal copies in excess of 10 dB.
authors.forename: Lan
authors.initials: L
authors.lastname: Liu
authors.forename: Zhi
authors.initials: Z
authors.lastname: Tong
authors.forename: Andreas O J
authors.initials: AO
authors.lastname: Wiberg
authors.forename: Bill P P
authors.initials: BP
authors.lastname: Kuo
authors.forename: Evgeny
authors.initials: E
authors.lastname: Myslivets
authors.forename: Nikola
authors.initials: N
authors.lastname: Alic
authors.forename: Stojan
authors.initials: S
authors.lastname: Radic