Open AccessDigital multi-channel stabilization of four-mode phase-sensitive parametric multicasting
Author(s) -
Lan Liu,
Zhi Tong,
Andreas O. J. Wiberg,
Bill P.-P. Kuo,
Evgeny Myslivets,
Nikola Alić,
S. Radic
Publication year - 2014
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.018379
Subject(s) - optics , dpll algorithm , parametric statistics , phase (matter) , physics , broadband , signal (programming language) , interferometry , phase modulation , phase noise , noise (video) , channel (broadcasting) , phase locked loop , computer science , materials science , telecommunications , statistics , mathematics , quantum mechanics , artificial intelligence , image (mathematics) , programming language
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.