Digital multi-channel stabilization of four-mode phase-sensitive parametric multicasting

作者：Liu Lan^*; Tong Zhi; Wiberg Andreas O J; Kuo Bill P P; Myslivets Evgeny; Alic Nikola; Radic Stojan

来源：Optics Express, 2014, 22(15): 18379-18388.

DOI：10.1364/OE.22.018379

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.

• 出版日期2014-7-28