Open AccessФоторефрактивная подстройка коэффициента деления интегрально-оптического направленного X-ответвителя на подложке ниобата лития
Author(s) -
М.В. Парфенов,
А.В. Тронев,
И.В. Ильичев,
П.М. Агрузов,
А.В. Шамрай
Publication year - 2019
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2019.05.47386.17627
Subject(s) - photorefractive effect , extinction ratio , power dividers and directional couplers , coupling (piping) , optics , materials science , sensitivity (control systems) , extinction (optical mineralogy) , optical power , excitation , wavelength , physics , electronic engineering , engineering , laser , quantum mechanics , metallurgy
The possibility of correcting the power coupling ratio of an integrated optical directional X-coupler upon excitation of a local photorefractive response in the substrate material (LiNbO_3) has been analyzed. The X-coupler operation has been numerically simulated, and the regions of its maximum sensitivity to photorefraction have been determined. The correspondence between the calculated and experimental data has been obtained. The maximum correction value of the coupling ratio is 1–2%. The photorefractive correction of the coupling ratio has been used to increase the extinction ratio of a Mach–Zehnder modulator to 47 dB.