Inconsistency measurement between two branches of LiNbO3 integrated optic Y-junction

• DOI: 10.1016/j.optcom.2016.02.049
• Publication Date: 2016-03-01T20:49:03Z
• Authors: Chuang Li; Yonggui Yuan; Jun Yang; Zhangjun Yu; Feng Peng; Bing Wu; Yu Zhang; Libo Yuan; Yong Hua; Ping Shu
• Keywords: Integrated Optics

Abstract We investigate the inconsistency of the polarization related performance between two branches of a packaged LiNbO 3 integrated optic Y-junction. An optical path tracking method is proposed to simplify the description of polarization light transmission behavior in packaged Y-junction. By developing a simple but practical fiber test system based on white light interferometry, the interferograms representing different branches of Y-junction are detected and distinguished accurately. The inconsistencies of performance including not only conventional parameters such as polarization extinction ratio of LiNbO 3 chip and crosstalk at the joint points between polarization-maintaining pigtails and chip, but also birefringence of LiNbO 3 chip and power ratio of Y-junction are obtained with only one-time measurement. It is analyzed theoretically and verified experimentally for complete parameters of a packaged Y-junction. Besides, the static and dynamic measurement results reveal that performance inconsistency for both branches of Y-junction can be effectively evaluated with high accuracy. The inconsistency investigation is highly beneficial in real-time monitoring the inconsistency between two branches of Y-junction and to filtrate qualified Y-junctions.