Open AccessQuasi-distributed birefringence dispersion measurement for polarization maintain device with high accuracy based on white light interferometry
Author(s) -
Zhangjun Yu,
Jun Yang,
Yonggui Yuan,
Chuang Li,
Liang Shi,
Lu Hou,
Feng Peng,
Bing Wu,
Jianzhong Zhang,
Zhihai Liu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.001587
Subject(s) - optics , birefringence , interferometry , polarization (electrochemistry) , dispersion (optics) , physics , refractive index , polarization mode dispersion , materials science , chemistry
A white light temporal interferometric technique for measurement of the quasi-distributed birefringence dispersion (BD) in a polarization maintain (PM) device with high accuracy based on weighted least square (WLS) method is presented. It is verified theoretically and experimentally that the accuracy of WLS method and the conventional ordinary least square (OLS) method both are proportional to the signal-to-noise ratio (SNR) of interferogram, whereas the WLS method holds a higher scaling factor because it is more suitable for heteroscedastic model that has unequal error variance. The experiment results show a repeatability of ~4.6 × 10(-5) ps/nm @ 1550 nm with WLS method for 100 sets of data, and ~4.3 × 10(-4) ps/nm with OLS method, for an interferogram with SNR of 30 dB. Besides, WLS method without iterative operation is carried out by using power spectrum of interferogram as weight value. The feasibility of this technique is demonstrated by distinguishing the quasi-distributed BD of every part for a packaged Y-waveguide with two 1m-long PM pigtails.