Abstract

In a single-mode-fiber probe type of interferometer, the effect of fiber coupling on the sensing performance is theoretically comprehensively investigated in order to analyze and improve the achievable sensing accuracy for nanometric sensing. In both direct and via-lens coupling schemes for the interferometer, the scale factors to deduce optical path length change from the measured phase are analytically and numerically examined in terms of deviation from the plane wave assumption of conventional use. It is manifested that the scale factor deviation is of considerable magnitude in the case of direct coupling, but, by the incorporation of suitable collimating optics for coupling, the degree of deviation can be drastically reduced to as small as typically ${10}^{- 8}$, supporting achievement of ultrahigh accuracy such as picometer in displacement sensing. The effect of reflector tilting is also addressed.

© 2020 Optical Society of America

Anti-external interference sensor based on cascaded side-coupled photonic crystal nanobeam cavities for simultaneous sensing of the refractive index and temperature

Yongqin Wu, Fujun Sun, Shuo Yang, Zhongyuan Fu, Chao Wang, and Huiping Tian
J. Opt. Soc. Am. B 37(12) 3850-3856 (2020)

Strain and temperature discrimination based on a Sagnac interferometer with three sections of high birefringence fibers

Zhichao Ding and Zhongwei Tan
J. Opt. Soc. Am. B 37(2) 440-444 (2020)

High-sensitivity refractometric sensing with an indirectly coupled active and passive microresonator-waveguide system

Zhao-Hui Peng, Chun-Xia Jia, and Yu-Qing Zhang
J. Opt. Soc. Am. B 37(4) 1083-1089 (2020)

Coupled-mode theory for microresonators with quadratic nonlinearity

Dmitry V. Skryabin
J. Opt. Soc. Am. B 37(9) 2604-2614 (2020)

Vector modulation instability in birefringent graded-index multimode fibers

Amira S. Ahsan and Govind P. Agrawal
J. Opt. Soc. Am. B 38(1) 201-208 (2021)