Open AccessIntegrated-optic current sensors with a multimode interference waveguide device
Author(s) -
Sung-Moon Kim,
Woo-Sung Chu,
Sang-Guk Kim,
MinCheol Oh
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.24.007426
Subject(s) - optics , interferometry , waveguide , interference (communication) , demodulation , multi mode optical fiber , polarization (electrochemistry) , materials science , physics , optoelectronics , optical fiber , computer science , telecommunications , channel (broadcasting) , chemistry
Optical current sensors based on polarization-rotated reflection interferometry are demonstrated using polymeric integrated optics and various functional optical waveguide devices. Interferometric sensors normally require bias feedback control for maintaining the operating point, which increases the cost. In order to resolve this constraint of feedback control, a multimode interference (MMI) waveguide device is integrated onto the current-sensor optical chip in this work. From the multiple outputs of the MMI, a 90° phase-shifted transfer function is obtained. Using passive quadrature demodulation, we demonstrate that the sensor could maintain the output signal regardless of the drift in the operating bias-point.