Open AccessDoubled temperature measurement range for a single micro-ring sensor
Author(s) -
Xin Li,
Lu-na Wang,
Shu Guo,
Zhiquan Li,
Yang Ming
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.154209
Subject(s) - free spectral range , resonator , waveguide , silicon on insulator , materials science , optics , ring (chemistry) , refractive index , coupling (piping) , atmospheric temperature range , silicon , optoelectronics , physics , chemistry , organic chemistry , meteorology , metallurgy
A novel SOI (silicon on insulator) temperature sensor based on a U-shaped waveguide-coupled single micro-ring is proposed in this paper. Refractive index and length of the temperature-sensing part will change as the temperature changes, leading to the shift of the output spectrum of the sensor. The transfer function of the U-shaped waveguide coupled with a single micro-ring is obtained based on the theory of coupling modes and transfer matrix method. And we have studied the output spectrum properties of the system from different temperature-sensing parts. Results show that the whole structure of U-shaped waveguide coupled with the single micro-ring proves to be the best temperature-sensing part as the output spectrum with no spurious modes and a deep extinction ratio of 31 dB. Compared with the traditional two waveguides coupled with a single micro-ring resonator, when the distance between the two coupling points of the U-shaped waveguide is an integer multiple of circumference of the micro-ring, the free spectrum range (FSR) can be expanded to 56 nm, the sensitivity can achieve 89.2 pm/℃, and the measurement range be 298720 K, achieving a high temperature measurement of SOI micro-ring resonator.