论文信息 - Single-Mode Fiber Refractive Index Sensor Based on Core-Offset Attenuators

Single-Mode Fiber Refractive Index Sensor Based on Core-Offset Attenuators

Mach-Zehnder and Michelson interferometers using core-offset attenuators were demonstrated. As the relative offset direction of the two attenuators in the Mach-Zehnder interferometer can significantly affect the extinction ratio of the interference pattern, single core-offset attenuator-based sensors appear more robust and repeatable. A novel fiber Michelson interferometer refractive index (RI) sensor was subsequently realized by a single core-offset attenuator and a layer of ~ 500-nm gold coating. The device had a minimum insertion loss of 0.01 dB and maximum extinction ratio over 9 dB. The sensitivity (0.333 nm) of the new sensor to its surrounding RI change (0.01) was found to be comparable to that (0.252 nm) of an identical long period gratings pair Mach-Zehnder interferometric sensor, and its ease of fabrication makes it a low-cost alternative to existing sensing applications.

[1] Libo Yuan,et al. In-fiber integrated Michelson interferometer. , 2006, Optics letters.

[2] Alan D. Kersey,et al. Analysis of the response of long period fiber gratings to external index of refraction , 1998 .

[3] A. Zhang,et al. Fiber-taper seeded long-period grating pair as a highly sensitive refractive-index sensor , 2005, IEEE Photonics Technology Letters.

[4] Kin Seng Chiang,et al. Analysis of etched long-period fibre grating and its response to external refractive index , 2000 .

[5] Pieter L. Swart,et al. Long-period grating Michelson refractometric sensor , 2004 .

[6] S. Yam,et al. Refractive index sensor based on an abrupt taper Michelson interferometer in a single-mode fiber. , 2008, Optics letters.

[7] Zhaobing Tian,et al. Refractive Index Sensing With Mach–Zehnder Interferometer Based on Concatenating Two Single-Mode Fiber Tapers , 2008, IEEE Photonics Technology Letters.