期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 20, 期 13-16, 页码 1387-1389出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2008.926832
关键词
fiber attenuator; Mach-Zehnder interferometer; Michelson interferometer; refractive index (RI) sensor
资金
- Natural Science and Engineering Council of Canada [RGPIN 311817-06]
- Canadian Institute for Photonic Innovations and Photonics Research Ontario
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 similar to 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.
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