期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 26, 期 21, 页码 2185-2188出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2014.2349941
关键词
Optical fiber sensors; optical filters; multimode interference devices and strain and temperature measurement
资金
- Natural Science and Engineering Research Council of Canada
We designed and demonstrated a single-mode-multimode-single-mode fiber filter using a step-indexed large-mode-area fiber, which has a critical wavelength at 1046 nm. A broad transmission peak or trough at 1046 nm is very sensitive to strain or temperature variation. The interference fringes on either side of the critical wavelength show blue or red shift, respectively, when the filter is subjected to strain and temperature changes. We simulated the transmission spectrum based on the interference of two modes, LP01 and LP02, and their propagation constant difference. The simulated spectrum matches reasonably well with the experimental spectrum. The filter can be used as a variable output coupler or for fiber optic sensors.
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