Acta Optica Sinica, Vol. 38, Issue 9, 0906003 (2018)
Dual Resonance and Dual-Parameter Sensor of Few-Mode Fiber Long Period Grating
Guo Yancheng*, Liu Yange*, Wang Zhi, and Yao Zhuokun
- Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, China
The phenomenon of dual resonance coupling exists in few-mode long period grating coupled between core modes LP01 and LP11. The two resonant dips drift to opposite bands as temperature or strain increases. We research the mechanism of dual resonance from theory and experiment, and design a dual-parameter sensor of temperature and strain. Compared with the long period gratings coupled between core fundamental mode and cladding mode, this sensor has the advantages of refractive index insensitivity, spectrum stability, and high sensitivity.
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