| YANG Kang,LIU Yan-ge,WANG Zhi,LI Guo-yu,HAN Ya,ZHANG Hong-wei,MAO Bai-wei.Fiber laser twist sensor with hybrid few-mode tilted Bragg grating and few-mode long period grating[J].Optoelectronics Letters,2019,15(3):161-164 |
| Fiber laser twist sensor with hybrid few-mode tilted Bragg grating and few-mode long period grating |
| Author Name | Affiliation | | YANG Kang | Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, China
Institute of Information Technology, Handan University, Handan 056005, China | | LIU Yan-ge | Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, China | | WANG Zhi | Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, China | | LI Guo-yu | Institute of Information Technology, Handan University, Handan 056005, China | | HAN Ya | Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, China | | ZHANG Hong-wei | Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, China | | MAO Bai-wei | Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, China |
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| Abstract: |
| A twist sensor with hybrid few-mode tilted fiber Bragg grating (FM-TFBG) and few-mode long period grating (FM-LPG) in fiber laser cavity is demonstrated. The FM-LPG is utilized to excite LP11 core mode. The FM-TFBG is used for sensing. The transverse modes at 1 553.9 nm and 1 550.5 nm are LP01 and LP21 core modes, respectively, which are coupled from forward-propagating LP11 core mode. These two excitation wavelengths have opposite variation tendencies, which participate in sensing. The twist sensitivity of 0.16 dB/° from ?40° to 40° is achieved. The proposed sensor has potentially used for structure monitoring in many areas. |
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