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基于开槽型DBR光纤激光器拍频的折射率探测

Refractive Index Detection Based on Beat-frequency of Cladding-carved DBR Fiber Lasers

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摘要

提出一种包层开槽型分布布拉格反射光纤激光器, 用于光纤激光折射率探测.该激光器以单纵模双偏振分布布拉格反射光纤激光器为核心传感单元, 以结构双折射产生的拍频信号为传感信号对折射率进行探测.实验中应用频率编码, 灵敏度高且易于解调.利用二氧化碳激光器的热效应对分布布拉格反射光纤激光器的谐振腔加工开槽, 通过控制其扫描范围和功率来制备不同宽度和深度的开槽结构, 并研究了不同结构参量对灵敏度特性的影响.实验测得最优灵敏度达-240 MHz/RI-unit .此外, 还对该结构的温度传感特性做了测试, 相较于未刻槽结构, 温度灵敏度提高了21%, 达1.73 MHz/℃.该装置结构紧凑、稳定性高、制备简单且成本低廉, 可用于进一步研究分布布拉格反射光纤激光器的传感和复用特性.

Abstract

A kind of cladding-carved Distributed Bragg Reflection (DBR) fiber laser was proposed for fiber laser refractive index detection. The core sensing unit is a single longitudinal mode dual polarization DBR fiber laser, the beat signal generated by the structure birefringence is used as the sensor signal to detect the refractive index. Frequency coding using in the experiment has the advantages of high sensitivity and is easy to demodulate. Using the thermal effect of the CO2 laser can carve the cavity of DBR fiber laser. The effects of different structural parameters on the sensitivity characteristics were studied by controlling the scanning range and the power of the CO2 laser. The effects of different structural parameters on the sensitivity characteristics were studied. The measured optimum sensitivity is -240 MHz / RI-unit. In addition, the temperature sensing characteristics of the structure were tested, and the sensitivity was increased by 21% to 1.73 MHz/℃, compared to the non-carved structure. The device has the advantages of compact structure, high stability, simple preparation and low cost, and can be used to further study of the sensing and multiplex characteristics of DBR fiber lasers.

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中图分类号:TN253

DOI:10.3788/gzxb20174607.0706006

基金项目:国家自然科学基金(No.61575083)和广东省自然科学基金(No. 2014A0303133)资助

收稿日期:2017-01-12

修改稿日期:2017-03-23

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李蒙蒙:暨南大学 光子技术研究院, 广州 510632
刘博:暨南大学 光子技术研究院, 广州 510632
梁贻智:暨南大学 光子技术研究院, 广州 510632
梁浩:暨南大学 光子技术研究院, 广州 510632
李杰:暨南大学 光子技术研究院, 广州 510632
关柏鸥:暨南大学 光子技术研究院, 广州 510632

联系人作者:李蒙蒙(1046028092@qq.com)

备注:李蒙蒙(1990-), 女, 硕士研究生, 主要研究方向为光纤光栅传感技术.

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引用该论文

LI Meng-meng,LIU Bo,LIANG Yi-zhi,LIANG Hao,LI Jie,GUAN Bai-ou. Refractive Index Detection Based on Beat-frequency of Cladding-carved DBR Fiber Lasers[J]. ACTA PHOTONICA SINICA, 2017, 46(7): 0706006

李蒙蒙,刘博,梁贻智,梁浩,李杰,关柏鸥. 基于开槽型DBR光纤激光器拍频的折射率探测[J]. 光子学报, 2017, 46(7): 0706006

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