Multi-wavelength FBG based on thermal diffusion and phase mask techniques

Multi-wavelength FBG based on thermal diffusion and phase mask techniques
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基于热扩散和相位掩模技术的多波长光纤光栅

DOI:
10.1016/j.optcom.2018.06.047
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发表时间:
2018-11
影响因子:
2.4
通讯作者:
Yuan Libo
Yuan Libo
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhao Yujia;Pan Ling;Ouyang Yang;Xu Xiaofeng;Zhou Liming;Zhou Ai;Yuan Libo

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提出了一种短多波长光纤布拉格光栅(MW-FBG)的制作方法。MW-FBG的制作方法包括:利用放电热扩散技术在光敏单模光纤(P-SMF)中制作扩芯,并利用紫外曝光技术在预处理后的P-SMF上写入FBG。电弧放电的作用是使P-SMF纤芯中的掺杂剂向包层扩散,降低了纤芯放电区的折射率。因此,通过一个相位掩模的单次曝光可以产生具有多个谐振波长的FBG。对双波长光纤光栅的应变和温度响应进行了实验研究。结果表明,光纤光栅的多个波长对应变或温度的响应几乎相同。两个波长的FBG的应变灵敏度分别为0.9025 pm/μ ε和0.9101 pm/μ ε,温度灵敏度分别为10.55 pm/° C和10.33 pm/° C。这种MW-FBG在小尺寸和高空间分辨率测量的情况下具有潜在的应用。
A short multi-wavelength fiber Bragg grating (MW-FBG) fabrication method is proposed and demonstrated. The MW-FBG fabrication method includes making expanded core in the photosensitive single mode fiber (P-SMF) by the discharge-based thermal diffusion technique and writing FBGs on the pre-processed P-SMF through ultraviolet exposure technique. The effect of the arc discharge is to make the dopant in the core of the P-SMF diffuse to the cladding, which can reduce the refractive index of the core at the discharged region. As a result, a single exposure through one phase mask can produce a FBG with multiple resonant wavelengths. The strain and temperature responses of a two-wavelength FBG are experimentally investigated. Results show that the multiple wavelengths of the FBG have almost the same responses to the strain or temperature. The strain sensitivities of the two wavelengths of the FBG are 0.9025 pm/μ ε and 0.9101 pm/μ ε, respectively, and the temperature sensitivities are 10.55 pm/° C and 10.33 pm/° C, respectively. Such MW-FBGs have potential applications in the case of small size and high spatial resolution measurement.
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