多模干涉结构内单模光纤上的紫外线照射。

UV exposure on a single-mode fiber within a multimode interference structure.

作者信息

Wu Qiang, Yuan Jinhui, Yu Chongxiu, Sang Xinzhu, Sun Lipeng, Li Jie, Guo Tuan, Guan Baiou, Chan Hauping, Chiang Kin Seng, Ma Youqiao, Wang Pengfei, Semenova Yuliya, Farrell Gerald

出版信息

Opt Lett. 2014 Nov 15;39(22):6521-4. doi: 10.1364/OL.39.006521.

DOI:10.1364/OL.39.006521

PMID:25490509

Abstract

We experimentally study the effects of UV exposure on a single-mode fiber (SMF) with a fiber multimode interferometer (MMI) based on the singlemode-multimode-singlemode-multimode-singlemode (SMSMS) fiber structure. We observe a wavelength shift of over 33 nm when irradiating the central SMF in the SMSMS fiber structure with a 3-mm-width UV beam (the UV laser has a wavelength of 193 nm and pulse energy of 3 mJ). According to our numerical simulation, the SMSMS fiber structure can achieve a very high refractive-index (RI) sensitivity of 67670 nm/RIU with a very good linearity of R2≈0.9999. The structure can find potential application for high-sensitivity RI sensing by replacing the central SMF with a hollow-core optical fiber filled with the sample under test. The UV exposure technique can be used for tuning the characteristics of fiber MMI devices.

摘要

我们通过实验研究了紫外线照射对基于单模-多模-单模-多模-单模（SMSMS）光纤结构的光纤多模干涉仪（MMI）的单模光纤（SMF）的影响。当用宽度为3毫米的紫外线束（紫外线激光器波长为193纳米，脉冲能量为3毫焦）照射SMSMS光纤结构中的中心单模光纤时，我们观察到波长偏移超过33纳米。根据我们的数值模拟，SMSMS光纤结构可实现67670纳米/RIU的非常高的折射率（RI）灵敏度，且具有非常好的线性度，R2≈0.9999。通过用填充有待测试样品的空心光纤替换中心单模光纤，该结构可在高灵敏度RI传感方面找到潜在应用。紫外线照射技术可用于调整光纤MMI器件的特性。