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

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 S...

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Bibliographic Details
Published in:Optics letters 2014-11, Vol.39 (22), p.6521-6524
Main Authors: 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
Format: Article
Language:English
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.006521