Chinese Optics Letters, 2021, 19 (3): 030602, Published Online: Mar. 16, 2021  

Tunable phase-shifted fiber Bragg grating based on a microchannel fabricated by a femtosecond laser Download: 649次

Author Affiliations
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Abstract
A phase-shifted fiber Bragg grating (PS-FBG) based on a microchannel was proposed and realized by combining the point-by-point scanning method with chemical etching. The PS-FBG is composed of a fiber Bragg grating (FBG) and a microchannel through the fiber core. The microchannel can introduce phase shift into the FBG. What is more important is that it exposes the fiber core to the external environment. The phase shift peak is sensitive to the liquid refractive index, and it shows a linear refractive index response wavelength and intensity sensitivity of 2.526 nm/RIU and -111 dB/RIU, respectively. Therefore, such gratings can be used as sensors or tunable filters.

Li Zeng, Xiaoyan Sun, Zikun Chang, Youwang Hu, Ji’an Duan. Tunable phase-shifted fiber Bragg grating based on a microchannel fabricated by a femtosecond laser[J]. Chinese Optics Letters, 2021, 19(3): 030602.

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