Sensing with slow light in an active fiber Bragg grating

Xinxin Li; Kai Qian; Xuqiang Wu Jr.; Shenglai Zhen Jr.; Shidong Li; Da Qiu; Xiaojie Dong; Benli Yu; Li Zhan

doi:10.1117/12.2300534

10 January 2018 Sensing with slow light in an active fiber Bragg grating

Xinxin Li, Kai Qian, Xuqiang Wu Jr., Shenglai Zhen Jr., Shidong Li, Da Qiu, Xiaojie Dong, Benli Yu, Li Zhan

Proceedings Volume 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications; 106180Z (2018) https://doi.org/10.1117/12.2300534
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

The phase-shifted sensitivity of an interferometer can be enhanced by increasing the group index. In this paper, we experimentally demonstrate a slow light sensor by placing an active fiber Bragg grating (FBG) in one arm of the Michelson’s interferometer. A 25 KHz AC voltage was applied to a piezoelectric (PZT) set nearby the active FBG. Once the wavelength is varied to near the FBG band edge, the maximum phase-shifted amplitude appears, which is about 1.8 rad and is 4 times greater than that when wavelength is near the center of the reflection band. The active FBG is pumped by a 980 nm laser diode, which can help us to stabilize the system works in the slow light regime to obtain the maximum phase shift. It provides a very simple approach to increase the phase-shifted sensitivity, which is likely to have important applications for strain and acoustic sensors.

Citation Download Citation

Xinxin Li, Kai Qian, Xuqiang Wu Jr., Shenglai Zhen Jr., Shidong Li, Da Qiu, Xiaojie Dong, Benli Yu, and Li Zhan "Sensing with slow light in an active fiber Bragg grating", Proc. SPIE 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications, 106180Z (10 January 2018); https://doi.org/10.1117/12.2300534

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