Regular Paper

[OPTICAL REVIEW Vol. 21, No. 5 (2014) 676-678]
© 2014 The Japan Society of Applied Physics

Refractive Index Sensor Based on Stress-Induced Long Period Grating

Guei-Ru LIN1*, Hung-Ying CHANG1, Ming-Yue FU2, Hao-Jan SHENG3, and Wen-Fung LIU3

1Ph.D. Program in Electrical and Communications Engineering, Feng Chia University, Taichung 40724, Taiwan, R.O.C.
2Department of Avionics Engineering, Air Force Academy, Kaohsiung 82047, Taiwan, R.O.C.
3Department of Electrical Engineering, Feng Chia University, Taichung 40724, Taiwan, R.O.C.

(Received March 17, 2014; Revised May 30, 2014; Accepted June 2, 2014)

We proposed a novel refractive index sensor based on a side-polishing fiber to be cascaded with a stress-induced long period fiber grating (LPG), which is created by applying a force to a V-grooved plate on the single mode fiber with micro-bending deformation. When the refractive index (RI) surrounding the side-polishing surface is changed, the LPG-induced cladding mode light could be coupled back to the core mode, so that it will result in the magnitude variation of LPG loss-peak. This property of index sensing based on the stress-induced LPG by monitoring the power-level change may be exploited in chemical sensing and environmental monitoring applications.

Key words: fiber sensor, long period grating, stress, refractive index sensor

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