[OPTICAL REVIEW Vol. 21, No. 5 (2014) 676-678]
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.
(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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