Long Period Gratings in Random Hole Optical Fibers for Refractive Index Sensing

Sensors

Ke Wang¹ 

关键词: long period grating;    random hole optical fiber;    point-by-point;    refractive index sensing;   

DOI  :  10.3390/s110201558

来源: mdpi

【 摘 要 】

We have demonstrated the fabrication of long period gratings in random hole optical fibers. The long period gratings are fabricated by a point-by-point technique using a CO₂ laser. The gratings with a periodicity of 450 μm are fabricated and a maximum coupling efficiency of −9.81 dB has been achieved. Sensing of different refractive indices in the surrounding mediums is demonstrated by applying standard liquids with refractive indices from 1.400 to 1.440 to the long period grating.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.