A highly sensitive fiber-optic refractive index sensor based on an edge-written long-period fiber grating

作者：Zhu, Tao^*; Rao, Yun Jiang; Wang, Jiu Ling; Song, Yun

来源：IEEE Photonics Technology Letters, 2007, 19(21-24): 1946-1948.

DOI：10.1109/LPT.2007.908777

• CO(2) lasers
• long-period fiber gratings (LPFGs)
• optical fiber sensors
• refractive index measurement

A novel long-period fiber grating (LPFG) is edge-written without any destructive damage on the fiber based on the thermal shock and rapid cooling effects of the high-frequency CO(2) laser pulses exposure method in this letter. The refractive index disturbance induced by high-frequency CO(2) laser pulses mainly occurs in the edge region of the fiber cladding rather than in the fiber core. An edge-written LPFG with a resonant peak of similar to 18 dB is obtained using a standard telecommunication fiber. The experimental results show that such a novel LPFG structure has much higher refractive index sensitivity over conventional LPFGs side-written, which can be used as a refractive index sensor, or a tunable filter and modulator by controlling the refractive index sensitive film which is coated on the cladding of such an LPFG.

• 出版日期2007-12
• 单位重庆大学; 电子科技大学