In-line Fabry-Perot refractive index sensor based on microcavity

the etching and fusion splicing method is proposed. The experimental results demonstrate that the sensor possesses a high resolution of 1508 nm/RIU for the measurement of acetylene gas RI. The temperature-response measurement shows that the sensor is insensitive to room temperature variations. The FP RI sensor is suitable for applications in biosensing and environmental monitoring because of its high sensitivity and structural simplicity, thereby making it suitable for low-cost mass production. OCIS codes: 280.4788, 280.1415. doi: 10.3788/COL201311.082802. Fiber-optic refractive index (RI) sensors have attracted considerable interest in recent years because of their out-standing advantages over conventional sensors, including their high sensitivity, compact size, immunity to elec-tromagnetic interference, and remote sensing capability. These characteristics make fiber-optic RI sensors suit-able for applications such as biomedical research, health care, and environmental monitoring. Many differen