Sensitivity enhancement of in-line chemical sensing device with C-type fiber and photonic crystal fiber

Abstract

The in-line chemical sensing device with novel C-type fiber and photonic crystal fiber was successfully fabricated. We further improved the sensitivity or light coupling efficiency of our in-line chemical sensing device with optimized the Ctype fiber length. The results show that sensitivity and response time of device are significantly enhanced with optimization of cleaving and splicing process. The gas sensing experiments with the optimized conditions are demonstrated for detecting partial pressure of acetylene. We also numerically analyzed the sensitivity of ring-core defect photonic crystal fiber which was used in this experiment, through full-vectorial finite element method.

Suspended Ring-Core Photonic Crystal Fiber Gas Sensor With High Sensitivity and Fast Response

“…In our previous study [14]- [16], we demonstrated an in-line gas sensor unit by proposing a novel 'C-type' fiber as a fiberized inlet/outlet and a PCF with Ge-doped ring defect as a sensing medium. This configuration could overcome prior limitations in PCF-based optical sensors such as broken symmetry in the periodic structure of the PCF, alignment and coupling difficulties and holes that are too small for efficient fluid entry [17]- [19].…”