High-Efficiency Coupling Method of the Gradient-Index Fiber Probe and Hollow-Core Photonic Crystal Fiber

Applied Sciences

卷:9

Chi Wang¹  Jianmei Sun¹  Yue Zhang¹  Anand Asundi²  Jinhui Li³  Xinqun Luan³ 

[1] Department of Precision Mechanical Engineering, Shanghai University, Shanghai 200444, China;

[2] School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore;

[3] Science and Technology on Near-surface Detection Laboratory, Wuxi 214035, China;

关键词: hollow-core photonic crystal fiber;    GRIN fiber probe;    coupling efficiency;    gas sensing;   

DOI  :  10.3390/app9102073

来源: DOAJ

【 摘 要 】

A high-efficiency coupling method using the gradient-index (GRIN) fiber probe and hollow-core photonic crystal fiber (HC-PCF) is proposed to improve the response time and the sensitivity of gas sensors. A coupling efficiency model of the GRIN fiber probe coupled with HC-PCF is analyzed. An optimization method is proposed to guide the design of the probe and five samples of the GRIN fiber probe with different performances are designed, fabricated, and measured. Next, a coupling efficiency experimental system is established. The coupling efficiencies of the probes and single-mode fiber (SMF) are measured and compared. The experimental results corrected by image processing show that the GRIN fiber probe can achieve a coupling efficiency of 80.22% at distances up to 180 μm, which is obviously superior to the value of 33.45% of SMF at the same distance. Moreover, with the increase of the coupling distance, the coupling efficiency of the probe is still higher than that of SMF.

【 授权许可】

Unknown