Highly efficient free-space fiber coupler with 45° tilted fiber grating to access remotely placed optical fiber sensors

• DOI: 10.1364/oe.392170
• Publication Date: 2020-05-04T08:00:23Z
• Authors: Sankhyabrata Band...; Li-yang Shao; Wang Chao; Zhijun Yan; Fei Hong; Guoqing Wang; Jiahao Jiang; Ping Shum; Xiaoping Hong; Weizhi Wang
• Keywords: Fiber Bragg Grating; Collimator; Waveguide

In this work, a 45° tilted fiber grating (TFG) is used as waveguide coupler for the development of portable interrogation system to access remotely placed optical sensors. The TFG directly connected remote sensor and serves highly efficient light between unit sensor. Variation strain temperatures are measured with standard Bragg (FBG) sensor, which A beam from coupled into by lenses, mirrors collimator acted input FBG. Reflected FBG back via same TFG. being receiver transmitter constituent key part connect "light source sensor" "optical detector." successful demonstration developed temperature sensing applications have been presented discussed. Signal noise ratio reflected sensors was greater than ∼ 40 dB.