A Miniature Fiber Collimator for Highly Sensitive Bend Measurements

作者：Xu, Xizhen; He, Jun^*; Hou, Maoxiang; Liu, Shuhui; Bai, Zhiyong; Wang, Ying; Liao, Changrui; Ouyan, Zhengbiao; Wang, Yiping

来源：Journal of Lightwave Technology, 2018, 36(14): 2827-2833.

DOI：10.1109/JLT.2018.2823748

• Fabry-Perot interferometers
• optical fiber sensors
• optical fiber devices

A Fabry-Perot interferometer (FPI) composed of a miniature fiber collimator is proposed and demonstrated for high-sensitivity bend measurements. The device consists of a quarter-pitch graded index fiber (GIF) spliced with a section of silica tube, which is interposed between single-mode fibers. The divergence angle of the included miniature fiber collimator was 0.058 rad, which was found to enhance the sensitivity of the proposed FPI to -3.353 dB/degree over the applied angle range. In comparison, the divergence angle without the collimator was 0.130 rad and FPI sensitivity was -0.618 dB/degree over the applied angle range. The fiber bend sensors demonstrated in this paper are compact, robust, and highly sensitive, and hence, are promising in various biomedical applications.

• 出版日期2018-7-15
• 单位深圳大学