In-line optical fiber-sensors based on low-loss semi-reflective in-fiber mirrors

E. Cibula; D. Donlagic

doi:10.1117/12.922202

9 May 2012 In-line optical fiber-sensors based on low-loss semi-reflective in-fiber mirrors

E. Cibula, D. Donlagic

Proceedings Volume 8439, Optical Sensing and Detection II; 843922 (2012) https://doi.org/10.1117/12.922202
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

This paper presents the design and fabrication of semi-reflective in-fiber mirrors and their usage for the realization of different miniature fiber sensors. The fabrication of a semi-reflective in-fiber mirror is based on the selective chemical etching and splicing of standard single-mode fibers (SMF). The mirror's reflectance can be set precisely in between any range between 0.1% and 9.5 %. The practical usability of the produced in-fiber mirrors was evaluated by the fabrication of an in-line temperature sensor and evanescent field refractive index (RI) sensor. A temperature sensor is an intrinsic type of in-line FPI, formed between an in-fiber mirror and a flat-cleaved optical fiber tip. As an example, a temperature sensor that was optimized within a range from 0 to 100°C showed a temperature resolution better than 0.1 °C, and a repeatability better than 0.2 °C. The evanescent RI sensor was created by the splicing of a small-diameter SMF between two in-fiber mirrors and removing of the intermediate fiber-cladding by chemical etching. The effective index of the fundamental mode depended on the surrounding-medium RI, which was interrogated by a spectrally-resolved technique. A high sensitivity of 830 nm/RIU was measured at RI of 1.444.

Citation Download Citation

E. Cibula and D. Donlagic "In-line optical fiber-sensors based on low-loss semi-reflective in-fiber mirrors", Proc. SPIE 8439, Optical Sensing and Detection II, 843922 (9 May 2012); https://doi.org/10.1117/12.922202

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