High-Temperature Properties of a Thin-Core Fiber MZI With an Induced Refractive Index Modification

A fiber-optic Mach-Zehnder interferometer is proposed and demonstrated experimentally. The device consists of a short piece of thin-core fiber (TCF) sandwiched between two standard single mode fibers. A microscope direct-writing technique with femtosecond laser exposure is utilized to induce a refra...

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Bibliographic Details
Published in:IEEE photonics technology letters 2016-10, Vol.28 (20), p.2245-2248
Main Authors: Bao, Weijia, Hu, Naifei, Qiao, Xueguang, Rong, Qiangzhou, Wang, Ruohui, Yang, Hangzhou, Yang, Tingting, Sun, An
Format: Article
Language:English
Subjects:
Annealing
Couplings
Femtosecond laser
Interference
Optical fiber devices
Temperature
Temperature measurement
Temperature sensors
ultra-high temperature measurement
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Summary:A fiber-optic Mach-Zehnder interferometer is proposed and demonstrated experimentally. The device consists of a short piece of thin-core fiber (TCF) sandwiched between two standard single mode fibers. A microscope direct-writing technique with femtosecond laser exposure is utilized to induce a refractive index change near the interface between the core and cladding of the TCF. This added refractive index profile is helpful for the coupling of the core-to-cladding modes, resulting in a well-defined interference spectrum. The ultra-high temperature property of the proposed interferometer is demonstrated up to 900 °C with a sensitivity of 94.3 pm/°C over repeated measurements. And the repeated operations of thermal annealing are employed to improve the thermal stability and measurement performance of the interferometer.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2016.2591262