Abstract
Recent advances in devices and applications of high-birefringence fiber loopmirror sensors are addressed. In optical sensing, these devices may be used as strain andtemperature sensors, in a separate or in a simultaneous measurement. Other describedapplications include: refractive index measurement, optical filters for interrogate gratingsstructures and chemical etching control. The paper analyses and compares different types ofhigh-birefringence fiber loop mirror sensors using conventional and microstructured opticalfibers. Some configurations are presented for simultaneous measurement of physicalparameters when combined with others optical devices, for example with a long periodgrating.
Highlights
Fiber loop mirror (FLM) is a very attractive device for use in optical fiber communications or for use as an optical fiber sensor [1]
This paper reviewed recent advances in high-birefringence fiber loop mirror based sensors
This type of interferometric configuration is not itself a new concept; with the emergence of novel fibers, this structure has been the focus of intense R&D in last years
Summary
Fiber loop mirror (FLM) is a very attractive device for use in optical fiber communications or for use as an optical fiber sensor [1]. One of them is the input polarization independence Another one is the periodicity of the formed spectral filter, which depends only on the length of the Hi-Bi fiber and not on the total length of the fiber loop mirror [1]. The Hi-Bi fibers are polarization maintaining fibers where the linear polarization states are structurally maintained Due to this it is easier to implement an interferometer based on a fiber loop mirror. FLM with a D-type fiber is presented as solution for measurement of refractive index and with Hi-Bi PCF for temperature independent strain sensor. Some configurations are presented for simultaneous measurement of physical parameters when combined with others optical devices, for example with a long period grating
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