Abstract
The authors overview recent progress of fiber loop mirror based sensors in China Jiliang University. With the unique characteristics of fiber loop mirror made by various inserted fibers, fiber loop mirror based sensors have the potential to be exploited in a variety of wide applications.
Highlights
Fiber loop mirror (FLM), called Sagnac interferometer, is interesting and very useful component used in optical devices and systems [1,2,3,4,5,6]
When an FLM is inserted with a highly birefringent (HiBi) fiber, such as a polarization-maintaining fiber (PMF), a HiBi-FLM is made
One serious problem of sensors based on a HiBi-FLM used in measurements of curvature, strain or other parameters is their cross-sensitivity to temperature, which may degrade sensors’ performance since the optical path length of the HiBi-FLM shows temperature dependence caused by thermal refractive-index change and thermal expansion effect
Summary
Fiber loop mirror (FLM), called Sagnac interferometer, is interesting and very useful component used in optical devices and systems [1,2,3,4,5,6]. In FLM, two interfering waves counter-propagate through the same fiber and are exposed to the same environment. This makes it less sensitive to noise from the environment. Various kinds of FLM-based sensors have been demonstrated [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. A brief overview of the recent progress of FLM-based sensors in China Jiliang University is presented
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