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A selective-filling high birefringent photonic crystal fiber (SF-HBPCF) based Sagnac interferometer (SI) was demonstrated. The SF-HBPCF was achieved by infiltrating a high index liquid into two symmetrical air holes of the innermost layer of an index-guiding un-birefringent PCF. The birefringence characteristics of the SF-HBPCF and the strain sensing characteristics of the SF-HBPCF based SI were theoretically...
A compact fiber interferometric probe with high contrast based on a long period grating inscribed in an all-solid photonic bandgap fiber is proposed and demonstrated. The LPG functions as a beam splitter and combiner for the fundamental core mode and LP01 cladding supermodes, and the fiber probe works from the interference between the two guided modes. The sensitivities of the interferometer to strain...
One hole of a polarization maintain photonic crystal fiber has been selectively infiltrated with liquid crystal. The temperature responding is study and a special property is found near clear temperature of the liquid crystal.
A high sensitivity temperature sensor based on a Sagnac interferometer consisting of a segment of selectively liquid-filled photonic crystal fiber (SLF-PCF) is proposed and demonstrated. The SLF-PCF is achieved by the high frequency CO2 laser and possesses unique birefringence feature. Numerical and experimental results are presented, and a high sensitivity temperature sensor with sensitivity of ∼−11...
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