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A novel sensor is proposed and demonstrated for simultaneous measurement of refractive index (RI) and temperature by splicing a 9.5mm claddingless fiber to a 20.3mm polarization-maintaining fiber in a Sagnac loop. Only two extinct dips are observable from 1400nm to 1700nm in the transmission spectrum of the sensor. One dip induced by Sagnac interference of the Sagnac loop is located near 1520nm, while...
A novel Erbium-doped fiber ring cavity laser sensor for refractive index (RI) measurement based on a special designed few-mode-singlemode-few-mode structure is proposed and experimentally demonstrated. The few-mode fiber is a home-made concentric ring core fiber (CRCF) which can only support two scalar modes. Thus a stable mode interference occurs which functions as a sensing head and band-pass filter...
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