A highly sensitive refractive index (RI) sensor based on two cascaded microfiber knots with vernier effect is proposed
and demonstrated by theoretical arithmetic. Deriving from high proportional evanescent field of microfiber and sharp
spectrum fringes induced by vernier effect, a slight change of ambient RI will cause large variation of effective RI and
significant wavelength shift of resonant peaks, indicating high sensitivity and resolution of the proposed compound
resonator. Numerical analysis demonstrates a high sensitivity of 10000nm/RIU and a resolution of 5.57×10−5 RIU at the ambient RI around 1.33 for the fiber diameter of 1μm and cavity radii of R1 = 500μm, R2 = 547.62μm
A micro Fabry-Perot (MFP) filter is proposed and fabricated by twisting a section of microfiber into two Sagnac loop mirrors. With the co-operation of this MFP filter and a section of highly nonlinear fiber, we propose and experimentally demonstrate a multi-wavelength Erbium-doped fiber ring laser (EDFRL) based on the inhomogeneous loss mechanism. When the pump current is set at 450mA, 22-lasering wavelengths with the identical wavelength space of 0.22nm and side-mode suppression ratio (SMSR) above 30dB are achieved. Within the period of one hour’s monitoring, the fluctuation of the output power is less than 0.943dB.
A high sensitive temperature sensor based on Mach-Zehnder interferometer (MZI) is proposed and experimentally
demonstrated. Temperature measurement is achieved by immerging a section of microfiber into the refractive index (RI)
liquid with a high thermo-optic coefficient. A slight change of ambient temperature will lead to the enhanced variation
of the liquid index. Due to the evanescent field of microfiber, microfiber effective refractive index will be changed, and
subsequently the optical length. Thus, by measuring the free spectral range (FSR) of the MZI, the temperature sensor can
achieve a high sensitivity of 6.44nm/°C at the temperature of 20.6°C.
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