Spectrum Characteristics Analysis of the Tilted Fiber Bragg Grating

Simultaneous measurement of temperature and refractive index based on a core-offset Mach-Zehnder interferometer cascaded with a long-period fiber grating

“…The simultaneous measurement of the temperature and external RI is demonstrated based on the sensitive matrix. Its low fabrication cost, simple configuration and high sensitivity make this sensor have potential applications in chemical and biological sensing.Fiber sensors are widely used in sensing measurement fields, such as temperature, strain, micro-displacement and refractive index, because of their unique advantages of small size, light weight, immunity to electromagnetic interference, resistance to high pressure and high temperature, corrosion-resistance and so on [1][2][3] .Optical fiber sensors based on interference principle have the advantages of high sensitivity and flexible structure. In recent years, various on-line optical fiber interferometric sensors have been reported, such as single mode-multimode-single mode (SMS) structure [4] , single-mode fiber cascaded with thin-core fiber [5] , tapered fiber or peanut-shape Mach-Zehnder interferometer (MZI) [6] , laser drilling and core-offset splicing [7] .…”

“…Fiber sensors are widely used in sensing measurement fields, such as temperature, strain, micro-displacement and refractive index, because of their unique advantages of small size, light weight, immunity to electromagnetic interference, resistance to high pressure and high temperature, corrosion-resistance and so on [1][2][3] .…”