摘要
A sensing structure consisting of an abrupt taper spliced uniformly in to a fiber Bragg grating （FBG） is proposed and experimentally demonstrates refractive index （RI） and temperature measurements. Cladding modes are generated in the fiber through the abrupt taper containing the FBG. Most modes are reflected by the FBG at shorter wavelengths and reenter the launch fiber after passing through the abrupt taper. Spectral integrals are used to measure the power generated by the cladding and core modes. A sensitivity of-83.97 nW/RIU for ambient RI and a temperature sensitivity of 10 pm/℃ are obtained. No cross- sensitivity problems exist between ambient RI and temperature measurement.
A sensing structure consisting of an abrupt taper spliced uniformly in to a fiber Bragg grating （FBG） is proposed and experimentally demonstrates refractive index （RI） and temperature measurements. Cladding modes are generated in the fiber through the abrupt taper containing the FBG. Most modes are reflected by the FBG at shorter wavelengths and reenter the launch fiber after passing through the abrupt taper. Spectral integrals are used to measure the power generated by the cladding and core modes. A sensitivity of-83.97 nW/RIU for ambient RI and a temperature sensitivity of 10 pm/℃ are obtained. No cross- sensitivity problems exist between ambient RI and temperature measurement.
基金
supported by the National Natural Science Foundation of China(Nos.61377087 and 61077006)
Shaanxi Province Natural Science Foundation Research Project(No.S2010JC3655)
Northwest University Postgraduate Innovative Talents Training Project(No.YZZ12085)
