Parameter optimization of the"sandwich"fiber based on no-core fiber in refractive index sensing applications
In order to improve the sensitivity of no-core fiber in refractive index and to address the problem that the optimization of structural parameters of no-core fibers was not sufficient,the optimization method for the structure parameters of no-core fiber was proposed,and the performance of the sensitivity of single mode-no-core-single mode(SNCS)fibers in refractive index(RI)sensing was investigated in this paper.The fibers were simulated using Rsoft optical simulation software through the beam propagation method,by which the optical field distribution and output transmission spectra were simulated.To enhance sensing sensitivity,the geometrical parameters of no-core fiber,including length and diameter,were systematically optimized by calculating the self-imaging period and wavelength shift under the condition that the transmission spectra did not overlap.It was demonstrated that SNCS fiber could reach a sensitivity of 2 200.92 nm/RIU in the refractive index range of 1.380-1.390 with the length of the no-core fiber 6.55 mm and the diameter 20 μm.It also verified the effectiveness of the proposed parameter optimization method for the no-core fiber structure.Through structural optimization,theoretical support was provided for designing structure and application of sandwich fiber based on no-core fiber in highly sensitive refractive index sensing.
NETL
NSTL
万方数据
