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Considering that the signal analysis is usually based on dual-way intensity detection,a novel method is demonstrated that uses Stokes vector method to analyze the degree of polarization degree in the optical fiber current sensor.In approximate conditions,the reduction transmission matrix is deduced and obtained of the full optical fiber current sensor based on Mueller matrix.It is found that the effect of the Stokes vector method is similar to the Jones vector method;by comparing the Jones vector method with the actual experimental results,it is easy to know that the Stokes vector has more operational advantages,such as only real numbers included in the Mueller matrix,easily being changed to sparse matrix and the final polarization degree being obtained by calculating the second diagonal element of the total transmission matrix.This method can be used in the theoretical analysis of the degree of polarization,and simplify the analysis process and operation process effectively.

A high-drop air-hole-type photonic crystal ring resonator(PCRR)was proposed based on twodimensional square lattice configuration.The single mode operation can be realized by compressing the width of bus waveguide.The impact of number of rows of holes on the propagating field intensity distribution was also analyzed.The physical parameters,such as dropping wavelength,dropping efficiency and spectral quality factor(Q)affected by changing the localized refractive index of inner ring and coupling strength between bus waveguide and PCRR,were numerically demonstrated based on two-dimensional(2D)finite-difference time-domain(FDTD)technique.It shows that 99% dropping efficiency and 379 Q can be obtained at 1 528.1nm signal channel when the width of bus-waveguide and coupling strength are 0.7-periodicity and 0-periodicity,respectively.On the other hand,when the coupling strength increases to 1periodicity,the Qcan be improved by 1 397with the decreased dropping efficiency by 89%.Besides,the dropping wavelength can be linearly increased with the increase of localized refractive index of inner ring.