[5] A. Kung, J. Budin, L. Thevenaz et al.. Rayleigh fiber optic gyroscope[J]. IEEE Photon. Technol. Lett., 1997, 9(7): 973～975

[6] Libo Yuan, Zhihai Liu, Jun Yang. Rayleigh backscattering fiber optic rotation sensor based on combined two-ring-resonator[J]. Sensors and Actuators A, 2007, (136): 216～220

[7] A. Kung, J. Budin, L. Thevenaz et al.. Optical fiber ringresonator characterization by optical time-domain reflectometry[J]. Opt. Lett., 1997, 22(2): 90～92