Analysis of Optical Kerr Effect Error and Elimination Method of Brillouin Fiber Optical Gyroscope

作者：Li, Xuyou; He, Zhou^*; Wei, Yitao; Hao, Jinghui

来源：Sensor Letters, 2012, 10(7): 1463-1467.

DOI：10.1166/sl.2012.2460

• Fiber Optical Gyroscope
• Optical Kerr Effect
• Brillouin Scattering
• Intensity Modulation

Optical Kerr effect is the major error factor in Brillouin fiber optical gyroscope. The mathematical model considering the polarization factor and optical power difference was established. The error caused by optical Kerr effect was quantitatively calculated, and it obtained that the error caused by optical power difference of 1 mW is about 2 x 10(-3) rad/s, for the inertial grade accuracy gyro the optical power difference requires to be controlled less than 10 nW. The gyro error caused from the splitting ratio error of coupler was analyzed, the optical Kerr effect error from Brillion gain coefficient difference which caused by temperature changes was derived, then the optical Kerr effect error model of pump light detuned caused by gyro rotation was established and quantitatively calculated. The 50% duty cycle square wave intensity modulation with modulation frequency equal to multiples free spectral range to eliminate optical Kerr effect error was proposed and designed, and the experimental test result shows that it can greatly reduce the optical Kerr effect error caused by the optical power difference.

• 出版日期2012-7
• 单位哈尔滨工程大学