为提高Y波导调制器调制性能从而提高光纤陀螺的整体性能,分析了用于光纤陀螺的Y波导相位调制器残余强度调制产生的机理,即存在波导缺陷以及基底杂散光反射;阐述了残余强度调制对光纤陀螺系统特性的影响,残余强度调制主要影响光纤陀螺的标度因素;测试了不同Y波导残余强度调制的波形特性和它的线性分量及干涉分量大小,不同Y波导残余强度调制大小差异较大,性能好的Y波导残余强度调制大小可以控制在1‰以内;测试了温度对残余强度调制波形特性的影响,残余强度调制受温度影响较大,极端温差下残余强度调制大小波动可达20%;根据残余强度调制的产生机理和线性干涉分量比的大小,提出改进Y波导制作工艺的措施,以期提高Y波导的调制性能.%In order to improve modulation performance of Y waveguide modulator so as to im-prove the overall performance of fiber optical gyroscope (FOG ) ,mechanism for residual intensity modulation (RIM ) of Y-waveguide phase modulator used in FOG are analyzed , namely waveguide defects and substrate stray light reflection .Then the influence of RIM on characteris-tics of FOG system ,and calibration factor of RIM influence mainly on FOG are described . Waveform characteristic of RIM of different Y-waveguide phase modulators and its value of line-ar components and interference are tested .Difference of RIM of different Y waveguide modula-tors is large .The value of RIM with good performance Y-waveguide modulator can be controlled within 1‰ .Influences of temperature on waveform characteristic of RIM are tested .Fluctua-tions of RIM value can reach 20% under extreme temperature .Finally according to RIM mecha-nism and ratio of linear interference components ,the measures for improving Y waveguide tech-nology are put forward .
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