中文摘要：

三分量加速度地震检波器检测加速度的核心部件是由2个3-dB耦合器级联而成的双M-Z干涉仪,3-dB耦合器的设计对三分量加速度地震检波器的检测精度尤为重要。介绍了三分量加速度地震检波器的结构和工作原理,导模之间的同向耦合理论。设置了3-dB耦合器波导的结构和计算参数。采用MATLAB对3-dB耦合器的输出功率进行仿真,仿真结果显示,3-dB耦合器在两输出端实现了能量的平均分配。用波导光学模拟软件OptiBPM v9.0对3-dB耦合器进行模拟仿真,光功率传输图表明,所设计的3-dB耦合器实现了光功率的均分。

英文摘要：

The core component of three-component acceleration seismic geophone is the dual M-Z interferometer which is composed of two cascaded 3-dB coupler.The design of 3-dB coupler is particularly important to the detection accuracy of three-component acceleration seismic geophone.The structure and working principle of the three-component acceleration seismic geophone and the theory of co-directional coupling between guided modes are introduced.The structure and calculation parameters of 3-dB coupler waveguide are set.Matlab is used for the simulation of output power of 3-dB coupler.Simulation result shows that it achieves equal energy distribution in the two outputs of 3-dB coupler.Waveguide optics simulation software OptiBPM v9.0 is used to simulate 3-dB coupler.The optical power transmission diagram demonstrates that the 3-dB coupler designed realizes the equalization of optical power.