Design of Double Y Branch Waveguide in Acceleration Seismic Geophone
Design of Double Y Branch Waveguide in Acceleration Seismic Geophone
复制标题
DOI：
10.4304/jcp.8.1.217-224
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
D. En;Jieyu Feng;N. Zhang;Ningning Wang;Xiaobin Wang
中科院分区：
文献类型：
--
作者：
D. En;Jieyu Feng;N. Zhang;Ningning Wang;Xiaobin Wang
双M-Z干涉仪是三分量加速度地震检波器的敏感元件，而Y分支波导是由双M-Z干涉仪组成的基本光学元件，因此Y分支波导的设计直接影响三分量加速度地震检波器的性能。首先介绍了分支波导和S形弯曲波导，并在此基础上设计了对称的双Y分支S形弯曲波导。其次，对分支光波导的弯曲损耗进行了分析计算。利用MatLab软件对1/2Y和1/4Y分支光波导的传输特性以及弯曲损耗随1/2Y和1/4Y分支光波导长度的变化进行了数值模拟。结果表明，在L 320μm后，1/2 Y分支光波导的最大弯曲损耗为0.156分贝，并接近于0；在L>；200μm后，1/4 Y分支光波导的最大弯曲损耗为0.058分贝，弯曲损耗接近于0，双Y分支的设计满足低损耗的要求。第三，对3dB耦合器中分支光波导光功率转换进行了仿真和分析。最后对质子交换技术和钛扩散技术进行了比较，总结了质子交换技术的优点，介绍了质子交换的原理，总结了良好的质子交换退火条件。
Dual M-Z interferometer is the sensitive element of three-component acceleration seismic geophone, while Y branch waveguide is the basic optical components composed of dual M-Z interferometer, so the design of Y branch waveguide directly affects the performance of three-component acceleration seismic geophone. Firstly, branch waveguide and S-shaped bent waveguide are introduced, and symmetrical double Y branch S-shaped bent waveguide is designed based on this. Secondly, the bending loss of the branch waveguide is analyzed and calculated. The transmission of 1/2Y branch waveguide and 1/4Y branch waveguide , and the bending loss changes with the length of 1/2Y branch waveguide and 1/4Y branch waveguide is simulated by MATLAB. The result shows that the maximum bending loss of 1/2 Y branch waveguide is the 0.156dB, and the bending loss is close to 0 after L >320μm; the maximum bending loss of 1/4 Y branch waveguide is 0.058dB, and the bending loss is close to 0 after L >200μm. The design of double Y branch meets the requirement of low loss. Thirdly, the optical power conversion of branch waveguide in 3dB coupler is simulated and analyzed. Finally, proton exchange and Ti diffusion technique are compared; the advantages of proton exchange technology are summarized; the principle of proton exchange is introduced; and a good proton exchange annealing condition is summarized.