新型电光扫描器中光波导阵列特性研究

Study on Characteristics of an Optical Waveguide Array in a Novel Type of Electro-optic Scanners

利用有限差分光束传输法(FD-BPM)详细研究了光波导阵列电光扫描器的核心部件—光波导阵列的传输特性和辐射特性,分析了光波导阵列结构参量对其传输特性和辐射特性的影响.研究结果表明,光波导芯层厚度、光波导阵列的周期、长度和层数对光波导阵列输出面上的光场振幅、相位分布及光波导阵列输出光束主瓣的半峰值全宽度(FWHM)影响很大.通过与其它理论研究的结果进行比较指出,FD-BPM可以很方便地、更全面地描述光波导阵列的传输和辐射特性.另外,在研究光波导阵列光束扫描的基础上,根据光波导阵列电光扫描器的扫描探测要求,提出了光波导阵列结构优化设计的原则.

Optical Waveguide Array （OWA） was the key parts of Optical Waveguide Array Electro-Optic Scanner （OWAEOS）. Propagation and output characteristics of OWA were studied in the finite-difference beam-propagation method （FD-BPM）. Effect of structure parameters of OWA on propagation and output characteristics was analyzed. These results showed that core layer thickness, period, length and number of optical waveguide of （-）WA were of great effect on amplitude and phase distribution on output section and on the full width at half-maximum （FWHM） of main lobe of output beam. By comparing these results with what were obtained in other methods, the FD-BPM was more convenient and comprehensive to describe propagation and output characteristics of OWA. In addition, scanning characteristics of OWA were studied. Then according to the demand of beam scanning, the optimal structure scheme of OWA is presented.