Electro-optical circuit boards should provide simple and cost-effective coupling techniques and crosstalk levels of less than -30 dB. A dicing saw was used to create waveguide grooves with a surface roughness of less than 183 nm in a 1.6-mm-thick polymethyl methacrylate polymer (PMMA) substrate. The buried optical waveguides were made from SU-8 in a PMMA substrate covered with a 1-mm PMMA sheet. The propagation loss for a 500 mu m x 570 mu m straight waveguide was 0.9 dB/cm at 1310 nm. The coupling between parallel waveguides was measured at separation distances from 45 to 595 mu m. The crosstalk was less than -40 dB for 65-mm-long waveguides. This fabrication method shows potential for dense optical interconnects with very low crosstalk. (C) 2016 Optical Society of America
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机译：电光电路板应提供简单且具有成本效益的耦合技术，串扰水平应小于-30 dB。使用划片机在1.6毫米厚的聚甲基丙烯酸甲酯聚合物（PMMA）基板上创建表面粗糙度小于183 nm的波导凹槽。埋入式光波导由SU-8制成，覆盖在覆盖1毫米PMMA片的PMMA基板中。 500 µm x 570 µm直线波导在1310 nm处的传播损耗为0.9 dB / cm。平行波导之间的耦合是在45至595μm的分离距离下测量的。对于65毫米长的波导，串扰小于-40 dB。这种制造方法显示出具有非常低串扰的密集光互连的潜力。 （C）2016美国眼镜学会
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