论文部分内容阅读
新一代计算机光互连普遍采用的垂直腔面发射激光器(VCSEL),是波长为850 nm的多模激光器。为了更好地与其匹配,需要开发截面大小与其输出面大小接近的脊形波导。在成功制备了最小截面积70μm×50μm,直线长度21 cm聚硅氧烷脊形波导的基础上,对其损耗机制进行了理论分析。利用微扰理论分析可知吸收损耗可以忽略不计,主要损耗由上下表面和侧面粗糙度引起的表面散射损耗决定。利用变分原理和有限元方法分析了气泡、缺陷和杂质对场分布的影响,得出了基模和1阶模受到肉眼可辨的影响和发生跃变时气泡、缺陷或杂质的具体量值。利用CCD摄像法测量传输损耗,实验结果与理论结果基本相符。
A new generation of vertical cavity surface-emitting lasers (VCSELs) commonly used in optical interconnection of computers is a multimode laser with a wavelength of 850 nm. In order to better match it, it is necessary to develop a ridge waveguide with a cross-sectional area close to the size of its output face. Based on the successful preparation of a polysiloxane ridge waveguide with a minimum cross-sectional area of 70μm × 50μm and a linear length of 21 cm, the mechanism of loss was theoretically analyzed. Perturbation theory analysis shows that the absorption loss is negligible, and the main loss is determined by the surface scattering loss caused by the roughness of the upper and lower surfaces and the side surfaces. The influence of bubbles, defects and impurities on the field distribution was analyzed by using the variational principle and the finite element method. The specific magnitudes of bubbles, defects or impurities in the fundamental mode and the first-order modes were found to be discernible to the naked eye and the transition occurred. . The transmission loss was measured by CCD camera method. The experimental results are in good agreement with the theoretical results.