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《固体电子学研究与进展》2015,(1)
在绝缘体上硅(Silicon-on-insulator,SOI)材料的基础上,建立了SiGe-SOI微纳米尺寸的光波导结构模型,选取了损耗较小的S型SiGe-SOI弯曲光波导进行设计,并对其直波导和弯曲波导的模场进行了分析。设计中采用保角变换和三维全矢量BPM算法相结合的方法,对SiGe-SOI弯曲光波导进行了弯曲损耗分析,得到了弯曲半径对弯曲损耗的影响,给出了影响微纳米SiGe-SOI弯曲光波导设计的敏感参数。最后根据理论分析的结果,绘制了不同宽度的光波导版图,制作了微纳米SiGe-SOI弯曲光波导,并对其进行了测试分析,最终实验结果与理论分析一致,从而验证了该设计方法和理论分析的正确性。 相似文献
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波导弯曲部分是出现波导辐射损耗最大的地方,所以在设计弯曲波导时,有必要对波导的这部分进行优化设计处理。该文利用电磁场理论,完成对余弦形分支光波导弯曲部分损耗的数学建模.最后针对铌酸锂基片上,用退火质子交换法生成的分支光波导进行数值仿真。 相似文献
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光波导的弯曲损耗一直是集成光学中一个值得人们重视的问题,为有效地减小光波导弯曲损耗,弯曲光波导的设计成为集成光学波导设计中的一个重要内容.本文在弯曲光波导保形变换方法的基础上,应用几何光学分析方法给出了波导弯曲损耗产生的简洁的物理图像,从而深入地分析了弯曲损耗产生的根本原因,并由此提出了弯曲光波导端面修饰的设计方法.理论分析表明,与传统的弯曲的光波导设计相比,该种设计方法可以有效地减小导波的模式泄漏,从而减小波导弯曲损耗.尤其是在弯曲光波导曲率半径、材料折射率等参数被设定的情况下,该种设计方法成为一种有效的设计方法. 相似文献
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用B样条函数对S形弯曲波导进行结构优化 总被引:2,自引:0,他引:2
S形弯曲波导是集成光器件中不可缺少的部分。在光开关阵列、星形耦合器以及阵列波导光栅等器件中。以及将多个元件集成到一个芯片上时,都需要很多的S形弯曲波导来实现波导的侧向位移和连接。其尺寸和损耗直接影响整个器件的损耗以及集成密度。弯曲波导插入损耗(不包括由于结构缺陷而产生的光的散射损耗)由两部分组成:纯弯曲损耗和过渡损耗。从弯曲损耗产生的机理人手,提出用B样条泛函逼近理论实现任意边界条件下S形的优化方法,得到纯弯曲损耗尽可能小,并消除与直波导相连处过渡损耗的S形波导。且与正弦、余弦和双圆弧曲线得到的S形进行对比,用光束传播法验证。结果表明优化曲线插入损耗明显小于双圆弧和余弦曲线。 相似文献
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光波导弯曲的结构优化 总被引:8,自引:1,他引:8
本文在简要给出光波导弯曲损耗产生机理的基础上,综合波导弯曲的纯弯曲损耗和过渡损大学生怕特点,就波导弯曲对弯曲结构函数及其曲率的要求,提出波导弯曲的三次样条优化方案,给出了广泛条件下的波导弯曲优化条件的新方法。该方法可广泛用于各种波导弯曲结构的优化设计,优化过程简单且可达高精度,文中给出了此新方案的比较和设计例子。 相似文献
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本文提出的溶液浓度在线测量,是利用大直径的玻璃光波导和半导体光电器件。文章对不同形状的光波导进行了计算,并结合实验取得测量浓度最佳形状的光波导。对光源及探测电路也进行了探讨;测量了各种浓度的糖溶液,测量浓度可小于0.4%。本方法 相似文献
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W.W. Lui K. Magari N. Yoshimoto S. Oku T. Hirono K. Yokoyama W.-P. Huang 《Photonics Technology Letters, IEEE》1997,9(10):1379-1381
A theoretical model for bending waveguide based semiconductor polarization rotators has been established, which is based on the full-vectorial wave equations for bending waveguides and coupled-mode theory. Calculation results obtained using this model and measurement data are found to be in good agreement. 相似文献
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刘发林 《红外与毫米波学报》2000,19(2):149-152
针对NRD波导中不同半径的弯波导之间的耦合特性,提出了一种新的通用的分析方法,当耦合结构分别简化为非对称结构(即直波导与弯波导耦合)和对称结构(即两个半径相同的弯波导的耦合)时,该方法也可相应简化,与已有的分析结果完全一致。本文还就不同半径的弯波导构成的耦合器的频率响应和带宽特笥,在60GHz时给出实验验证,证实了本文所提方法的通用性和有效性。 相似文献
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Spiral optical waveguides can be used to provide moderately long delays for a variety of microwave applications. A brief analysis of the performance limitations of spiral delay lines is presented, together with loss measurement data for spirals having air-equivalent lengths as long as 46 cm. It is shown that the present limitation to longer delay lengths is the straight-guide loss of GaAs/AlGaAs waveguides, and not bending or intersectional losses.<> 相似文献
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The bending losses in rectangular dielectric waveguides deposited on a chemical mechanical polished (CMP) surface above the metal interconnect/interlayer dielectric stack of a processed Si wafer are modeled and estimated. CMP efficiently removes local topography and microroughness, but leaves long-range surface profile undulations due to variations in the metal pattern density. These surface undulations are then transferred to the waveguides deposited on this surface. A beam propagation method (BPM) waveguide simulation program and an equation for bending loss developed by Marcuse have been used to examine the bending losses seen by waveguides deposited on such a surface. In order to simplify the simulation of the bending losses of the waveguides, the undulations are modeled as a series of arcs, which is shown to be a good approximation. It was determined that under typical conditions, the bending losses may be ignored as they are less than 0.1 dB/cm, which is below the range of typical propagation losses for a straight guide. 相似文献
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High-density optical integrated circuits require curved waveguides with low radiation losses. The optimization of S-bend profiles that produce a minimum of pure bending losses is considered. The analytical profile that optimizes these losses in low-slope S-bends is presented, assuming an exponential representation for the bending losses per unit length. On the other hand, a numerical optimization procedure has been developed for curved waveguides with an arbitrary representation of the unitary bending losses. Some results are provided for LiNbO3 waveguides, including a comparison between the optimal profile and other usual S-bend profiles 相似文献
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Bending loss of high-silica single-mode bending optical waveguides using a waveguide side-wall as a reflecting facet is described theoretically and experimentally as a function of the bending angle. Two types of bending waveguides, which have the reflecting facet exposed to the air coated with a metal film, are treated. The causes of bending loss are discussed in terms of los due to the Goos-Hanchen effect and the perpendicularity and roughness of the reflecting facet 相似文献
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《Photonics Technology Letters, IEEE》2009,21(23):1779-1781
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ZENG Wen-hong LIAO Yun SHI Shuang-jin QIU Qi LI Wei 《半导体光子学与技术》2007,13(2):112-116
A new version of the scalar transverse electric(TE) wave equation in the bent waveguide is introduced. Then. TE polarized field in curved single-mode waveguides is analyzed by using the finite- difference beam propagation method(FD-BPM). The bending loss in bent waveguides is gotten for the optical fields obtained from BPM and comparisons are made among losses of the waveguides with various curvature radiuses, refractive index differences and cross sections. Based on the results, the design of spiral bent waveguide configuration is proposed as follows: refractive index difference being of 0. 007, both width and thickness of waveguides being of 6 μm, the curvature radius in the spiral centre being of 4 mm, and the bending loss coefficient of the designed spiral bent waveguide being of 0. 302 3 dB/cm. 相似文献
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An estimative procedure given recently for approximating radiation losses from indiffused waveguides is adapted to rib waveguides and compared with a recent Huygens-type solution for bending loss. The implications for the wider application of the estimative procedure are favourable 相似文献
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Curved dielectric optical waveguides suffer from radiation loss due to bending. To minimize the bending loss and reduce the radius of curvature, it is necessary to fabricate guides which provide strong optical confinement. This paper gives a brief review of curved waveguide analysis and presents some experimentally measured loss values for GaAs/GaAlAs curved rib waveguides. The rib waveguides, fabricated using ion beam milling, have a large rib height and are tightly guided structures. When corrected for reflection losses and input coupling efficiency, a minimum loss of approximately 3 dB has been achieved for a multimode 90° curved guide with a radius of curvature of 300 μm, and 8.5 dB for a single-mode curved guide with a radius of curvature of 400 μm. It is believed that most of this residual loss is not radiation loss due to bending, but rather scattering loss due to rib wall imperfections. 相似文献