Ge_(20)Sb_(15)Se_(65)硫系脊形光波导的色散特性  

Dispersion Characteristics of Ge_(20)Sb_(15)Se_(65) Chalcogenide Rib Waveguides

作　　者：刘珊[1] 沈祥[1] 徐铁峰[1] 陈昱[1] 陈芬[1] 李军[1] 戴世勋[1] 聂秋华[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《光学学报》2013年第5期142-147,共6页Acta Optica Sinica

基　　金：国家科技部重大国际合作项目(2011DFA12040);国家973计划(2012CB722703);国家自然科学基金(61008041;60978058);宁波市自然科学基金(2011A610092);宁波大学王宽诚幸福基金资助课题

摘　　要：采用有限差分方法计算出Ge20Sb15Se65脊形波导的有效模式折射率,系统地分析了1550nm光通信波长上的波导准TM基模的群速度色散特性与波导关键结构参数之间的关系。大量模拟结果表明:较大的材料色散可以通过设计亚微米波导结构得到降低。在脊宽和脊高分别控制在500～900nm和400～1000nm范围内的情况下,通过增大波导的刻蚀深度能获得零色散甚至反常色散。另外,波导脊高变化比脊宽变化对色散的影响更大。研究结果为应用于非线性全光器件的硫系光波导提供了尺寸设计和色散管理的依据,对用于全光信号处理的硫系玻璃光波导器件的设计具有一定的参考价值。The model effective index for Ge20 Sb5 Se6 rib waveguides are calculated using the finite difference method. The group velocity dispersion properties of the quasi-TM single polarization of waveguides are systematically studied around the optical fiber communication wavelength （1550 rim）, and their relationship with the key structural parameters of the waveguide is also studied. Extensive simulation results show that the larger material dispersion can be reduced through the design of sub-micron waveguide structure. The rib width and height are controlled in the range of 500-900 nm and 400-1000 nm, respectively, zero dispersion or anomalous dispersion can be obtained by increasing the etched depth. In addition, the impact of rib width on dispersion is less obvious than that of rib height. The investigation results provide the basis of the size design and dispersion management for the chalcogenide optical waveguide applied to nonlinear all-optical devices. The results have some reference value to the design of chalcogenide glass optical waveguide devices used in all-optical signal processing.

关 键 词：集成光学 群速度色散 有限差分法 硫系玻璃 非线性光器件 

分 类 号：O436.3[机械工程—光学工程]