低插损平坦谱响应阵列波导光栅解复用器优化设计

通过在输入波导与输入平板波导之间加入一种模式转换结构,获得了一个具有平坦光谱响应,低插损,光谱响应对称的阵列波导光栅型波分复用器,该模式转换结构由一个与输入波导的输出端连接的第一锥形波导,一个与此锥形波导输出端连接的细直波导,一个与细直波导输出端连接的第二个锥形波导以及一个连接输入平板波导和第二个锥形波导的梯形波导组成,通过优化设计梯形波导和第二个锥形波导的形状可以获得较宽的1dB通带带宽和较低的插损,同时光谱响应具有非常好的平坦性,而且通过对第一个锥形波导和细直波导的优化设计,在不引入明显的额外插损的条件下,能大大减小由于输入波导的弯曲引入的光谱响应的不平坦.

Optimum Design of AWG Router with Flattened Passband and Low Loss

By inserting a mode converted between the input waveguide and input slab,a low loss AWG router with the properties of flatened passband,low loss,low ripple and symmetrical frequency response is designed.The mode converter is constitute with the first taper,one thin straight waveguide,the second taper and the tapered waveguide.For the AWG router designed,the 1 dB bandwidth is optimized by optimizing the shape and length of the tapered waveguide,and the insertion loss and ripple of the frequency response are reduced by optimizing the shape of the second taper.Further more,the asymmetry of the frequency response caused by the curved input waveguide is reduced by optimizing the width of the thin straight waveguide.