论文部分内容阅读
首先，我们利用光学Kerr效应设计了一种基于周期性介质波导的全光开关。其次，我们分析比较了考虑厚度的slab结构光开关的透射特性，决定利用二维光子晶体实现集成。接着，我们通过调整光子晶体波导的参数，得到一个有低群速度，低色散的平坦区域。然后，我们给两个结构设置了合理的参数，使全光开关的信号光通道在慢光波导的平坦带内，可以保证信号光经过光开关后可以被后面结构慢下来。另外，在两个器件连接处，选择一种合适的结构，保证信号光能高效的从光开关耦合到慢光波导里，最终我们完成了两个元件的集成。当信号光需要被延迟时，让光开关为“开通”状态，信号光就可以通过整个集成器件被慢下来。如果信号光不需要延迟，那么让光开关为“关闭”状态就可以。最后我们给出了光脉冲在全光开关结构和慢光结构中传播的仿真波形，来演示集成器件的复合功能。“,”First, we design an all-optical switch based on periodic dielectric waveguide using the optical Kerr effect. Second, we research the transmission property of slab structure optical switch, considering the thickness of dielectric. Then we choose the two dimensions photonic crystal to analyze the integration of devices. And we properly tune the structural parameters of photonic crystal waveguide, to achieve a flattened band with low group velocity and vanishing Group Velocity Dispersion. Then we set the proper parameters of two structures to make sure that the signal channel of optical switch is in the flat band of slow light waveguide, so the signal can be slowed down after pass through the optical switch. In addition, we choose the proper connection structure of the joint, to make the signal light couple into the slow light waveguide from optical switch efficiently. Ultimately we implement the integration of two elements. When the signal light needs to be delayed, we can put the optical switch “on”, then the signal light pass through the integrated device and it is slowed. If the signal needs no delay, we can put the optical switch“off”. At the end, we show simulation of the light propagation in both the optical switch and the slow light structure to demonstrate the compound function of integrated devices.