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全光缓存器是未来全光网络中不可或缺的关键器件。针对可控光延迟和光存储的应用需求,研究了光子晶体波导中慢光传输的外部动态调制。设计了一种新型的聚合物光子晶体波导结构。用平面波展开法仿真得到该波导结构带隙中存在单一的TE导模,导模带边处的群速度可达10~(-2)c。由于基底聚合物材料具有高电光系数和瞬态的电光响应时间,且导模慢光传输产生的电磁场局域对电光效应有增强作用,可在低调制电压的条件下实现对慢光导模的大范围动态调制。数值分析得到在外加调制电压为80 V时导模带边波长的移动幅度达80.8 nm。慢光导模的移动随调制电压的变化基本呈线性关系,且调制的灵敏度约为1 nm/V。这种线性的外部动态调制基本可满足全光网络对慢光光缓存的需求。
All-optical buffer is an indispensable key device in the future all-optical network. In view of the application requirements of controllable optical delay and optical storage, the external dynamic modulation of slow optical transmission in photonic crystal waveguides is studied. A novel polymer photonic crystal waveguide structure is designed. The planar TE wave propagation method was used to simulate the existence of a single TE guided mode band gap in the waveguide structure. The group velocity at the edge of the guided mode band was up to 10 ~ (-2) c. Because of the high electro-optic coefficient and the transient electro-optic response time of the base polymer material, and the electro-optic effect caused by the slow optical transmission of the guided mode, the electro-optical effect can be enhanced at a low modulation voltage. Range dynamic modulation. The numerical analysis shows that the moving distance of the guide mode edge wavelength reaches 80.8 nm when the applied modulation voltage is 80 V. The movement of slow light guide mode is basically linear with the modulation voltage, and the sensitivity of modulation is about 1 nm / V. This linear external dynamic modulation basically meets the demand of all-optical network for slow optical optical buffer.