基于Mach-Zehnder结构微环谐振腔全光逻辑门的研究

Study on Mach-Zehnder type all optical logic gate based on microring resonator

为了解决全光逻辑门结构所需抽运能量过大的问题,提出了一种基于Mach-Zehnder结构微环谐振腔的全光控制逻辑门结构。通过在微环波导上加入空气孔加强对光的限制,增强了带边附近的3阶非线性效应,从而减小达到所需相移的抽运能量。将微环谐振腔与Mach-Zehnder结构结合,采用光学Kerr效应控制不同微环内相移的改变,从而实现不同逻辑门功能。同时进行了理论分析与仿真验证,计算了不同尺寸空气孔对于结构的影响,并对于不同逻辑功能的控制方法,验证了结构的可行性。结果表明,这种逻辑门结构所需抽运能量不超过10dBm,延迟处于皮秒量级,速度快,器件的尺寸处于微米量级,该结构可以同时实现不同的逻辑门状态,对于全光网络的研究有指导意义。

In order to solve the problem of high pump power of logic gates, a novel Mach-Zehnder type all optical logic gate based on micro-ring resonator was proposed. The periodical patterns of air holes added in the micro-ring waveguide provide strong confinement on light, which enhances the third order nonlinear Kerr effect around the band edge and decreases the pump power of phase shift. Combining micro-ring resonator with Mach-Zehnder structure, different logic function can be realized with the phase shift in the different micro-rings controlled by Kerr effect. The impact of the different size of air holes on the structure was calculated and the detailed control methods of the logic gates were verified. The feasibility was proved. The simulation results show that this device possesses several practical advantages, such as low power consumption of less than lOdBm, delay of ps order, high speed data processing ability and μm order dimension. The device achieves the different kinds of logic gates and has the guiding significance to all optical networks.