无磁性光子晶体类T型非互易性双通道滤波器设计

Design of T-Type Nonreciprocal Two Channel Filter Based on Non-Magnetic Photonic Crystal

基于无磁性二维光子晶体设计了一种由直线波导及矩形谐振腔构成的类T型非互易性双通道滤波器。矩形谐振腔具有局域多频率电磁波且电磁波传播方向可调的特性,直线波导的结构尺寸决定了其对不同对称性电磁波的承载能力。利用矩形谐振腔和直线波导的特性实现了非互易性双通道滤波功能。实验结果表明:正向传输情况下,滤波器实现了中心波长分别为1534 nm和1574 nm,带宽分别为16 nm和8 nm的滤波传输,对应的插入损耗分别为0.4 dB和0.36 dB,通道间隔离度为33 dB和22 dB;反向输入情况下,电磁波对称模式的不匹配导致无法传输。这表明设计的双通道非互易滤波器滤波效果良好,在未来全光通信集成领域具有潜在的应用价值。

In this paper,a Ttype nonreciprocal twochannel filter composed of straight waveguide and rectangular resonator is designed based on nonmagnetic twodimensional photonic crystal.The rectangular resonator has the characteristics of local multifrequency electromagnetic wave and the electromagnetic wave propagation direction is adjustable,and the structure size of the straight waveguide determines the carrying capacity of the electromagnetic waves with different symmetries.Nonreciprocal twochannel filtering function is realized using the characteristics of the rectangular resonator and straight waveguide.The experimental results show that,in the case of forward transmission,the filter achieves filter transmission with central wavelengths of 1534 nm and 1574 nm,and 16 nm and 8 nm bandwidth,respectively,corresponding to the insertion loss of 0.4 dB and 0.36 dB,respectively,and interchannel isolation of 33 dB and 22 dB.In the case of backward input,the mismatch of the electromagnetic wave symmetry mode causes no transmission,which shows that the designed dualchannel nonreciprocal filter has a good filtering effect and contributes to the development of the future alloptical communication integration field.