Dai Zuoxing, Wang Jiali, Heng Yan
School of Mechano-Electronic Engineering, XiDian University, 2 South Taibai Road, Xi’an, Shaanxi 710071, China.
Opt Express. 2011 Feb 14;19(4):3667-76. doi: 10.1364/OE.19.003667.
A method for synthesizing bandpass photonic crystal filters for wavelength division multiplexing (WDM) systems is presented. The proposed method permits the calculation of the physical dimensions of the crystalline structures given the desired frequency response of the filter in terms of bandwidth, in-band ripple, minimum out-of-band attenuation, and central frequency. The method, explained in detail for Chebyshev frequency responses, is equivalent circuit based. The resulting devices are very compact, have a high out-of-band attenuation, and are suitable for high density photonic integrated circuits. The validity of the proposed method is confirmed through contrasting the simulation concluded from the finite-difference time-domain (FDTD) method by the design of a third-order Chebyshev filter having a center frequency of 1 THz, a flat bandwidth of 4 GHz, and ripples of 0.5 dB in the passband.
提出了一种用于波分复用（WDM）系统的带通光子晶体滤波器的合成方法。给定滤波器在带宽、带内纹波、最小带外衰减和中心频率方面的期望频率响应，该方法允许计算晶体结构的物理尺寸。针对切比雪夫频率响应详细解释的该方法基于等效电路。所得器件非常紧凑，具有高带外衰减，并且适用于高密度光子集成电路。通过设计一个中心频率为1太赫兹、平坦带宽为4吉赫兹且通带纹波为0.5分贝的三阶切比雪夫滤波器，将从时域有限差分（FDTD）方法得出的模拟结果进行对比，从而证实了所提方法的有效性。
