Integrated Programmable Microwave Photonic Filter with High Shape-factor
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摘要: 为了适应新型通信技术发展，该文提出了一种高形状因子、可编程的微波光子滤波器集成芯片。该滤波器芯片采用绝缘体上硅材料(SOI)，利用有限冲击响应原理，通过调节各支路上的热光调制器，可以实现带宽可调、形状因子大于0.55的滤波曲线，以及中心频率可调、带宽可调和滤波形状可变3种不同滤波功能。该滤波器尺寸小、重量轻、灵活性高，能适用于大带宽信号处理，并能提供一种理想的信道划分方式，可广泛应用于国防领域和5G网络中。Abstract: In order to accommodate the development of new communication technology, an integrated programmable microwave photonic filter with high shape-factor is proposed in this paper. This filter is based on Silicon-On-Insulator (SOI) and an eight-tap finite impulse response. By controlling the thermal heaters on the amplitude modulator and phase modulator of each tap, a rectangular filter with tunable bandwidth and high shape-factor greater than 0.55 is obtained. Furthermore, the tunability of central frequency, bandwidth and variable pass-band shape can be also realized. Small size, light weight and flexibility are advantages of the preposed filters, moreover, it can be applied to large bandwidth signal processing and an alternative method to part the channels. So it can be widely used in defense field and 5G networks.
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Key words:
- Microwave photonic filter /
- High shape-factor /
- Programmable filter
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表 1 带宽可调、高形状因子滤波器幅度调制阵列、相位调制阵列取值及相关特性参数
编号 1 2 3 4 5 6 7 8 幅度调制阵列 ${\alpha _1}$ 0.38 0.47 0.38 0.45 0.58 0.80 1.00 1.00 ${\alpha _2}$ 0.65 0.83 0.85 1.00 1.00 1.00 0.80 0.35 ${\alpha _3}$ 0.87 1.00 1.00 0.92 0.44 0.02 0.34 0.27 ${\alpha _4}$ 1.00 0.89 0.66 0.20 0.29 0.31 0.02 0.20 ${\alpha _5}$ 1.00 0.54 0.08 0.35 0.18 0.20 0.14 0.13 ${\alpha _6}$ 0.87 0.12 0.31 0.27 0.20 0.04 0.17 0.07 ${\alpha _7}$ 0.65 0.19 0.29 0.16 0.06 0.16 0.11 0.01 ${\alpha _8}$ 0.38 0.28 0.03 0.20 0.15 0.09 0.01 0.03 相位调制阵列 ${\phi _1}$ 0 0.04${\text{π}}$ 0.97${\text{π}}$ 0.91${\text{π}}$ 0.98${\text{π}}$ 0.69${\text{π}}$ 0.98${\text{π}}$ 0.98${\text{π}}$ ${\phi _2}$ 0.02${\text{π}}$ 0.11${\text{π}}$ 0.98${\text{π}}$ 0.92${\text{π}}$ 0 0.76${\text{π}}$ 0 0 ${\phi _3}$ 0.03${\text{π}}$ 0.19${\text{π}}$ 0 0.94${\text{π}}$ 0.02${\text{π}}$ 0.37${\text{π}}$ 0.52${\text{π}}$ 0.52${\text{π}}$ ${\phi _4}$ 0.05${\text{π}}$ 0.27${\text{π}}$ 0.02${\text{π}}$ 0.95${\text{π}}$ 0.53${\text{π}}$ 0.43${\text{π}}$ 0.03${\text{π}}$ 0.03${\text{π}}$ ${\phi _5}$ 0.06${\text{π}}$ 0.35${\text{π}}$ 0.03${\text{π}}$ 0.47${\text{π}}$ 0.55${\text{π}}$ 0 0.05${\text{π}}$ 0.55${\text{π}}$ ${\phi _6}$ 0.08${\text{π}}$ 0.42${\text{π}}$ 0.55${\text{π}}$ 0.48${\text{π}}$ 0.06${\text{π}}$ 0.09${\text{π}}$ 0.56${\text{π}}$ 0.06${\text{π}}$ ${\phi _7}$ 0.09${\text{π}}$ 0 0.56${\text{π}}$ 0 0.08${\text{π}}$ 0.66${\text{π}}$ 0.08${\text{π}}$ 0.58${\text{π}}$ ${\phi _8}$ 0.10${\text{π}}$ 0.08${\text{π}}$ 0.58${\text{π}}$ 0.02${\text{π}}$ 0.59${\text{π}}$ 0.23${\text{π}}$ 0.59${\text{π}}$ 0.59${\text{π}}$ 3 dB带宽(GHz) 1.34 2.58 3.29 4.40 5.53 6.58 7.60 8.64 形状因子 0.55 0.64 0.68 0.75 0.80 0.83 0.85 0.88 
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表 2 滤波形状可变滤波器幅度调制阵列、相位调制阵列取值和仿真所得曲线与理想曲线的平均误差
滤波曲线类型 三角形 锯齿形 高斯形 超高斯形 幅度调制系数 ${\alpha _1}$ 0.45 0.54 0.10 0.15 ${\alpha _2}$ 1.00 1.00 0.41 0.60 ${\alpha _3}$ 0.71 0.8 0.83 1.00 ${\alpha _4}$ 0.13 0.43 1.00 0.83 ${\alpha _5}$ 0.04 0.35 0.74 0.32 ${\alpha _6}$ 0.08 0.25 0.35 0.06 ${\alpha _7}$ 0.01 0.21 0.12 0.01 ${\alpha _8}$ 0.02 0.17 0.03 0.02 相位调制系数(${\text{π}}$) ${\phi _1}$ 0 0 0 0.98 ${\phi _2}$ 0.02 0.10 0.02 0 ${\phi _3}$ 0.03 0.23 0.03 0.03 ${\phi _4}$ 0.05 0.47 0.05 0.05 ${\phi _5}$ 0.06 0.75 0.06 0.06 ${\phi _6}$ 0.08 0.03 0.08 0.02 ${\phi _7}$ 0.09 0.32 0.09 0.74 ${\phi _8}$ 0.11 0.59 0.11 0.66 平均误差(%) 0.71 5.76 0.07 0.10
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