Fig. 1. Schematic diagram of the proposed microwave waveform generator based on dual-wavelength time domain synthesis technology. LD, laser diode; WDM, wavelength division multiplexer; PC, polarization controller; OC, 3 dB optical coupler; MZM, Mach-Zehnder modulator; ODL, optical delay line; AMP, amplifier.基于双波长时域合成技术的微波波形发生器原理图, 图中LD为激光器, WDM为波分复用器, PC为偏振控制器, OC为3 dB光耦合器, MZM为马赫-曾德尔调制器, ODL为光延时线, AMP为微波放大器

Fig. 2. Comparison of ideal square waveform (dotted line) and three-order square waveform with β of 2.3 (solid line). 时生成的三阶方波(实线)与理想方波(虚线)的波形图

Fig. 3. Comparison of ideal sawtooth waveform (dotted line and three-order sawtooth waveform (solid line).三阶锯齿波(实线)与理想锯齿波(虚线)的波形图

Fig. 4. Comparison of ideal triangle waveform (dotted line) and three-order triangle waveform with β of 1.511 (solid line). 时生成的三角波(实线)与理想三角波(虚线)的波形图

Fig. 5. (a), (b) Generated square waveform with a repetition rate of 2.5 GHz, and (c) its spectrum.2.5 GHz重复频率的方波信号　(a), (b)时域波形图; (c)频谱图

Fig. 6. (a) Generated double-frequency waveform and (b) its spectrum in output port of MZM2.MZM2的输出端的倍频信号　(a) 时域波形图; (b) 频谱图

Fig. 7. (a) Generated sawtooth waveform with a repetition rate of 2.5 GHz, and (b) its spectrum.2.5 GHz重复频率的锯齿波信号　(a) 时域波形图; (b) 频谱图

Fig. 8. (a) Generated reverse sawtooth waveform with a repetition rate of 2.5 GHz, and (b) its spectrum.2.5 GHz重复频率的反向对称锯齿波信号　(a)时域波形图; (b)频谱图

Fig. 9. (a) Generated triangular waveform with a repetition rate of 2.5 GHz, and (b) its spectrum.2.5 GHz重复频率的三角波信号　(a)时域波形图; (b)频谱图

Fig. 10. Generated (a) square waveform, (b) sawtooth waveform, (c) triangular waveform with a repetition rate of 5 GHz.5 GHz重复频率的(a)方波信号, (b)三角波信号, (c)三角波信号时域波形图