通过抑制微波光子链路中的非线性失真因子可以提高MPL的带宽和无杂散动态范围(SFDR)。提出了一种基于双电极马赫-曾德尔调制器和平衡探测的线性化方案,该方案结合了相位控制,优化偏置电压以及平衡探测技术,理论分析结果显示,系统可消除二阶谐波失真(HD2),抑制三阶交调失真(IMD3)和五阶交调失真(IMD5)。利用OptiSystem软件进行了仿真分析,结果显示:二阶交调失真和HD2被完全消除,IMD3和IMD5被抑制在基底噪声以下,其中,IMD3被抑制约45.76 dB,三阶SFDR达到114 dB·Hz 2/3,五阶SFDR达到137.97 dB·Hz 4/5。

The bandwidth and spurious-free dynamic range (SFDR) of the microwave photonic link can be improved by suppressing the nonlinear distortion factor in the microwave photonic link. A linearization scheme based on double-electrode Mach-Zehnder modulator and balanced detection is proposed. This scheme combines phase control, optimized bias voltage, and balanced detection techniques. Theoretical analysis results show that the proposed system can eliminate second-order harmonic distortion(HD2), as well as suppress third-order inter-modulation distortion(IMD3) and fifth-order inter-modulation distortion(IMD5). Simulation analysis carried out on OptiSystem programming environment shows that the second-order inter-modulation distortion and HD2 are completely eliminated, and IMD3 and IMD5 are mainly suppressed under the background noise. Among them,the IMD3 is suppressed by about 45.76 dB, the third-order SFDR reaches 114 dB·Hz ^2/3, and the fifth-order SFDR reaches 137.97 dB·Hz ^4/5.