A Linearization Analog Photonic Link With High Third-Order Intermodulation Distortion Suppression Based on Dual-Parallel Mach–Zehnder Modulator
A Linearization Analog Photonic Link With High Third-Order Intermodulation Distortion Suppression Based on Dual-Parallel Mach–Zehnder Modulator
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DOI：
10.1109/jphot.2015.2438445
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发表时间：
2015-06
影响因子：
2.4
通讯作者：
Wei Jiang;Qinggui Tan;Weize Qin;D. Liang;Xiaojun Li;Haihong Ma;Zhongbo Zhu
中科院分区：
文献类型：
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作者：
Wei Jiang;Qinggui Tan;Weize Qin;D. Liang;Xiaojun Li;Haihong Ma;Zhongbo Zhu
提出了一种基于双并行马赫-曾德尔调制器（DPMZM）实现高线性度模拟光链路的方案。通过仅使用两个具有π相移的电移相器并优化DPMZM的偏置，通过从理论上考虑产生三阶互调失真（IMD 3）的光谱中的所有边带，完全消除了IMD 3。在没有数字线性化、其他光学处理器和对称单边带调制的情况下，在DPMZM的一个子调制器中实现了光载波抑制（OCS），从而保证了信息传输的有效性。在DPMZM的另一个子调制器中实现正交调制，并且两个电极上的电信号相同，这导致操作简单。仿真结果表明，在11.9GHz和12 GHz两种频率的正弦电信号中，IMD 3被完全抑制，IMD 3在-120dBm的水平上低于本底噪声。仿真结果表明，IMD 3低于-120 dBm的本底噪声，与理论预测吻合较好。此外，IMD 3抑制约45 dB的实验证明，在本文中，无杂散动态范围提高了11.2 dB。Hz 2/3。该方案可以简化高线性度模拟光链路的设计，并使其稳定。
A scheme to realize a high linear analog photonic link based on a dual-parallel Mach-Zehnder modulator (DPMZM) is proposed and demonstrated in this paper. By using only two electrical phase shifters with π phase shift and optimizing the biases of the DPMZM, the third-order intermodulation distortion (IMD3) is completely eliminated by taking all the sidebands in the optical spectrum that produce IMD3 into consideration in theory. Without digital linearization, other optical processers, and symmetrical singlesideband modulation, optical carrier suppression (OCS) is achieved in one of the submodulators of DPMZM, which guarantees the effectiveness of information transmission. Quadrature modulation is achieved in the other submodulator of DPMZM, and the electrical signals on the two electrodes are the same, which result in a simple operation. The simulated results show that IMD3 is completely suppressed when the sinusoidal electrical signals have two tones, such as 11.9 and 12 GHz, and IMD3 is lower than the noise floor at the -120 dBm level. The simulated results show that IMD3 is lower than the noise floor with -120 dBm level, and the simulated results agree well with the theoretical prediction. In addition, IMD3 suppression of approximately 45 dB is experimentally demonstrated in this paper, and the spurious-free dynamic range is improved by 11.2 dB . Hz2/3. The scheme could simplify the design of a high linearized analog photonic link and make it stable.