Research on the performance improvement of microwave photonic frequency down-conversion link

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI:10.1117/12.3006437

Xianzhi Wu, Lingjie Zhang, Zhiyao Zhang, Shang-jian Zhang, Yong Liu

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Abstract

Performance improvement of microwave photonic frequency down-conversion link is investigated both in simulation and experiment. To achieve maximum signal-to-noise ratio, a dual-drive Mach-Zehnder modulator (DDMZM) biased at the minimum transmission point and an erbium-doped fiber amplifier (EDFA) are employed to boost the power of the first-order modulation sidebands. The power spectrum density of the output noise is limited by the thermal noise and relative intensity noise (RIN) with low and high gain of EDFA, respectively. Correspondingly, the output noise figure (NF) decreases rapidly in the case of a thermal-noise-dominant noise floor and remains stable in RIN-dominant noise floor situations. When the local oscillation (LO) and the radio frequency (RF) signal powers are set to be 10 dBm and the input optical power before photodetector (PD) is amplified to be 20 dBm, an intermediate frequency signal with a high power of 10.8 dBm is obtained. When LO/RF power is set to be 0 dBm and the amplified optical power entering the PD is 16 dBm, the NF of the proposed link is measured as 31.5 dB, which is 14 dB lower than the link without EDFA, while the conversion gain has improved to 12 dB with an increase of 57.2 dB. Finally, the spurious-free dynamic range of the link is measured as 113.3 dB·Hz 2/3 when the power of the LO signal is 0 dBm and the gain of EDFA is 18 dB.

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微波光子频率下变频链路性能改进研究

通过模拟和实验研究了微波光子频率下变频链路的性能改进。为实现最大信噪比，采用了偏置在最小传输点的双驱动马赫-泽恩德调制器（DDMZM）和掺铒光纤放大器（EDFA）来提高一阶调制边带的功率。输出噪声的功率谱密度分别受到 EDFA 低增益和高增益时的热噪声和相对强度噪声（RIN）的限制。相应地，输出噪声系数（NF）在热噪声占主导地位的本底噪声情况下迅速降低，而在 RIN 占主导地位的本底噪声情况下保持稳定。当本地振荡（LO）和射频（RF）信号功率设为 10 dBm，光电探测器（PD）放大前的输入光功率设为 20 dBm 时，可获得高功率为 10.8 dBm 的中频信号。当 LO/RF 功率设为 0 dBm，进入光电探测器的放大光功率为 16 dBm 时，测得拟议链路的无噪声系数为 31.5 dB，比不使用 EDFA 的链路低 14 dB，而转换增益提高到 12 dB，增加了 57.2 dB。最后，当 LO 信号功率为 0 dBm、EDFA 增益为 18 dB 时，测得链路的无杂散动态范围为 113.3 dB-Hz 2/3。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Optics and Photonics China

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