Ultra Broadband Predistortion Circuit for Radio-over-Fiber Transmission Systems

Ultra Broadband Predistortion Circuit for Radio-over-Fiber Transmission Systems
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用于光纤无线电传输系统的超宽带预失真电路

DOI:
10.1109/jlt.2016.2604395
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发表时间:
2016-11
期刊:
IEEE Journal of Light wave Technology
影响因子:
--
通讯作者:
Ye Zhang
Ye Zhang
中科院分区:
其他
文献类型:
--
作者:
Ran Zhu;Xiupu Zhang;Dongya Shen;Ye Zhang

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基于双肖特基二极管的超宽带预失真电路(PDC)经过设计和实验验证,可线性化直接调制和外部调制的光纤无线电(RoF)传输系统。 PDC 中使用单片双肖特基二极管,以减少占位面积并提高带宽。测量的 S 参数表明该电路能够工作在高达 40 GHz 的频率下。建立了PDC产生三阶互调失真(IMD3)的理论,计算结果与实测结果吻合较好。使用两种措施来验证 PDC:2.4 GHz WiFi 信号的无杂散动态范围 (SFDR) 和误差矢量幅度 (EVM)。对于由 PDC 线性化的直接调制 RoF 传输,SFDR 提高了约 12 dB。对于由 PDC 线性化的外部马赫-曾德调制器 (MZM) 调制的 RoF 传输,SFDR 在 2 至 30 GHz 范围内提高了 5 dB 以上,特别是在 2 GHz 至 5 GHz 范围内提高了 12 dB 以上。对于通过 PDC 线性化的外部调制 RoF 传输的 2.4 GHz WiFi 信号,WiFi 信号的 EVM 在背靠背情况下提高了 5.1 dB,在 20 公里 SMF 传输情况下提高了 3.5 dB。
A dual Schottky diode-based ultrabroadband predistortion circuit (PDC) is designed and experimentally verified to linearize both directly and externally modulated radio-over-fiber (RoF) transmission systems. A monolithic dual Schottky diode is used in the PDC to reduce the footprint and improve the bandwidth. The measured S-parameters show that the circuit is able to work for up to 40 GHz. The theory of third order intermodulation distortion (IMD3) generation by the PDC is established, and calculated IMD3 agrees well with the measured. Two measures are used to verify the PDC: spurious-free dynamic range (SFDR) and error vector magnitude (EVM) for WiFi signal at 2.4 GHz. For a directly modulated RoF transmission linearized by the PDC, the SFDR is improved by ~12 dB. For an externally Mach-Zehnder modulator (MZM) modulated RoF transmission linearized by the PDC, the SFDR is improved by higher than 5 dB from 2 to 30 GHz, and in particular higher than 12 dB from 2 to 5 GHz. For 2.4-GHz WiFi signal over the externally modulated RoF transmission linearized by the PDC, the EVM for WiFi signal is improved by up to 5.1 dB for back-to-back and 3.5 dB for 20-km SMF transmission.
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