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| Abstract: |
| To generate high-frequency radio frequency (RF) vector signals, a vector signal generation method by optical frequency sextupling using a dual-parallel modulator is proposed. The method modulates vector signal on +3rd order optical sideband and local oscillator (LO) signal on -3rd order sideband using the intermodulation process in the DPMZM. After suppressing of the optical carrier and other sidebands through proper adjustment for modulator biases and modulation index, a frequency sextupled millimeter-wave vector signal can be generated after photodetection. The frequency sextupling will lower the bandwidth of the modulator, the local oscillator and the driving circuits. In addition, the phase of generated signal is not distorted after detection, and the power fading after fiber transmission can be avoided. In the simulation, a 500-MSym/s QPSK signal at 60 GHz is generated by 10-GHz drive signal. After travelling over fiber with length of 20/30/40-km, receiver power penalty keeps below 2.5 dB. |
| Key words: dual-parallel Mach-Zehnder modulator (DPMZM) frequency multiplication frequency up-conversion vector signal radio over fiber (RoF) |
| DOI：10.11916/j.issn.1005-9113.17094 |
| Clc Number:TP92 |
| Fund: |
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| Descriptions in Chinese: |
| 面向光载射频系统的光子学六倍频矢量信号产生方案 王思阳，刘乃安 （西安电子科技大学 综合服务网络国家重点实验室，西安 710071） 创新点说明：提出一种面向光载射频系统的光子学六倍频矢量信号产生新方案，该方案结构简单，可通过光子学六倍频技术大幅度降低系统带宽需求，产生的矢量信号质量较好，可避免由光纤色散引起的周期性功率衰落，避免相位混叠。 研究目的： 利用光子学大带宽优势，实现60GHz频段矢量信号的光子学产生，降低调制器、本振、驱动电路的带宽，同时避免相位混叠和功率衰落。 研究方法： 通过理论分析与仿真验证相结合的方法。 结果： 1）经过0-40km光纤传输，矢量信号功率保持一致，说明该方案产生的矢量信号可以避免由光纤色散引起的周期性功率衰落。 2）产生的矢量信号解调后星座图完好，说明该矢量信号产生方法可避免相位混叠。 3）在保证误码率小于10-9情况下，与未光纤传输相比，光纤传输20、30、40km后接收机功率最大仅增加2.5dB，说明该方法产生的矢量信号质量较好，适合长距离光纤传输。 结论： 所提出的光子学矢量信号六倍频产生方案，结构简单，产生的矢量信号质量较好，可避免由光纤色散引起的周期性功率衰落，避免相位混叠，另外六倍频技术可大幅度降低系统的带宽需求。该方案有望应用于未来60GHz的宽带无线通信系统中。 关键词：双平行马增调制器；倍频；上变频；矢量信号；光载射频 |
