| 摘要: |
| 微波光子技术凭借其带宽高、损耗低、重量轻、抗电磁干扰能力强等特点，有望突破传统技术瓶颈，满足未来卫星通信系统大容量、多功能、一体化的应用需求。针对宽带卫星通信系统中非线性失真问题，特别是未来通信系统的超宽带射频信号采集及超大规模的数据处理需求，基于偏振调制-相干I/Q解调，提出了一种光子带通采样且包含直接下变频功能的线性化方法，实现了系统三阶交调非线性失真下变频后30.55 dBm的失真抑制。实验证明了所提方法的有效性。此外，所提方法还可直接获取目标高频宽带的信息并将其数字化，避免了采用超宽带模数转换后所需的超大规模的数字处理，具有较好的应用潜力。 |
| 关键词: 宽带卫星通信 微波光子 线性化 |
| DOI： |
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| 基金项目: |
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| Microwave photonic linearization method for broadband satellite communication |
| NING Jieyu |
| (Southwest China Institute of Electronic Technology,Chengdu 610036,China) |
| Abstract: |
| By virtue of its remarkable advantages such as large bandwidth,low loss,light weight and immunity to electromagnetic interference,microwave photonics technology is expected to break through the bottleneck of traditional technology and meet the application requirements of large capacity,multi-function and integration of future satellite communication systems.For the multiple nonlinear distortion problem of the broadband satellite communication system,especially the ultra-wideband radio-frequency(RF) signal acquisition and super-large scale data processing requirements of the future communication system,a subsampled optical linearization method with directly down-conversion is proposed based on polarization-modulation and coherent optical in-phase/quadrature(I/Q) demodulation.By using this method,30.55 dBm suppression of the 3rd-order nonlinearities is achieved.The experiment shows the effectiveness of the proposed approach.In addition,the proposed method can also directly obtain the target high-frequency broadband information and digitize it,thus avoiding the super-large digital processing required by the use of ultra-wideband analog-to-digital conversion.The method has a good application potential in the future. |
| Key words: broadband satellite communication microwave photonics linearization |
