Radio-over-fiber transmission based on ultra-long distributed 2-order Raman amplifier
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摘要: 为了提升光载射频传输链路的链路增益以及传输距离，采用了L波段的超长分布式2阶喇曼放大器结构对光信号进行放大。从理论上对分布式2阶喇曼放大器以及光载射频传输链路的原理进行了解释，利用信号光、1阶抽运光、2阶抽运光以及噪声之间的耦合方程组分析了它们之间的关系，并且得到了基于超长分布式2阶喇曼放大器的光载射频传输系统的1阶射频信号增益。通过数值仿真以及系统实验得到了抽运功率大小对超长分布式2阶喇曼放大器的开关增益的影响、光载射频传输系统在0GHz~7GHz范围内的频率响应及其射频增益以及该光载射频传输链路在应用超长分布式2阶喇曼放大器后的相位噪声情况。结果表明，光载射频传输在超长分布式2阶喇曼放大器的作用下获得了28.1dB的链路增益，在距离为80.94km的光链路上实现了近似无损传输，射频信号开关增益与射频信号频率无关。该研究在光载射频链路的长距离传输中有重要的应用价值。
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关键词:
- 光纤放大器 /
- 光载射频传输 /
- 超长分布式2阶喇曼放大器 /
- 光纤色散 /
- 相位噪声
Abstract: In order to improve the link gain and transmission distance of radio-over-fiber (RoF) frequency transmission link, ultra-long distributed second-order Raman amplifier structure in L band was used to amplify the light signal. The principle of the distributed 2-order Raman amplifier and the RoF transmission link were explained theoretically. The relationships among them were analyzed by using the coupling equations between signal light, 1-order pumping light, 2-order pumping light and noise. The 1-order radio frequency (RF) signal gain of a RoF transmission system based on ultra-long distributed 2-order Raman amplifier was also obtained. Through numerical simulation and system experiment, the effect of pumping power on on-off gain of ultra-long distributed 2-order Raman amplifier, frequency response and RF gain of RoF transmission system in the range of 0GHz~7GHz, and phase noise of RoF transmission link after the application of ultra-long distributed 2-order Raman amplifier were obtained. The results show that the link gain of 28.1dB is obtained by RoF transmission after the application of an ultra-long distributed 2-order Raman amplifier. Approximate lossless transmission is achieved in optical link with a distance of 80.94km. The on-off gain of RF signal is independent of the frequency of RF signal. The study has important application value in long distance transmission of optical radio frequency links. -
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Figure 2. Radio-over-fiber transmission link model based on ultra-long distributed second-order Raman amplifier
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Figure 3. Relationship between distance and power of pumps, signal and noisewithin 80.94km under the first-order Raman amplifier
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Figure 4. Relationship between distance and power of pumps, signal and noise within 80.94km under the second-order Raman amplifier
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Figure 5. Simulation relationship between frequency and the first-order gain of radio-over-fiber transmission link ranging from 0GHz to 7GHz
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Figure 6. Radio-over-fiber transmission links based on ultra-long distributed second-order Raman amplifier
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Figure 7. Relationship between on-off gain of ultra-long distributed second-order Raman amplifier and pump power
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Figure 8. Experimental relationship between frequency and the first-order gain of radio-over-fiber transmission link ranging from 0GHz to 7GHz
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