光子信道化接收技术研究

发布时间：2018-06-26 22:34

  本文选题：四波混频 + 周期性滤波器　； 参考：《电子科技大学》2014年硕士论文

【摘要】：随着信息技术的迅速发展与不断进步,信号环境也变得越来越复杂。不仅频率覆盖范围大,且同一时刻可能有多个信号同时出现。信道化是实现宽带射频(RF)接收的一种有效方式,且具有良好的处理同时到达信号的能力。传统的信道化过程多在电域完成,所需器件较多,结构复杂而且体积庞大,也无法满足日益增加的带宽需求。而光子学的方法不仅具有带宽大、重量轻的优点,并且损耗低、抗电磁干扰能力强,因此它能够很好的解决“电子瓶颈问题”。本文将光子链路与信道化技术相结合,研究了一种基于光纤四波混频(FWM)和周期性滤波器的光子学信道化接收方案。整个接收系统复杂度大大降低,通过调节几个关键参数,可以弥补滤波器可能存在的误差。此外,由于该方案工作于有源模式,因而消除了无源器件引起的插入损耗。本文的主要内容如下:1)对基于光纤FWM效应的信号组播系统进行仿真分析。结果表明,加载了数字信号的RF信号经过系统后成功实现了多路组播。然后采用等幅双音法讨论分析了系统的三阶互调失真情况。各拷贝的输出功率随输入信号的变化曲线表明,各拷贝的输入功率与信号输入功率呈线性关系。与背靠背三阶互调输入截点相比,各拷贝的三阶互调截点在小范围内进行波动。因此,该系统可对RF信号进行低失真线性组播。2)对基于光纤FWM效应的光子信道化接收系统进行仿真分析。在第三章上,在Optisystem仿真软件中搭建光子信道化系统对方案的可行性进行仿真验证。对其中四路拷贝进行分析,仿真结果表明该系统利用单个周期性滤波器可成功实现信号的信道化接收。3)在理论及仿真分析的基础上,进行实验分析。首先,在两路光输入情况下,分别测试了功率与波长间隔对FWM的影响。结果表明,增大泵浦功率,有利于产生高阶泵浦。同等条件下增大泵浦波长间隔,FWM效率会有所降低。其次,分析了未加调制信息时,小功率信号光的组播情况。实验结果中其中五个信号拷贝的功率波动小于2.5 dB,信噪比约为20 dB。最后,当信号光上加载10 GHz的RF信号时,分析信号光组播效果。可明显看出输出光谱中信号拷贝复制了信号光携带的信息。
[Abstract]:With the rapid development and progress of information technology, the signal environment is becoming more and more complex. Not only is the frequency coverage wide, but multiple signals may appear simultaneously at the same time. Channelization is an effective way to realize wideband radio frequency (RF) reception, and it has a good ability to process simultaneous arrival signals. The traditional channelization process is mostly completed in the electrical domain, the devices needed are more, the structure is complex and the volume is huge, and it can not meet the increasing demand of bandwidth. The photonics method not only has the advantages of large bandwidth, light weight, but also low loss, strong anti-electromagnetic interference ability, so it can solve the "electronic bottleneck problem" very well. In this paper, the photonic link is combined with channelization technology to study a photonics channelized reception scheme based on fiber-optic four-wave mixing (FWM) and periodic filter. The complexity of the whole receiver system is greatly reduced. By adjusting several key parameters, the possible error of the filter can be compensated. In addition, because the scheme works in active mode, the insertion loss caused by passive devices is eliminated. The main contents of this paper are as follows: 1) the signal multicast system based on fiber-optic FWM effect is simulated and analyzed. The results show that the RF signal loaded with digital signal is successfully multicast after the system. Then the third order Intermodulation distortion of the system is discussed and analyzed by using the equal amplitude double tone method. The curve of the output power of each copy with the input signal shows that the input power of each copy is linearly related to the input power of the signal. Compared with the back-to-back third order Intermodulation input intercept, the third order Intermodulation intercept of each copy fluctuates in a small range. Therefore, the system can simulate and analyze the photonic channelized receiving system based on fiber FWM effect by low distortion linear multicast of RF signal. In the third chapter, a photon channelization system is built in the Optisystem simulation software to verify the feasibility of the scheme. The simulation results show that the system can successfully realize the channelization of signal by using a single periodic filter. Firstly, the influence of power and wavelength spacing on FWM is tested in the case of two optical inputs. The results show that the higher pump power can be obtained by increasing the pump power. Under the same conditions, the efficiency of FWM will be decreased by increasing the pump wavelength spacing. Secondly, the multicast of low power signal light without modulation information is analyzed. In the experimental results, the power fluctuation of five copy signals is less than 2.5 dB, and the signal-to-noise ratio is about 20 dB. Finally, when the 10 GHz RF signal is loaded on the signal light, the signal optical multicast effect is analyzed. It is obvious that the signal copy in the output spectrum duplicates the information carried by the signal light.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN851
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本文编号：2071648