本文選題：四波混頻 + 周期性濾波器�。� 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：隨著信息技術(shù)的迅速發(fā)展與不斷進(jìn)步,信號(hào)環(huán)境也變得越來越復(fù)雜。不僅頻率覆蓋范圍大,且同一時(shí)刻可能有多個(gè)信號(hào)同時(shí)出現(xiàn)。信道化是實(shí)現(xiàn)寬帶射頻(RF)接收的一種有效方式,且具有良好的處理同時(shí)到達(dá)信號(hào)的能力。傳統(tǒng)的信道化過程多在電域完成,所需器件較多,結(jié)構(gòu)復(fù)雜而且體積龐大,也無法滿足日益增加的帶寬需求。而光子學(xué)的方法不僅具有帶寬大、重量輕的優(yōu)點(diǎn),并且損耗低、抗電磁干擾能力強(qiáng),因此它能夠很好的解決“電子瓶頸問題”。本文將光子鏈路與信道化技術(shù)相結(jié)合,研究了一種基于光纖四波混頻(FWM)和周期性濾波器的光子學(xué)信道化接收方案。整個(gè)接收系統(tǒng)復(fù)雜度大大降低,通過調(diào)節(jié)幾個(gè)關(guān)鍵參數(shù),可以彌補(bǔ)濾波器可能存在的誤差。此外,由于該方案工作于有源模式,因而消除了無源器件引起的插入損耗。本文的主要內(nèi)容如下:1)對(duì)基于光纖FWM效應(yīng)的信號(hào)組播系統(tǒng)進(jìn)行仿真分析。結(jié)果表明,加載了數(shù)字信號(hào)的RF信號(hào)經(jīng)過系統(tǒng)后成功實(shí)現(xiàn)了多路組播。然后采用等幅雙音法討論分析了系統(tǒng)的三階互調(diào)失真情況。各拷貝的輸出功率隨輸入信號(hào)的變化曲線表明,各拷貝的輸入功率與信號(hào)輸入功率呈線性關(guān)系。與背靠背三階互調(diào)輸入截點(diǎn)相比,各拷貝的三階互調(diào)截點(diǎn)在小范圍內(nèi)進(jìn)行波動(dòng)。因此,該系統(tǒng)可對(duì)RF信號(hào)進(jìn)行低失真線性組播。2)對(duì)基于光纖FWM效應(yīng)的光子信道化接收系統(tǒng)進(jìn)行仿真分析。在第三章上,在Optisystem仿真軟件中搭建光子信道化系統(tǒng)對(duì)方案的可行性進(jìn)行仿真驗(yàn)證。對(duì)其中四路拷貝進(jìn)行分析,仿真結(jié)果表明該系統(tǒng)利用單個(gè)周期性濾波器可成功實(shí)現(xiàn)信號(hào)的信道化接收。3)在理論及仿真分析的基礎(chǔ)上,進(jìn)行實(shí)驗(yàn)分析。首先,在兩路光輸入情況下,分別測試了功率與波長間隔對(duì)FWM的影響。結(jié)果表明,增大泵浦功率,有利于產(chǎn)生高階泵浦。同等條件下增大泵浦波長間隔,FWM效率會(huì)有所降低。其次,分析了未加調(diào)制信息時(shí),小功率信號(hào)光的組播情況。實(shí)驗(yàn)結(jié)果中其中五個(gè)信號(hào)拷貝的功率波動(dòng)小于2.5 dB,信噪比約為20 dB。最后,當(dāng)信號(hào)光上加載10 GHz的RF信號(hào)時(shí),分析信號(hào)光組播效果�？擅黠@看出輸出光譜中信號(hào)拷貝復(fù)制了信號(hào)光攜帶的信息。
[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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN851
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本文編號(hào)：2071648