基于光梳的奈奎斯特脈沖信號(hào)生成技術(shù)研究
發(fā)布時(shí)間：2018-10-16 16:51
【摘要】：微波光子學(xué)是融合了微波技術(shù)與光學(xué)技術(shù)的新型交叉學(xué)科,近幾十年發(fā)展尤為迅速,其應(yīng)用涉及到微波和光學(xué)領(lǐng)域的各個(gè)方面。光奈奎斯特脈沖是微波光子學(xué)信號(hào)生成中的關(guān)鍵技術(shù)之一。隨著“互聯(lián)網(wǎng)+”時(shí)代的到來(lái),作為互聯(lián)網(wǎng)和通信網(wǎng)基礎(chǔ)的光傳輸網(wǎng)絡(luò)面臨的壓力越來(lái)越大,擴(kuò)容措施刻不容緩。通常人們采用增加信道帶寬的辦法,但是頻率資源是有限的,因此人們開始研究如何提高頻譜利用效率。理論上奈奎斯特信號(hào)具有最小的信號(hào)帶寬,但是受到電子器件帶寬及采樣速率的限制,在電域很難產(chǎn)生高速信號(hào),而全光奈奎斯特信號(hào)既能實(shí)現(xiàn)高速信號(hào)產(chǎn)生,又能提高頻譜效率,具有極大的應(yīng)用前景。此外,該脈沖在全光信號(hào)處理,光譜學(xué),光存儲(chǔ)等方面也有著重要的應(yīng)用,所以引起了國(guó)內(nèi)外學(xué)者的廣泛關(guān)注。生成光奈奎斯特脈沖信號(hào)的方法有多種,一些側(cè)重于設(shè)計(jì)結(jié)構(gòu)的簡(jiǎn)單與靈活,一些側(cè)重于生成的脈沖的參數(shù)及質(zhì)量。本文主要研究的是基于傅里葉變換的時(shí)頻二元性的Sinc型光奈奎斯特的直接生成方法。首先使用電光調(diào)制器生成具有窄線寬、振幅相等、相位呈線性變化的均勻光學(xué)頻率梳,也稱為光梳,經(jīng)時(shí)頻變換后,在時(shí)域直接生成序列Sinc型光奈奎斯特脈沖,簡(jiǎn)記為Sinc脈沖。本文首先研究了使用單個(gè)強(qiáng)度調(diào)制器(IM),單個(gè)雙平行馬赫曾德爾調(diào)制器(DPMZM),兩個(gè)級(jí)聯(lián)IM,兩個(gè)級(jí)聯(lián)DPMZM的方案,分別生成了滿足條件的3線、5線、9線、25線不同頻率間隔的光梳,經(jīng)過時(shí)頻變換后生成Sinc型光脈沖。并分析了級(jí)聯(lián)調(diào)制器時(shí),其參數(shù)設(shè)置應(yīng)該滿足的條件。在此基礎(chǔ)上提出了使用DPMZM與IM生成Sin脈沖的方案,其頻域生成的是滿足上述條件的15線光梳,通過改變輸入射頻頻率可以改變生成Sinc脈沖的重復(fù)速率及過零脈寬。并對(duì)這些方案進(jìn)行了公式推導(dǎo)與VPI軟件仿真驗(yàn)證,最后使用Matlab軟件對(duì)比在歸一化的頻率下,不同的光梳線對(duì)應(yīng)的Sinc脈沖。本文還研究了Sagnac環(huán)效應(yīng),利用該效應(yīng),提出了在Sagnac環(huán)中加入IM,形成S-IM方案,生成了5線光梳的Sinc型光奈奎斯特脈沖方案。然后利用級(jí)聯(lián)調(diào)制原理結(jié)合S-IM環(huán)設(shè)計(jì)了級(jí)聯(lián)的IM與S-IM、S-IM與S-IM結(jié)構(gòu)分別生成了15線,25線光梳的Sinc光脈沖,同樣使用VPI與Matlab軟件進(jìn)行了相關(guān)的仿真,該方案突破了IM只能生成3線的光梳的脈沖,更具靈活性;且結(jié)構(gòu)簡(jiǎn)單,易于控制。另外,由于使用的是Sagnac環(huán),沿正反兩個(gè)方向傳播的光在同一個(gè)光纖環(huán)路中傳播,環(huán)境的影響對(duì)系統(tǒng)的穩(wěn)定性影響是有限的,具有一定的研究?jī)r(jià)值和使用價(jià)值。
[Abstract]:Microwave photonics is a new interdisciplinary subject which combines microwave technology and optical technology. It has been developing rapidly in recent decades. Its application involves all aspects of microwave and optics fields. Nyquist pulse is one of the key technologies in microwave photonics signal generation. With the arrival of the "Internet" era, the optical transmission network, which is the basis of the Internet and communication network, is facing more and more pressure. People usually use the method of increasing channel bandwidth, but the frequency resources are limited, so people begin to study how to improve the efficiency of spectrum utilization. In theory, Nyquist signal has the smallest signal bandwidth, but limited by the bandwidth of electronic device and sampling rate, it is difficult to produce high speed signal in electric domain, while all optical Nyquist signal can produce high speed signal. It can also improve the spectral efficiency, and has a great application prospect. In addition, the pulse also has important applications in all optical signal processing, spectroscopy, optical storage and so on, so it has attracted wide attention of scholars at home and abroad. There are many methods to generate the pulse signal of Nyquist, some of which focus on the simplicity and flexibility of the design structure, some on the parameters and quality of the generated pulse. In this paper, the direct generation method of Sinc type light Nyquist based on Fourier transform is studied. At first, the electro-optic modulator is used to generate a uniform optical frequency comb with narrow linewidth, equal amplitude and linear change of phase. After time-frequency conversion, a sequence of Sinc type optical Nyquist pulses is generated directly in time domain, which is abbreviated as a Sinc pulse. In this paper, we first study the scheme of using single intensity modulator (IM), single double parallel Mach Zehnder modulator (DPMZM), two cascaded IM, cascades and two cascaded DPMZM, and generate three lines, five lines, nine lines, 25 lines with different frequency intervals respectively. After time-frequency conversion, Sinc type optical pulses are generated. The condition of parameter setting of cascade modulator is analyzed. On this basis, a scheme of generating Sin pulse using DPMZM and IM is proposed. The frequency domain of the scheme is 15-line comb which meets the above conditions. The repetition rate and zero-crossing pulse width of the generated Sinc pulse can be changed by changing the input RF frequency. The formulas of these schemes are deduced and verified by VPI software simulation. Finally, the Sinc pulse corresponding to different combs is compared with Matlab software at normalized frequency. In this paper, the Sagnac ring effect is also studied. By using this effect, the scheme of adding IM, to Sagnac ring to form S-IM is proposed, and the Sinc type Nyquist pulse scheme with 5 lines combs is generated. Then the concatenated IM and S-IMO S-IM and S-IM structures are designed by using cascade modulation principle and S-IM loop to generate Sinc pulses of 15 lines and 25 lines respectively. The simulation is also carried out by using VPI and Matlab software. This scheme breaks through the pulse of IM which can only generate 3 lines of light comb, and is more flexible, simple in structure and easy to control. In addition, because the Sagnac loop is used, the light propagating in both positive and negative directions propagates in the same fiber loop, so the influence of environment on the stability of the system is limited, which has certain research value and practical value.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN78
本文編號(hào)：2275024
[Abstract]:Microwave photonics is a new interdisciplinary subject which combines microwave technology and optical technology. It has been developing rapidly in recent decades. Its application involves all aspects of microwave and optics fields. Nyquist pulse is one of the key technologies in microwave photonics signal generation. With the arrival of the "Internet" era, the optical transmission network, which is the basis of the Internet and communication network, is facing more and more pressure. People usually use the method of increasing channel bandwidth, but the frequency resources are limited, so people begin to study how to improve the efficiency of spectrum utilization. In theory, Nyquist signal has the smallest signal bandwidth, but limited by the bandwidth of electronic device and sampling rate, it is difficult to produce high speed signal in electric domain, while all optical Nyquist signal can produce high speed signal. It can also improve the spectral efficiency, and has a great application prospect. In addition, the pulse also has important applications in all optical signal processing, spectroscopy, optical storage and so on, so it has attracted wide attention of scholars at home and abroad. There are many methods to generate the pulse signal of Nyquist, some of which focus on the simplicity and flexibility of the design structure, some on the parameters and quality of the generated pulse. In this paper, the direct generation method of Sinc type light Nyquist based on Fourier transform is studied. At first, the electro-optic modulator is used to generate a uniform optical frequency comb with narrow linewidth, equal amplitude and linear change of phase. After time-frequency conversion, a sequence of Sinc type optical Nyquist pulses is generated directly in time domain, which is abbreviated as a Sinc pulse. In this paper, we first study the scheme of using single intensity modulator (IM), single double parallel Mach Zehnder modulator (DPMZM), two cascaded IM, cascades and two cascaded DPMZM, and generate three lines, five lines, nine lines, 25 lines with different frequency intervals respectively. After time-frequency conversion, Sinc type optical pulses are generated. The condition of parameter setting of cascade modulator is analyzed. On this basis, a scheme of generating Sin pulse using DPMZM and IM is proposed. The frequency domain of the scheme is 15-line comb which meets the above conditions. The repetition rate and zero-crossing pulse width of the generated Sinc pulse can be changed by changing the input RF frequency. The formulas of these schemes are deduced and verified by VPI software simulation. Finally, the Sinc pulse corresponding to different combs is compared with Matlab software at normalized frequency. In this paper, the Sagnac ring effect is also studied. By using this effect, the scheme of adding IM, to Sagnac ring to form S-IM is proposed, and the Sinc type Nyquist pulse scheme with 5 lines combs is generated. Then the concatenated IM and S-IMO S-IM and S-IM structures are designed by using cascade modulation principle and S-IM loop to generate Sinc pulses of 15 lines and 25 lines respectively. The simulation is also carried out by using VPI and Matlab software. This scheme breaks through the pulse of IM which can only generate 3 lines of light comb, and is more flexible, simple in structure and easy to control. In addition, because the Sagnac loop is used, the light propagating in both positive and negative directions propagates in the same fiber loop, so the influence of environment on the stability of the system is limited, which has certain research value and practical value.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN78
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