本文選題：光Nyquist脈沖 + 光學頻率梳�。� 參考：《北京交通大學》2017年碩士論文

【摘要】：隨著手機、個人電腦的普及以及各種寬帶視頻、多媒體業(yè)務(wù)的出現(xiàn),通信系統(tǒng)的容量受到越來越大的挑戰(zhàn),超太比特的單信道傳輸速率的光通信網(wǎng)絡(luò)成為研究的重點。基于光Nyquist脈沖的波分復(fù)用及正交時分復(fù)用技術(shù)是實現(xiàn)超級信道及提高頻譜效率的最具前景的技術(shù),產(chǎn)生理想的光Nyquist脈沖具有重要的現(xiàn)實意義。同時,光學頻率梳實現(xiàn)了人類對光學頻率的精密測量,也被廣泛應(yīng)用于微波光子學信號處理、光纖通信復(fù)用系統(tǒng)中,通過平坦光頻梳直接合成光Nyquist脈沖的方法成為相關(guān)領(lǐng)域的研究熱點。本文的研究內(nèi)容主要針對平坦光學頻率梳和光Nyquist脈沖兩部分展開,完成的主要工作如下:1.對通過頻域平坦光頻梳來產(chǎn)生時域的光Nyquist脈沖進行了詳細的理論證明,并且對基于射頻單頻驅(qū)動雙驅(qū)動馬赫增德爾調(diào)制器(DD-MZM)、射頻倍頻驅(qū)動DD-MZM和射頻單頻驅(qū)動雙平行馬赫增德爾調(diào)制器(DPMZM)、射頻倍頻驅(qū)動DPMZM產(chǎn)生光頻梳進行了理論推導,仿真產(chǎn)生了具有多種梳線數(shù)目的平坦光頻梳。2.提出了基于射頻倍頻信號驅(qū)動單個DPMZM產(chǎn)生光Nyquist脈沖的新結(jié)構(gòu),在理論分析的基礎(chǔ)上仿真產(chǎn)生了相位鎖定的具有5條梳線的光頻梳,其平坦度高達0 dB,邊模抑制比為41 dB,在時域?qū)?yīng)理想的sinc型Nyquist脈沖。通過調(diào)整射頻信號的頻率,在0.01 V的驅(qū)動電壓下產(chǎn)生了滾降系數(shù)均為0的周期為100 ps、50 ps及25 ps的光Nyquist脈沖序列,并且在較低的射頻驅(qū)動電壓下產(chǎn)生了具有9,5,4,3,2條梳線的光頻梳,其中具有5,3,2條梳線的光頻梳的平坦度均高達0dB,邊模抑制比均高于34.5 dB。與前人的工作相比,本文基于射頻倍頻驅(qū)動DPMZM產(chǎn)生的光頻梳具有更高的質(zhì)量。3.通過探究基于單個EAM級聯(lián)PM級聯(lián)PM和單個EAM級聯(lián)PM級聯(lián)MZM中EAM對光頻梳平坦度的影響,提出了兩種產(chǎn)生平坦光頻梳的新方法,即基于兩個EAM級聯(lián)PM級聯(lián)PM和兩個EAM級聯(lián)PM級聯(lián)MZM產(chǎn)生平坦光頻梳,并且基于兩個EAM級聯(lián)PM級聯(lián)PM產(chǎn)生了平坦度在2 dB范圍內(nèi)的具有37條梳線的光頻梳,且中部平坦度在0.4 dB范圍內(nèi)的梳線有31條,與單個EAM級聯(lián)PM級聯(lián)PM相比,光頻梳的平坦度提高了 6.6dB,中部平坦光頻梳的梳線條數(shù)增加了 2條;基于兩個EAM級聯(lián)PM級聯(lián)MZM產(chǎn)生了平坦度在0.7 dB范圍內(nèi)的具有41條梳線的光頻梳,與單個EAM級聯(lián)PM級聯(lián)MZM相比,光頻梳的平坦度提高了 0.7 dB,梳線條數(shù)增加了2條。
[Abstract]:With the popularity of mobile phones, personal computers and the emergence of broadband video and multimedia services, the capacity of communication systems is increasingly challenged.Wavelength division multiplexing (WDM) and orthogonal time division multiplexing (OTDM) based on optical Nyquist pulses are the most promising techniques to realize superchannel and improve spectral efficiency. It is of great practical significance to produce ideal optical Nyquist pulses.At the same time, optical frequency comb has realized the precise measurement of optical frequency, and has been widely used in microwave signal processing and optical fiber communication multiplexing system.The method of directly synthesizing optical Nyquist pulse by flat optical frequency comb has become a research hotspot in related fields.In this paper, we mainly focus on the flat optical frequency comb and the optical Nyquist pulse. The main work accomplished is as follows: 1.The generation of optical Nyquist pulse in time domain by flattened optical frequency comb in frequency domain is proved in detail.The theoretical derivation of optical comb is also given based on the single-frequency driving DD-MZM, the dual-parallel DD-MZM driven by the single-frequency RF and the DPMZM driven by the radio frequency doubling, respectively, and the optical comb generated by the DPMZM driven by the RF frequency doubling, which is based on the single-frequency driving and the dual-drive Machzendal modulator, and the dual-parallel DPMZM driven by the RF single frequency is used to generate the optical comb.A flattened optical frequency comb. 2 with a variety of combs is generated by simulation.A new structure of optical Nyquist pulse generated by a single DPMZM driven by RF frequency doubling signal is proposed. Based on the theoretical analysis, a phase locked optical frequency comb with five comb lines is simulated.The flatness is as high as 0 dB and the edge-mode rejection ratio is 41 dB, which corresponds to the ideal sinc type Nyquist pulse in time domain.The flattening degree of the optical comb with 5 ~ 3 ~ 3 carding lines is as high as 0 dB, and the edge-mode rejection ratio is higher than 34.5 dB.Compared with the previous work, the optical comb based on RF frequency doubling driven DPMZM has higher quality. 3.By exploring the influence of EAM on the flatness of optical comb in PM cascade PM cascade based on single EAM cascade and PM cascade MZM in single EAM cascade, two new methods to produce flat optical comb are proposed.That is, based on two EAM cascaded PM cascaded PM cascades and two EAM cascaded PM cascaded MZM to produce flat optical comb, and based on two EAM cascaded PM cascaded PM cascaded PM to produce optical comb with 37 comb lines in the range of 2 dB flatness.There are 31 comb lines with middle flatness in the range of 0.4 dB. Compared with single EAM cascaded PM cascaded PM, the flatness of optical comb is increased by 6.6 dB, and the number of comb lines of middle flat optical comb is increased by 2.Based on two EAM cascaded PM cascaded MZM, 41 comb lines with 41 comb lines are generated in the flatness range of 0.7 dB. Compared with single EAM cascaded PM cascade MZM, the optical frequency comb flatness is increased by 0.7 dB and the number of comb lines is increased by 2.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN761;TN929.1

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