本文選題：奇點(diǎn)光束 + 軌道角動(dòng)量光束　； 參考：《深圳大學(xué)》2017年碩士論文

【摘要】：目前信息社會(huì)已全面進(jìn)入互聯(lián)網(wǎng)時(shí)代,互聯(lián)網(wǎng)的飛速發(fā)展對(duì)光纖通信帶寬需求不斷增長(zhǎng)。一方面,現(xiàn)有光纖通信的頻譜帶寬資源已接近飽和。另一方面,隨著各種復(fù)用技術(shù)不斷突破,光纖通信系統(tǒng)容量劇增,但現(xiàn)有通信單模光纖的單信道通信容量已接近香農(nóng)極限。所以為滿足今后光纖通信的帶寬需求,亟需尋找新的光束復(fù)用技術(shù)和大容量復(fù)用光纖。奇點(diǎn)光束是指基于位相奇點(diǎn)的軌道角動(dòng)量(OAM)光束和偏振奇點(diǎn)的柱矢量(CVB)光束,它們?yōu)楣馐膹?fù)用提供了一種全新的自由度。但奇點(diǎn)光束在自由空間中傳輸容易受到大氣擾動(dòng)和熱湍流的影響,導(dǎo)致傳輸?shù)钠纥c(diǎn)光束模式純度較低而發(fā)生模式串?dāng)_。由奇點(diǎn)光束攜帶通信信號(hào),在自由空間光通信系統(tǒng)中可能發(fā)生信號(hào)的畸變,最終會(huì)導(dǎo)致在解調(diào)端信號(hào)無(wú)法解調(diào)。而光纖則為奇點(diǎn)光束的穩(wěn)定傳輸提供了條件。本論文提出將OAM和CVB光束的復(fù)用和解復(fù)用技術(shù)應(yīng)用于光纖通信中,并對(duì)OAM和CVB光束在光纖中的傳輸進(jìn)行基礎(chǔ)與應(yīng)用研究,為現(xiàn)代光纖通信的發(fā)展提供一種全新技術(shù)手段和思路。本論文的主要研究?jī)?nèi)容和成果如下:(1)演示一種柚子型微結(jié)構(gòu)光纖(MOF)中OAM光束的傳輸。首先使用有限元軟件計(jì)算柚子型微結(jié)構(gòu)光纖所支持的各種本征矢量模式,運(yùn)用模式疊加理論計(jì)算這些光纖本征矢量模式所能形成的OAM模式,各個(gè)本征矢量模式之間的有效折射率差達(dá)到10~(-2)以上,理論上可以有效減弱模式間的相互耦合,提高OAM模式在光纖中的傳輸性能。其次在實(shí)驗(yàn)中演示這種MOF傳輸OAM模式,并利用特殊設(shè)計(jì)的光學(xué)旋渦達(dá)曼光柵對(duì)經(jīng)過(guò)MOF傳輸后的OAM模式進(jìn)行驗(yàn)證。(2)演示一種少模光纖(FMF)中CVB光束的傳輸與信號(hào)通信。首先使用有限元軟件計(jì)算FMF所支持的本征矢量模式,分析FMF中各個(gè)本征矢量模式在不同波長(zhǎng)下的有效折射率分布,對(duì)比它們之間的有效折射率差。其次在光學(xué)實(shí)驗(yàn)中演示CVB光束在FMF中的傳輸,測(cè)試不同CVB光束經(jīng)過(guò)FMF傳輸后解調(diào)模式的純度。并在后續(xù)通信實(shí)驗(yàn)中,利用兩路同軸的高階CVB光束,每路攜帶10Gbit/s的二進(jìn)制啟閉鍵控(OOK)信號(hào),進(jìn)行5km的光纖通信,測(cè)試通信系統(tǒng)的誤碼率,再結(jié)合同階CVB光束的偏振復(fù)用,實(shí)現(xiàn)四路同軸CVB光纖通信,測(cè)試通信系統(tǒng)的誤碼率。系統(tǒng)的誤碼率滿足帶前向糾錯(cuò)功能(FEC)信道編碼的最低閾值要求,符合光通信系統(tǒng)標(biāo)準(zhǔn),實(shí)現(xiàn)了CVB光束的光纖傳輸、復(fù)用和通信�？傊�,本論文對(duì)OAM和CVB光束在光纖通信中進(jìn)行基礎(chǔ)與應(yīng)用研究。將奇點(diǎn)光束的復(fù)用和解復(fù)用技術(shù)運(yùn)用在光纖中,進(jìn)行信息傳輸與通信,可以進(jìn)一步提升光纖通信系統(tǒng)的容量,為今后數(shù)據(jù)中心中的光通信技術(shù)發(fā)展奠定基礎(chǔ)。
[Abstract]:At present, the information society has entered the Internet era, and the rapid development of the Internet is increasing the demand for optical fiber communication bandwidth. On the one hand, the spectrum bandwidth of optical fiber communication is nearly saturated. On the other hand, with the continuous breakthrough of various multiplexing technologies, the capacity of optical fiber communication system increases dramatically, but the single-channel communication capacity of the existing single-mode optical fiber is close to the Shannon limit. Therefore, it is urgent to find new beam multiplexing technology and large capacity multiplexed fiber to meet the bandwidth requirement of optical fiber communication in the future. The singularity beam refers to the orbit angular momentum (OAM) beam based on the phase singularity and the polarization singular point cylindrical vector CVB beam. They provide a new degree of freedom for the beam multiplexing. However, the propagation of singularity beam in free space is easily affected by atmospheric disturbance and thermal turbulence, which leads to mode crosstalk due to the low purity of the propagating singularity beam. If the singularity beam carries the communication signal, the signal distortion may occur in the free space optical communication system, which will eventually lead to the signal being unable to demodulate at the demodulation end. The optical fiber provides the condition for the stable propagation of the singularity beam. In this paper, the multiplexing and demultiplexing technology of OAM and CVB beams is applied to optical fiber communication, and the basic and applied research on the propagation of OAM and CVB beams in optical fiber is carried out, which provides a new technical means and train of thought for the development of modern optical fiber communication. The main contents and results of this thesis are as follows: 1) demonstrating the propagation of OAM beams in a grapefruit microstructured optical fiber (MOF). Firstly, various intrinsic vector modes supported by grapefruit microstructured optical fibers are calculated by using finite element software, and the OAM modes formed by these optical fiber eigenvector modes are calculated by using the mode superposition theory. The effective refractive index difference between each intrinsic vector mode is over 10 ~ 2), which can effectively weaken the coupling between the modes and improve the transmission performance of the OAM mode in optical fiber. Secondly, the OAM mode of MOF transmission is demonstrated in the experiment, and the special designed optical vortex Darman grating is used to verify the OAM mode after MOF propagation. 2) to demonstrate the transmission and signal communication of the CVB beam in a small mode optical fiber (FMF). Firstly, the eigenvector modes supported by FMF are calculated by finite element software. The effective refractive index distributions of each eigenvector mode in FMF at different wavelengths are analyzed, and the difference of effective refractive index between them is compared. Secondly, the propagation of CVB beams in FMF is demonstrated in optical experiments, and the purity of demodulation modes of different CVB beams after FMF propagation is tested. In the subsequent communication experiment, using two high-order CVB beams of coaxial, each channel carries the 10Gbit/s binary on-off keying OOK signal, carries out the optical fiber communication of 5km, tests the error rate of the communication system, and combines the polarization multiplexing of the same order CVB beam. The four-channel coaxial CVB fiber communication is realized and the bit error rate of the communication system is tested. The error rate of the system meets the minimum threshold requirement of channel coding with forward error correction function and conforms to the standard of optical communication system. The optical fiber transmission multiplexing and communication of CVB beams are realized. In conclusion, the basic and application of OAM and CVB beams in optical fiber communication are studied in this thesis. The application of singularity beam multiplexing and demultiplexing technology in optical fiber for information transmission and communication can further enhance the capacity of optical fiber communication system and lay the foundation for the development of optical communication technology in data center in the future.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.11

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