本文選題：模分復(fù)用 + 少模光子晶體光纖�。� 參考：《南京郵電大學(xué)》2017年碩士論文

【摘要】：近年來,波分復(fù)用系統(tǒng)因單模光纖的非線性容忍度小,傳輸容量越來越接近香農(nóng)極限。為了進(jìn)一步擴(kuò)充光纖通信的容量,以模式為自由度的模分復(fù)用技術(shù)應(yīng)運(yùn)而生。模分復(fù)用技術(shù)利用少模光纖中的高階模式作為新的獨(dú)立信道,成倍地提高了光纖通信系統(tǒng)的容量和傳輸效率。同時,光纖模式轉(zhuǎn)換是利用模式耦合原理實(shí)現(xiàn)基模和高階模的能量交換,是構(gòu)建模分復(fù)用系統(tǒng)的關(guān)鍵技術(shù)之一,也是近年來的研究熱點(diǎn)。光子晶體光纖因其靈活的結(jié)構(gòu)設(shè)計性和和特殊的光學(xué)特性,廣泛應(yīng)用在光纖傳輸及光學(xué)器件的設(shè)計等領(lǐng)域。本文從實(shí)用化角度出發(fā),設(shè)計了基于光子晶體光纖的少模傳輸光纖和模式轉(zhuǎn)換器。利用麥克斯韋方程分析少模光子晶體光纖中的模式特性,利用波導(dǎo)耦合理論分析了模式轉(zhuǎn)換的原理,為少模傳輸和模式轉(zhuǎn)換器的實(shí)現(xiàn)提供了理論依據(jù),論文的具體工作如下:本文首先針對長距離大容量光纖傳輸系統(tǒng),從降低制作難度和提高實(shí)用性出發(fā),設(shè)計了一種單芯的雙模PCF。在1.46~1.56μm波長段內(nèi),該光纖可實(shí)現(xiàn)穩(wěn)定的基模和二階模的雙模傳輸,模式間有效折射率差大于0.001,避免了模間串?dāng)_。通過優(yōu)化結(jié)構(gòu)得到Λ=10μm,d_1/Λ=0.55、d_2/Λ=0.65、d_3/Λ=0.75時,基模和二階模在C波段上的相對色散系數(shù)分別為2.138ps/(nm·km)、1.154ps/(nm·km),色散斜率介于-0.012~0.322 ps/(nm~2·km)之間滿足色散平坦要求;1.55μm處,模場面積分別為106.72μm~2和155.34μm~2;傳輸模式的衰減系數(shù)小于1.41×10~(-5)d B/m,總損耗小于10~(-4)量級。雙模PCF的傳輸特性符合G.652和G.655光纖標(biāo)準(zhǔn),且有效抑制了非線性效應(yīng),參考現(xiàn)有光纖成熟的制備技術(shù),具有廣闊的實(shí)用化前景。其次,針對模分復(fù)用技術(shù)中的模式轉(zhuǎn)換問題,提出了一種基于PCF的模式轉(zhuǎn)換器,實(shí)現(xiàn)了LP_(01)和LP_(11)模的低損耗轉(zhuǎn)換。在1.50~1.56μm范圍內(nèi),耦合效率可達(dá)92.93%,傳輸損耗小于1d B,并具有寬帶特性。文中給出基于少模光子晶體光纖的模分復(fù)用系統(tǒng)結(jié)構(gòu)模型,對相關(guān)技術(shù)問題做了論述。本文的研究均基于光子晶體光纖的特殊結(jié)構(gòu)及特性,有利于新一代光纖通信技術(shù)的進(jìn)一步研究和應(yīng)用。
[Abstract]:In recent years, because of the small nonlinear tolerance of single-mode optical fiber, the transmission capacity of WDM system is closer to Shannon limit. In order to further expand the capacity of optical fiber communication, modular division multiplexing (DM) technology with Mode-Degree-of-Freedom (DOF) emerged as the times require. Mode division multiplexing (MWDM) uses high-order modes in low-mode optical fiber as a new independent channel, which can greatly improve the capacity and transmission efficiency of optical fiber communication system. At the same time, the mode conversion of fiber is one of the key technologies to construct the modular division multiplexing system, which realizes the energy exchange between the base mode and the high order mode by using the mode coupling principle, and is also the research hotspot in recent years. Photonic crystal fiber (PCF) is widely used in optical fiber transmission and optical device design due to its flexible structural design and special optical properties. In this paper, we design a low mode transmission fiber and mode converter based on photonic crystal fiber. Using Maxwell equation to analyze the mode characteristics in the photonic crystal fiber, and the waveguide coupling theory is used to analyze the principle of mode conversion, which provides a theoretical basis for the realization of the mode converter and the transmission of the less mode. The main work of this paper is as follows: firstly, a single-core dual-mode PCF is designed in order to reduce the fabrication difficulty and improve the practicability of the long distance and large capacity optical fiber transmission system. In the wavelength range of 1.46 渭 m and 1.56 渭 m, the fiber can achieve stable two-mode transmission of base mode and second-order mode. The effective refractive index difference between modes is greater than 0.001, thus avoiding crosstalk between modes. By optimizing the structure, the relative dispersion coefficients of the base mode and the second-order mode in C band are found to be 1.154 ps-1 / 0.55 ps/(nm~2 / 渭 m, respectively, and the dispersion slope between -0.0120.322 ps/(nm~2 km and 1.55 渭 m for the base mode and the second-order mode at C band, respectively, and the dispersion slope is between -0.0120.322 ps/(nm~2 km. the relative dispersion coefficients of the base mode and the second-order mode are 1.55 渭 m and 1.55 渭 m, respectively, and the dispersion slope is -0.0120.322 ps/(nm~2 / km, and the relative dispersion coefficients of the base mode and the second-order mode in C band are 1.154ps-1. The mode field area is 106.72 渭 m ~ (2) and 155.34 渭 m ~ (-2), respectively. The attenuation coefficient of transmission mode is less than 1.41 脳 10 ~ (-5) dB / m, and the total loss is less than 10 ~ (10) ~ (-4). The transmission characteristics of dual-mode PCF accord with G. 652 and G.655 fiber standards, and effectively suppress the nonlinear effect. Referring to the existing mature fabrication technology of fiber, it has a broad practical prospect. Secondly, a mode converter based on PCF is proposed to solve the mode conversion problem in mode division multiplexing technology. In the range of 1.50 ~ 1.56 渭 m, the coupling efficiency can reach 92.93, the transmission loss is less than 1dB, and it has broadband characteristics. In this paper, the structure model of module division multiplexing system based on low mode photonic crystal fiber is presented, and the related technical problems are discussed. The research in this paper is based on the special structure and characteristics of photonic crystal fiber, which is beneficial to the further research and application of the new generation optical fiber communication technology.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN253;TN929.11

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