本文關(guān)鍵詞： 多芯光纖 串?dāng)_特性 溝槽結(jié)構(gòu)光纖 耦合模理論 功率耦合理論　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著信息技術(shù)的發(fā)展,通信容量與日俱增。光纖通信由于自身帶寬大、速率高、損耗小等優(yōu)勢(shì),成為了未來(lái)通信發(fā)展的重中之重。要構(gòu)建實(shí)用化的高速、大容量全光通信網(wǎng),增大光纖有效模場(chǎng)面積、減小光纖色散、擴(kuò)大光纖的傳輸容量,是實(shí)現(xiàn)高功率大容量傳輸?shù)谋貍錀l件。為提升光纖通信容量,空分復(fù)用技術(shù)(SDM)被大量采用。SDM技術(shù)采用多芯光纖,使光在一根光纖的多個(gè)芯子傳輸,極大地提高了光纖的通信容量,推動(dòng)著光纖通信產(chǎn)業(yè)的發(fā)展。多芯光纖作為光纖SDM系統(tǒng)的基礎(chǔ)器件,其優(yōu)劣關(guān)乎整體光纖通信系統(tǒng)的性能。因此,本文對(duì)多芯光纖進(jìn)行了詳細(xì)的研究,主要工作如下:1.利用耦合模理論,對(duì)7芯光纖的耦合方程進(jìn)行了推導(dǎo),并得出七芯光纖的耦合系數(shù)公式。另外,對(duì)光纖在長(zhǎng)距離傳輸時(shí)的功率耦合理論進(jìn)行了完整的分析。根據(jù)功率耦合理論,研究了當(dāng)光從不同位置的芯子入射時(shí),各芯子的功率分布情況。2.對(duì)多芯光纖的色散、有效模場(chǎng)面積進(jìn)行了研究。重點(diǎn)分析了溝槽相對(duì)寬度、溝槽相對(duì)折射率差、溝槽相對(duì)位置對(duì)光纖的色散及有效模場(chǎng)面積的影響。得出了三個(gè)參數(shù)在一定范圍內(nèi)能使有效面積保持在較高的范圍內(nèi)的結(jié)論,計(jì)算結(jié)果表明,當(dāng)光纖纖芯半徑5μm,溝槽相對(duì)位置小于0.5時(shí),光纖的色散可約為-2 ps/(km.nm),纖芯的模場(chǎng)面積約為145μm2。3.研究了多芯光纖的芯間串?dāng)_特性,得出了溝槽折射率差相對(duì)于溝槽相對(duì)位置和溝槽相對(duì)寬度明顯有更好的對(duì)串?dāng)_特性調(diào)節(jié)的作用的結(jié)論。分析結(jié)果表明,當(dāng)光纖溝槽相對(duì)折射率差為0.0025,包層厚度為3μm,溝槽相對(duì)寬度大于1.2時(shí),光纖的芯間串?dāng)_能達(dá)到-50dB。
[Abstract]:With the development of information technology, the communication capacity is increasing day by day. Due to the advantages of large bandwidth, high speed, low loss and so on, optical fiber communication has become the most important part of the future communication development. Increasing the effective mode field area of optical fiber, reducing the dispersion of optical fiber and expanding the transmission capacity of optical fiber are the necessary conditions to realize high power and large capacity transmission. In order to enhance the capacity of optical fiber communication, SDM (Space Division Multiplexing) technology is widely used in the use of multi-core fiber. The transmission of light through multiple cores of a single optical fiber greatly improves the communication capacity of the optical fiber and promotes the development of the optical fiber communication industry. As the basic device of the optical fiber SDM system, the multi-core optical fiber is used as the basic device of the optical fiber SDM system. The merits and demerits are related to the performance of the whole optical fiber communication system. Therefore, the multi-core fiber is studied in detail in this paper, the main work is as follows: 1.Using the coupling mode theory, the coupling equation of the 7-core fiber is deduced. The coupling coefficient formula of the seven core fiber is obtained. In addition, the power coupling theory of the fiber during long distance transmission is analyzed. According to the power coupling theory, the incident of the core from different positions is studied. The dispersion and effective mode field area of multi-core fiber are studied. The relative width of grooves and the relative refractive index difference of grooves are analyzed. The influence of grooves relative position on the dispersion and effective mode field area of fiber is obtained. The conclusion is drawn that the effective area can be kept in a higher range by three parameters in a certain range. The calculation results show that, When the core radius of the fiber is 5 渭 m and the relative position of the groove is less than 0.5, the dispersion of the fiber can be about -2 ps.km.nmnm.The mode field area of the core is about 145 渭 m2.3.The cross-core crosstalk characteristics of the multi-core fiber are studied. It is concluded that the refractive index difference of the grooves has a better effect on the crosstalk characteristics than the relative position and width of the grooves. The analysis results show that the refractive index difference of the grooves is better than the relative position and width of the grooves. When the relative refractive index difference of the fiber grooves is 0.0025, the cladding thickness is 3 渭 m and the relative width of the grooves is larger than 1.2, the intercore crosstalk energy of the fiber can reach -50 dB.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN253

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