【摘要】：傳輸容量的日益增長推動著光纖傳輸系統(tǒng)的不斷升級。空分復(fù)用技術(shù)由于可以極大地增大光纖傳輸系統(tǒng)的傳輸容量,受到了研究人員的廣泛關(guān)注。應(yīng)用于高速、大容量光纖傳輸系統(tǒng)的多芯光纖是當(dāng)前的研究熱點之一。本文運用耦合模理論和耦合功率理論對兩種空氣孔輔助多芯光纖：環(huán)形分布孔輔助六芯光纖和線形分布孔輔助六芯光纖進(jìn)行了系統(tǒng)的研究。耦合模理論考慮了光纖結(jié)構(gòu)非臨近纖芯的耦合系數(shù)以及纖芯的自耦合系數(shù),分析更為準(zhǔn)確。在孔輔助六芯光纖中,空氣孔半徑,空氣孔與纖芯間距離,纖芯間距離等是影響耦合系數(shù)、串?dāng)_、模場面積的重要參數(shù)。本文系統(tǒng)研究了這些參數(shù)的變化對耦合系數(shù)、串?dāng)_、模場面積的影響。研究表明：通過選取適當(dāng)大的芯間距離、空氣孔半徑,適當(dāng)小的孔芯間距離,兩種光纖均可達(dá)到減小纖芯間互耦合系數(shù)的目的；通過選取適當(dāng)大的纖芯半徑、空氣孔半徑、孔芯間距離,兩種光纖均可以實現(xiàn)低串?dāng)_的目的；選取適當(dāng)大得纖芯半徑,較小的空氣孔半徑、孔芯間距離,可以有效增大兩種光纖的模場面積。特別地,環(huán)形分布孔輔助六芯光纖通過調(diào)整孔輔助參數(shù),在光纖外徑為125μm的前提下,保持芯子之間低串?dāng)_(-30dB以下)的同時,可充分利用光纖的橫截面,使每個芯子的模場面積達(dá)到120-150μm2。本文對低串?dāng)_大模場面積多芯光纖的研制具有重要參考意義,對孔輔助多芯光纖的設(shè)計及制造具有指導(dǎo)意義。
[Abstract]:The increasing transmission capacity promotes the upgrading of optical fiber transmission system. Space Division Multiplexing (SDDM) technology has attracted much attention because it can greatly increase the transmission capacity of optical fiber transmission systems. Multi-core fiber used in high-speed and large-capacity optical fiber transmission system is one of the research hotspots. In this paper, two kinds of air-assisted multi-core fiber, annular distributed hole assisted six-core fiber and linear distributed hole assisted six-core fiber, are systematically studied by using coupling mode theory and coupling power theory. The coupled mode theory takes into account the coupling coefficient of the non-adjacent fiber core and the self-coupling coefficient of the fiber core, and the analysis is more accurate. The air hole radius, the distance between air hole and core, and the distance between core and core are important parameters affecting coupling coefficient, crosstalk and mode field area. In this paper, the effects of these parameters on the coupling coefficient, crosstalk and mode field area are systematically studied. The results show that the two kinds of optical fibers can reduce the mutual coupling coefficient of the core by selecting appropriate large core distance, air hole radius and appropriate small hole core distance, and by selecting appropriate large core radius, the air hole radius can be reduced. The two kinds of optical fibers can achieve the purpose of low crosstalk in the distance between holes and cores, and the mode field area of the two kinds of optical fibers can be effectively increased by selecting a suitable large core radius, a smaller air hole radius and a distance between the holes and cores. In particular, the annular distributed hole assisted six-core fiber can make full use of the cross section of the fiber by adjusting the auxiliary parameters of the hole and keeping the low crosstalk between the cores (-30dB or less) while the external diameter of the fiber is 125 渭 m. The mold field area of each core reaches 120-150 渭 m ~ 2. This paper has important reference significance for the development of low crosstalk large mode area multi-core fiber, and has guiding significance for the design and manufacture of hole-assisted multi-core fiber.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN253

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