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  本文關(guān)鍵詞：彎曲不敏感少模光纖研究　出處：《北京交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 少模光纖 微擾法 彎曲損耗 彎曲不敏感光纖 模場直徑

【摘要】：隨著光纖傳輸系統(tǒng)容量的迅速增加,模分復(fù)用技術(shù)成為當(dāng)前提升光纖通信容量的研究熱點(diǎn)之一。基于模分復(fù)用的少模光纖得到越來越多的關(guān)注,然而,當(dāng)前對少模光纖中各階模式的彎曲損耗及光纖彎曲性能優(yōu)化問題的研究尚處空白。本文對少模光纖中高階模的彎曲損耗進(jìn)行了系統(tǒng)的理論研究。利用微擾法推導(dǎo)得到了各階模式彎曲損耗的理論公式,可適用于研究多種光纖結(jié)構(gòu)的高階模式的彎曲損耗。本文研究內(nèi)容主要涉及階躍型和拋物線型下陷層輔助彎曲不敏感光纖,系統(tǒng)研究了LP01、LP11、LP21以及LP02四個標(biāo)量模的彎曲損耗與模場直徑。研究結(jié)果表明：光纖的芯層與下陷層之間的距離、下陷層的寬度、下陷層與包層的折射率差、涂覆層折射率、歸一化頻率以及纖芯半徑(數(shù)值孔徑)等結(jié)構(gòu)參數(shù)對各階模的彎曲損耗和模場直徑均有影響。在相同曲率半徑下,彎曲損耗隨著模式階數(shù)的增高而增大；芯層與下陷層之間的距離存在彎曲損耗優(yōu)化點(diǎn),較基模而言,高階模式的彎曲損耗優(yōu)化點(diǎn)要更接近芯層；對高階模而言,涂覆層導(dǎo)致的彎曲損耗曲線周期性震蕩的振幅和頻率較基模要大；對于高階模式模場直徑的研究表明,下陷層的出現(xiàn)會減小各階模式的模場直徑,且模式階數(shù)越高減小的幅度也越大；芯層與下陷層之間的距離的增加則能夠增大各階模式模場直徑；在傳輸模式數(shù)量相同時,拋物線型光纖的彎曲性能要優(yōu)于階躍型光纖。本文的研究結(jié)果對于設(shè)計(jì)和制造彎曲不敏感少模光纖具有指導(dǎo)意義。
[Abstract]:With the rapid increase of optical fiber transmission system capacity, module division multiplexing technology has become one of the research hotspots in improving the capacity of optical fiber communication. Less mode optical fiber based on mode division multiplexing has received more and more attention, however. The research on bending loss of each order mode and optimization of bending performance of optical fiber is still blank. In this paper, the bending loss of high-order mode in low-mode fiber is systematically studied. The perturbation method is used to deduce the bending loss of high-order mode. The theoretical formula of bending loss of each order mode is obtained. It can be used to study the bending loss of high-order modes in various optical fiber structures. This paper mainly deals with step and parabola subsidence layer aided bending insensitive fibers, and systematically studies LP01 / LP11. The bending loss and mode field diameter of the four scalar modes of LP21 and LP02. The results show that the distance between the core layer and the subsidence layer, the width of the trapping layer, and the refractive index difference between the trapping layer and the cladding layer. The refractive index of coating layer, normalized frequency and core radius (numerical aperture) have effects on bending loss and mode field diameter of each order mode. The bending loss increases with the increase of mode order. The distance between the core layer and the subsidence layer has a bending loss optimization point, which is closer to the core layer than the base mode. For high-order modes, the amplitude and frequency of periodic oscillations caused by the coating layer are larger than those of the base mode. The study of the mode field diameters of higher order modes shows that the occurrence of the subsidence layer will reduce the mode field diameter of each order mode, and the higher the mode order is, the larger the amplitude will be. The increase of the distance between the core layer and the subsidence layer can increase the mode field diameter of each order. When the number of transmission modes is the same, the bending performance of parabolic fiber is better than that of step 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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本文編號：1383049