空气孔辅助多芯光纤的研究
发布时间：2018-10-09 09:36
【摘要】：传输容量的日益增长推动着光纤传输系统的不断升级。空分复用技术由于可以极大地增大光纤传输系统的传输容量,受到了研究人员的广泛关注。应用于高速、大容量光纤传输系统的多芯光纤是当前的研究热点之一。本文运用耦合模理论和耦合功率理论对两种空气孔辅助多芯光纤：环形分布孔辅助六芯光纤和线形分布孔辅助六芯光纤进行了系统的研究。耦合模理论考虑了光纤结构非临近纤芯的耦合系数以及纤芯的自耦合系数,分析更为准确。在孔辅助六芯光纤中,空气孔半径,空气孔与纤芯间距离,纤芯间距离等是影响耦合系数、串扰、模场面积的重要参数。本文系统研究了这些参数的变化对耦合系数、串扰、模场面积的影响。研究表明：通过选取适当大的芯间距离、空气孔半径,适当小的孔芯间距离,两种光纤均可达到减小纤芯间互耦合系数的目的；通过选取适当大的纤芯半径、空气孔半径、孔芯间距离,两种光纤均可以实现低串扰的目的；选取适当大得纤芯半径,较小的空气孔半径、孔芯间距离,可以有效增大两种光纤的模场面积。特别地,环形分布孔辅助六芯光纤通过调整孔辅助参数,在光纤外径为125μm的前提下,保持芯子之间低串扰(-30dB以下)的同时,可充分利用光纤的横截面,使每个芯子的模场面积达到120-150μm2。本文对低串扰大模场面积多芯光纤的研制具有重要参考意义,对孔辅助多芯光纤的设计及制造具有指导意义。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
本文编号：2258865
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
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