基于双包层双芯光纤的一阶光时域微分器研究

发布时间：2018-03-01 17:55

本文关键词： 信号处理光纤器件双包层双芯光纤光时域微分器　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：光信号处理技术可以在光域直接对信号进行快速处理,是克服"电子瓶颈"实现全光网络的重要技术之一,应用领域十分广泛。光时域微分器可以在光域直接对光信号进行时域微分运算,是光信号处理技术中一种十分重要的光器件。本文提出了一种双包层双芯光纤光波导结构,研究了该波导的模场矩阵、特征方程、传输特性以及色散特性;基于双包层双芯光纤光波导结构,提出了一种实现一阶光时域微分器的方案,并分析了该微分器的3dB带宽、能量效率和误差因子等特性。本文主要完成的研究工作如下:(1)对目前全光网络中光信号处理技术的现状进行了深入研究,并分析了己有光时域微分器实现方案的优缺点。(2)提出了一种双包层双芯光纤光波导结构。通过对处于不同耦合状态下双芯光纤的传输特性分析,得出了在完全耦合状态下,双包层双芯光纤光波导结构的模场矩阵和特征方程。重点研究了双包层双芯光纤波导结构的传输特性和色散特性,结果表明:该光波导的传输常数与入射波长、内包层半径和折射率差成反比关系、与纤芯半径成正比关系;双包层双芯光纤相比于普通双芯光纤,具有更大的传输常数;双包层双芯光纤光波导的色散随着入射波长的增加而线性增加。本文得出的上述结论,为提出基于双包层双芯光纤的一阶光时域微分器提供了重要的理论依据。(3)提出了一种基于双包层双芯光纤光波导实现的一阶光时域微分器方案,研究分析了该微分器的3dB带宽、误差因子和能量效率等特性,并验证了对高斯脉冲信号的一阶微分效果。结果表明,该微分器的中心频率与光纤长度成反比关系,通过调节双包层双芯光纤的长度能够实现微分器中心频率的调谐;微分器3dB带宽与双包层双芯光纤内包层半径、折射率差成反比关系,且3dB带宽最大可达到1.775THz,高于基于单包层双芯光纤一阶光时域微分器的最大3dB带宽;当输入高斯脉冲的衰减因子为0.5ps时,误差因子最小可达到0.00997。
[Abstract]:The optical signal processing technology can process the signal directly in the optical domain, which is one of the important technologies to overcome the "electronic bottleneck" to realize the all-optical network. The optical time domain differentiator is a very important optical device in the optical signal processing technology, which can directly perform the time domain differential operation of the optical signal in the optical domain. In this paper, a double-clad double-core optical waveguide structure is proposed. The mode field matrix, characteristic equation, transmission characteristics and dispersion characteristics of the waveguide are studied. Based on the double-clad double-core fiber waveguide structure, a scheme to realize the first order optical time-domain differentiator is proposed, and the 3dB bandwidth of the differentiator is analyzed. Energy efficiency and error factor. The main research work in this paper is as follows: 1) the current situation of optical signal processing technology in all-optical network is deeply studied. The advantages and disadvantages of the existing optical time domain differentiator (OTD) are analyzed. (2) A double-clad double-core fiber waveguide structure is proposed. By analyzing the transmission characteristics of the dual-core fiber in different coupling states, it is concluded that the optical waveguide structure is fully coupled. The mode field matrix and characteristic equation of double-clad double-core fiber waveguide structure are studied. The transmission and dispersion characteristics of double-clad double-core fiber waveguide structure are studied. The results show that the transmission constant and incident wavelength of the double-clad double-core fiber waveguide are obtained. The inner cladding radius is inversely proportional to the refractive index difference and is proportional to the core radius. The dispersion of double-clad double-core fiber waveguide increases linearly with the increase of incident wavelength. In order to provide an important theoretical basis for the first order optical time domain differentiator based on double cladding double core fiber, a first order optical time domain differentiator scheme based on double clad double core fiber waveguide is proposed. The 3dB bandwidth of the differentiator is studied and analyzed. The error factor and energy efficiency are used to verify the first-order differential effect of Gao Si pulse signal. The results show that the central frequency of the differentiator is inversely proportional to the fiber length. The center frequency of differentiator can be tuned by adjusting the length of double-core fiber, and the 3dB bandwidth of differentiator is inversely proportional to the inner cladding radius and refractive index difference of double-clad double-core fiber. The maximum bandwidth of 3 dB can reach 1.775THz, which is higher than that based on single-cladding double-core fiber first order optical time domain differentiator, and the minimum error factor can reach 0.00997 when the attenuation factor of input Gao Si pulse is 0.5 PS.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253

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