正交双泵浦偏振不敏感光纤参量放大器的研究
发布时间：2018-08-18 16:30
【摘要】：基于四波混频(FWM)效应的光纤参量放大(FOPA)技术由于具有大带宽、低噪声、对信号的调制格式和比特率完全透明等显著特点,一直是光纤放大技术研究的热点之一。本论文围绕偏振不敏感光纤参量放大器展开研究,详细地研究了偏振不敏感光纤参量放大器对偏振复用信号的放大特性。主要研究内容如下:1.深入研究了 FOPA的基本理论,简要概述了 FWM的物理机制,讨论了实现相位匹配的方法,并详细地介绍了 FOPA偏振效应的基本理论。2.从正交双泵浦结构FOPA的矢量耦合波方程组出发,在小信号条件下,推导出了两个偏振态方向上信号光的参量增益表达式。采用四阶-龙格库塔算法,数值仿真了小信号条件下的参量增益特性,结果表明小信号模型下参量增益与输入信号光偏振态的无关性,并数值模拟了考虑泵浦损耗时的参量增益曲线,详细地分析了泵浦光功率、光纤非线性系数和光纤长度对参量增益的影响。在实际应用中可以选择合适的参数,使得FOPA工作在较好状态。3.研究了偏振不敏感FOPA对偏振复用信号的放大特性。采用对称分步傅里叶算法,数值计算了两路偏振复用信号在FOPA的放大特性,结果显示两路偏振复用信号具有相同的参量增益。并且详细地研究了不同调制格式(NRZ-OOK调制、DPSK调制、QPSK调制)和不同信号功率的两路偏振复用信号的增益特性,结果表明在小信号模型下偏振不敏感FOPA可以实现对偏振复用信号调制格式完全透明的放大。
[Abstract]:Fiber Optic Parametric Amplification (FOPA) technology based on four-wave mixing (FWM) (FWM) effect has been one of the hotspots in optical fiber amplifying technology due to its advantages of large bandwidth, low noise, complete transparency of modulation format and bit rate, and so on. In this paper, the polarization insensitive fiber parametric amplifiers (PPAs) are studied in detail. The main research contents are as follows: 1. The basic theory of FOPA is deeply studied, the physical mechanism of FWM is briefly summarized, the method of phase matching is discussed, and the basic theory of polarization effect of FOPA is introduced in detail. Based on the vector coupled wave equations of FOPA with orthogonal double pump structure, the parametric gain expression of the signal light in two polarized states is derived under the condition of small signal. By using the fourth-order Runge-Kutta algorithm, the parametric gain characteristics under small signal conditions are numerically simulated. The results show that the parametric gain is independent of the polarization state of the input signal under the small-signal model. The parametric gain curve considering pump loss is numerically simulated, and the effects of pump power, fiber nonlinear coefficient and fiber length on parametric gain are analyzed in detail. In practical application, the appropriate parameters can be selected to make the FOPA work in a better state. 3. The amplification characteristics of polarization multiplexed signals by polarization insensitive FOPA are studied. The amplification characteristics of two polarization multiplexing signals in FOPA are numerically calculated by using the symmetric discrete step Fourier algorithm. The results show that the two polarization multiplexing signals have the same parametric gain. The gain characteristics of different modulation formats (NRZ-OOK modulation / DPSK modulation / QPSK modulation) and two polarization multiplexing signals with different signal power are studied in detail. The results show that polarization-insensitive FOPA can amplify the modulation format of polarization multiplexed signals completely transparently under the small signal model.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN722
本文编号：2190035
[Abstract]:Fiber Optic Parametric Amplification (FOPA) technology based on four-wave mixing (FWM) (FWM) effect has been one of the hotspots in optical fiber amplifying technology due to its advantages of large bandwidth, low noise, complete transparency of modulation format and bit rate, and so on. In this paper, the polarization insensitive fiber parametric amplifiers (PPAs) are studied in detail. The main research contents are as follows: 1. The basic theory of FOPA is deeply studied, the physical mechanism of FWM is briefly summarized, the method of phase matching is discussed, and the basic theory of polarization effect of FOPA is introduced in detail. Based on the vector coupled wave equations of FOPA with orthogonal double pump structure, the parametric gain expression of the signal light in two polarized states is derived under the condition of small signal. By using the fourth-order Runge-Kutta algorithm, the parametric gain characteristics under small signal conditions are numerically simulated. The results show that the parametric gain is independent of the polarization state of the input signal under the small-signal model. The parametric gain curve considering pump loss is numerically simulated, and the effects of pump power, fiber nonlinear coefficient and fiber length on parametric gain are analyzed in detail. In practical application, the appropriate parameters can be selected to make the FOPA work in a better state. 3. The amplification characteristics of polarization multiplexed signals by polarization insensitive FOPA are studied. The amplification characteristics of two polarization multiplexing signals in FOPA are numerically calculated by using the symmetric discrete step Fourier algorithm. The results show that the two polarization multiplexing signals have the same parametric gain. The gain characteristics of different modulation formats (NRZ-OOK modulation / DPSK modulation / QPSK modulation) and two polarization multiplexing signals with different signal power are studied in detail. The results show that polarization-insensitive FOPA can amplify the modulation format of polarization multiplexed signals completely transparently under the small signal model.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN722
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