【作者】 张瑞宝；

【导师】 李永放；

【作者基本信息】 陕西师范大学 ， 光学， 2006， 硕士

【摘要】 基于光纤非线性效应的光纤参量放大以其高增益、宽带宽、具有相敏特性、产生闲频带等显著优点在光通信领域引起了人们的关注。光纤参量放大具有很高的转换效率，且由于是基于无源光纤，转换带宽大大增加，转换过程噪声指数很小，它是一种很有技术优势、适用于未来全光传送网的全光波长转换技术。利用光纤参量放大，可以实现光通信中绝大部分全光操作，光纤参量放大在密集波分复用系统、全光网等领域将有非常广泛而重要的运用。 本文主要做了以下五个部分的工作： 第一，详尽地介绍了光波在光纤中传输的基本理论，内容涉及光纤的非线性特性、色散、四波混频原理及四波混频中相位匹配等问题。由于光纤参量放大基于光纤的三阶非线性效应，因此论文介绍了如何从麦克斯韦方程组出发，结合四波混频原理得到小信号近似条件下，信号光、泵浦光和闲频光在光纤中传输的非线性耦合方程组，这些方程组是讨论光纤参量放大的基础。 第二，介绍了一种新型光纤——光子晶体光纤。与传统单模光纤相比，它具有三大突出特点：1)．在很大频率范围内支持光的单模传输；2)．允许改变纤芯的有效截面积，以加强或减弱光纤中的非线性效应；3)．可灵活设计光纤的色散和色散斜率，并且可灵活改变光纤的零色散波长。由于光子晶体光纤的优越特性很有利于光纤参量放大的优化，具有非常诱人的发展前景，因此近年来成为国际上研究的热点之一。 第三，根据光波在光纤中传输的非线性耦合方程组对双泵浦光纤参量放大的工作原理、特点进行了综合分析，从理论上详细地讨论了泵浦光功率、光纤非线性系数、光纤长度、光纤零色散波长、光纤的色散、两泵浦光波长的差值及两泵浦光中心波长与光纤零色散波长之间的差值等因素对光纤参量放大增益、带宽及增益谱平坦性的影响，并由讨论提出了一些改进方案。接着，在光子晶体光纤的基础上，采用龙格—昆塔算法，对光波在光纤中传输的非线性耦合方程组进行了大量、细致的数值模拟，得到了光纤末端信号光的增益谱，验证了本文在理论部分讨论的各种因素对光纤参量放大的影响，得出了这些因素对光纤参量放大影响的具体细节内容。对一些从理论中没有直接得到的影响光纤参量放大增益的因素，例如两泵浦光功率的差值等，也做出了具体的数值分析。更多还原

【Abstract】 In optic communication field, for the marked characteristics of high gain, broad gain bandwidth, having phase sensitivity, can creating idler bandwidth and so on, the fiber-optic parametric amplification based on fiber nonlinear effect has arisen people’s attention. Fiber-optic parametric amplification has very high conversion efficiency, furthermore, because it based on passive fiber, so the conversion bandwidth was very wide, and the noise index in the course of conversion was very small, it is a technic, which is superior and can be applied in the all-optical wavelength conversion of future All-Optical transmission network. Using fiber-optic parametric amplification can realize most all-optical operations in optic communication, fiber-optic parametric amplification will have wide and important application in density wavelength division multiplexer system and all-optical network.The work of this thesis has four parts:First, we described the basic theory of lightwaves transmitting in fiber in detail. The contents relate to the nonlinear characteristic, dispersion of fiber, the theory of four wave mixing, phase matching in four wave mixing and so on. Since fiber-optic parametric amplification is based on three-order nonlinear effect of fiber, so by combining with the theory of four wave mixing, the thesis introduced how to begin with Maxwell equations to elicit the nonlinear coupling equations of signal, pump and idler transmitting in fiber synchronously under the condition of little signal analysis, these equations are the basic to discuss fiber-optic parametric amplification.Second, we introduced a new style of fiber-photonic crystal fiber, it has three main advantages compared with traditional single mode fibers: 1). It supports single mode transmission in a large frequency extension; 2). It allows to change the effective area of fiber core to strengthen or weaken nonlinear effects; 3). The dispersion and the dispersion slope of fiber can be designed agilely, and also the zero dispersion wavelength can be changed. Photonic crystal fiber is good for fiber-optic parametric amplification optimization and has a interesting foreground because of it’s advantages, so recently, the research of fiber-optic parametric amplification using photonic crystal更多还原