高增益、宽带的集成光波导放大器的研究

【作者】 程珠文；

【导师】 刘永智；

【作者基本信息】 电子科技大学 ， 光学工程， 2004， 硕士

【摘要】 本文首先在理论上分析了集成光波导放大器获得增益的原理,在波长为980nm泵浦光作为泵浦源的条件下,通过解析速率方程和传输方程,对集成光波导放大器的增益特性进行了分析,随后在此基础上提出了获得最大增益的最佳波导长度、最佳波导截面面积、最佳泵浦功率等优化方案,最后引出了Er3+/Yb3+共掺光波导放大器,分析了其增益特性,指出了Er3+/Yb3+共掺技术是高增益集成光波导放大器的发展方向。集成光波导放大器要广泛运用于通信系统,必要条件就是提供足够大的增益带宽。本文首先以新型材料为基础,提出了几种可获得宽带特性的光波导放大器基质;然后进行了采用长周期光栅(LPG)来实现宽带光波导放大器的理论研究及实验模拟;最后类比现在已经较成熟的掺铒光纤放大器,列举了若干适用于光波导放大器的宽带通信的实例。光纤与波导的低损耗耦合是关系到光波导放大器成品增益特性的一个重要方面,本文采用了优化的掩模工艺制作硅V型槽;采用正装耦合、紫外胶固化实现光纤与波导的固定;采用模场分析法讨论了获得最小耦合损耗的条件;最后通过实验实现了光纤与波导的低损耗耦合。采用了离子交换的方法在Er3+/Yb3+共掺磷酸盐玻璃基质上制作出了平面波导,用光刻技术制作出了沟道波导;利用m线技术得到了632.8nm波长的激光在离子交换平面光波导中传播的模折射率;得到了632.8nm波长光通过离子交换沟道波导后的近场图。根据实验测得的模折射率,用反WKB方法求出了离子交换平面波导中折射率的横向分布。最后搭建了光波导放大器实验测试台,测量了Ag+、K+、Na+离子交换(交换时间为2小时,交换温度为370℃)Er3+/Yb3+共掺磷酸盐玻璃光波导放大器的增益特性。更多还原

【Abstract】 In this paper, the theory of integrated waveguide amplifier is introduced at first, its gain characteristics have been investigated by solving numerically propagation equations and rate equations at pump wavelength 980nm, some optimum projects have been introduced. Then erbium-ytterbium co-doped waveguide amplifier (EYCDWA) has been discussed .By analyzing the improved gain characteristics of EYCDWA, some instructive conclusions have been obtained.The integrated waveguide amplifier must have broadband to meet the progress of communication system. A few of feasible projects have been bring forward such as new material 、long period grating(LPG) etc. Comparing to fiber amplifier, several examples of broadband waveguide amplifier have also been particularized. The coupling between fiber and waveguide is important to the gain characteristics of EDWA. In this paper, the principle and fabrication of Si-groove have been introduced. By the method of positive-coupling and solidified with ultraviolet glue, we have realized the coupling with low loss.Planar and channel waveguides are fabricated in erbium/ytterbium co-doped phosphate glass substrate. The mode refractive index of 632.8nm wavelength, which propagates in ion-exchanged planar waveguides, is obtained by m line technology; the near figure for channel waveguide with 632.8nm waveguide is obtained. The refractive index profile of planar waveguide is obtained with inverse WKB method by measured mode refractive index.Finally, the gain characteristics of Er3+/Yb3+ co-doped phosphate glass waveguide amplifiers fabricated by ion-exchange (exchange time: 2 hours、exchange temperature:370oC) have been measured.更多还原