【作者】 池晓金；

【导师】 乐孜纯； 张明；

【作者基本信息】 浙江工业大学 ， 通信与信息系统， 2008， 硕士

【摘要】 声光可调谐滤波器(AOTF,Acousto-optic tunable filter)因具有波长调谐范围宽、滤波带宽窄、调谐速度快、同时对多波长操作等优点,广泛应用于波分复用网络(WDM)中。利用声光可调谐滤波器可以实现滤波器、光开关、增益均衡器等多种光器件,特别是可以用于实现光学分插复用器(OADM,OpticalAdd/Drop Multiplexer)。实际的光纤通信系统中要求AOTF器件的工作不依赖于偏振,以适应光网络中偏振状态随机变化的光信号。而且单级的AOTF已经不能满足WDM更高的滤波特性的要求,需要研制两级甚至多级的结构。本文的主要内容就是在理论上对单级和两级AOTF进行深入研究,设计结构参数,并实验制作器件。论文的第二章介绍了声光可调谐滤波器(AOTF)的理论基础,其中包括声光作用的原理、光信号的偏振态、声表面波的产生和传播、声光耦合作用等。论文的第三章具体介绍了如何在铌酸锂晶体上设计AOTF的各个模块,包括光波导、模分离器、声波导和叉指换能器等,并分别给出了它们的设计参数。论文的第四章指出了单级AOTF存在的缺陷,提出设计多级AOTF的需要,重点研究了利用光学反射镜来构造两级AOTF,得到了优化的滤波特性。论文的最后对AOTF的制作工艺进行了研究:介绍了工艺的制作流程和材料的选取,设计了掩模版的结构,通过反复的实验,分别制作了光波导、模分离器、声波导和叉指换能器等部分,最终完成AOTF的制作。更多还原

【Abstract】 The acousto-optic tunable filter (AOTF) has been widely used in Wavelength Division Multiplexing (WDM), for it has the characteristics of wide tunable range, narrow bandwidth, fast tunable velocity and simultaneous multiwavelength filter. It can be served as optical filter, optical switch and gain equalizers especial applied in Optical Add/Drop Multiplexer (OADM). For the polarization of optical signal in the fiber communication system is random, it requires that the apparatus is not polarization relied. Furthermore, the single stage AOTF can not satisfy the requirement of better filter characteristics in WDM systems. It needs double-stage structure and even more. The main content of this thesis is to make a deeply research in theory of one-stage and double-stage AOTF and fabricate the apparatus.In the second chapter of the thesis, the basic principle of AOTF was introduced, including the effect of acousto-optic, polarization of optical signal, the production and transmitting of SAW (Surface Acoustic Wave), acousto-optic coupling theory. In the third chapter of the thesis, it was introduced how to design and fabric the main part of AOTF, including optical waveguide, mode splitter, surface acoustic waveguide and interdigital transducer. And it worked out the parameters, respectively. In the fourth chapter of the thesis, it designed the double-stage AOTF to replace the single-stage AOTF because of its imitation. Mainly, it introduced to construct double-stage AOTF of using reflector, an(?) got optimum characteristics. The last part of the thesis was for the study of fabrication technologies of AOTF. It introduced the principles of the lithography. With the repetition of the experiment, we fabricated optical waveguide, mode splitter, surface acoustic waveguide and interdigital transducer. Thus an actual AOTF was obtained.更多还原