【作者】 鲁平；

【导师】 刘德明；

【作者基本信息】 华中科技大学 ， 电子科学与技术， 2005， 博士

【摘要】 波导器件是光通信网络中的关键光电子器件。其性能优劣对光通信系统的传输质量起着决定性的影响。与之相关的波分复用器、光功率分支器、波长解复用光探测阵列模块等成为目前研究的热点。本文围绕新型阵列波导器件开展了深入的理论和实验研究,具体内容如下: (1)研究了阵列波导光栅的工作原理,运用线性系统理论导出了器件传输的数学模型。提出了AWG 结构参数的优化设计方法,给出了32×0.8nm,中心波长为1.54851μm的阵列波导光栅的优化设计实例。(2)提出了一种新的有限差分光束传播方法,在不增加计算时间的基础上有效提高了模拟的精度。介绍了以有限差分光束传输法为核心算法编制的AWG 模拟计算软件,对AWG 中的传输光场进行了详细的分析和计算,并在此基础上对1×4、1×8 和1×32 AWG 的输出光场分布及光谱响应进行了模拟计算。(3)提出了采用偏振相关理论以实现偏振不敏感阵列波导光栅的新方案,有效改善了器件的偏振相关损耗,奠定了研制新型偏振不敏感AWG 的理论基础。并且探讨了提高宽扁形波导与光纤耦合效率的方法。(4)提出了采用离子束辅助沉积制备阵列波导光栅波导材料的新方法,并进行了实验验证。测试结果表明该器件在偏振相关性以及热稳定性等指标上都得到了改善。(5)建立了基于直波导的新型阵列波导光栅的理论模型。详细介绍了新型AWG 结构参数的优化设计。并且基于FD-BPM 方法对新型AWG 进行了模拟计算分析,模拟结果显示采用设计的结构参数,可以获得比较好的解复用效果。分析了自聚焦平板波导GISLAB 的工作性能,得出GISLAB 后焦面上的光场分布正比于物体的傅里叶变换的重要结论。并通过实验验证了GISLAB 的工作特性。(6)提出了一种精度比较高的光敏光纤光敏性的在线测量方法,测得的光纤折射率变化与曝光时间的变化关系与H. Patrick 等人提出的吸收模型的变化规律一致,该方法具有较高的准确性与实用价值。对光敏光纤的光敏性进行了实验研究,通过选择合适的实验条件,使光纤的光致折射率变化率达到1%,而且光纤横截面的折射率分布也比较均匀。这为基于光敏性的波导器件研究奠定了良好基础。(7)探讨了采用Interleaver 以实现1×32 100GHz 密集波分复用器的方法。理论更多还原

【Abstract】 Waveguides have become essential device’s basis in optical networks. The performance of waveguides is very important to influence the communication quality of the optical communication system. These devices such as multiplexer/demultiplexer, optical power splitter, wavelength-decoded optical detect arrayed-module, have become the focus for research. In this dissertation, several theoretical and experimental studies about novel arrayed-waveguide devices have been carried out as the followings: (1) This paper analyzes the characteristic of arrayed-waveguide gratings with the linear systems theory and the optical grating equation is educed. An optimal designing method for AWG is mentioned. A 32×0.8nm AWG multiplexer designed for an example with a center wavelength 1.54851μm is given. (2) A novel FD-BPM is put forwarded which enhance the modeling precision, not needing much more time. Introduce the simulation software based on the FD-BPM. Analyze and calculate the transmission mode in the AWG in detail. Calculate the optical power distributing and the spectrum response in 1×4 、1×8 and 1×32 AWGs. (3) A scheme for novel polarization-insensitive AWG based on polarization-sensitive theory is proposed. Using this method, the intrinsical polarization-sensitivity of AWG can be overcome simply. The method, which improves the coupling efficiency between rectangular waveguide and fiber, is also studied. (4) Novel scheme for fabricating the AWG waveguide material using ion beam assisted deposition (IBAD) is brought forward firstly. Experimental results show that the performances of AWG including polarization-sensitivity and thermal stability are improved. (5) Theoretical model for novel AWG based on straight waveguide is established. The optimal designing method for novel AWG is particularly described. Theoretical simulations for novel AWG using FD-BPM show that this kind of AWG has good performance. The properties of the graded-index slab are analyzed. The important conclusion that the optical field on the back focal plane of the GISLAB is directly proportional to the Fourier transform of the object has been drawn and it has been validated through experiment. (6) An online measure method for the photosensitivity of fiber is proposed. This method has high precision. The relationship between the refractive index of fiber and exposal time is the same as the absorbing model that is brought forward by H. Patrick. The method is very accurate and has high practicality. The photosensitivity of fiber is investigated. The changing rate of the fiber refractive index can reach 1%, and the refractive index is uniform along the cross section of the fiber. The experiment is useful for the research of the photosensitivity of the waveguides. (7) A novel technique to fabricate 1×32 100GHz DWDM adopting Interleaver is studied. The influence that the two-grade Interleaver exerts on the device has been theoretically calculated. The optimal design method has been proposed. (8) A 1×32 100GHz AWG is produced. Based on it, the wavelength-choice optical receiving module is manufactured which realizes the integration between demultiplexer and detectors. This Module has a small size and high working stability, its output performance is good enough to match the application of communication systems, and it has passed the identification of experts. (9) A novel optical power splitter is devised. This device is simple, easy-fabrication and easy-upgradtion. The insert-loss and ununiformity of the device is theoretical calculated, its performances satisfy the actual application. The influence that the position mismatch exerts on the coupling efficiency is analyzed .The theory is very useful for the coupling assembly of the device.更多还原