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Advanced Bragg grating based integrated optical devices for wavelength division multiplexing systems

机译：基于高级布拉格光栅的集成光学器件，用于波分复用系统

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摘要

This thesis presents experimental and theoretical work towards the development of advanced integrated planar optical devices for wavelength division multiplexing (WDM) applications in optical communication systems. The presented work lies within a broad range of research areas, namely: design and simulation of novel Bragg grating based WDM passive devices, their performance characterization in simulated optical communication systems, fabrication and characterization of photosensitive thin films and finally device fabrication using ultraviolet induced refractive index changes. A complete model for the analysis of Bragg grating assisted devices in waveguide structures has been developed. Bragg grating based optical Add/Drop multiplexers (OADM) have been simulated and studied by using this modelling tool. A fully optimised design for an OADM based on null coupler and tilted Bragg grating has been proposed. This device can exhibit optimised Add and Drop actions with suppressed backreflections and crosstalk to a level lower than -40 dB. A novel interferometric OADM configuration based on a full cycle full (100%) coupler is also proposed. This design exhibits fully optimised and symmetrical Add/Drop actions in contrast to the compromised performance of traditional interferometric configurations. A software simulation tool has also been developed and employed for the theoretical characterization of optical filters, linking this way the proposed devices to real communication system issues related to high bit rate WDM networks. The effect of group delay ripple in WDM filters is studied for different modulation formats and a simplified figure of merit is proposed for the characterization of the effect. For the fabrication of photosensitive thin film structures, a prototype in-house Flame Hydrolysis Deposition facility was built and it was initially characterized. Further experimental work involved detailed analysis and characterization of highly photosensitive Lead Germanate glasses grown by Pulsed Laser Deposition. A developed direct UV-writing facility is presented and major issues around the functionality of the technique are discussed, by demonstrating solutions for the control of the optical system. A rapid heat treatment technique is also proposed for locking the enhanced photosensitivity in deuterium loaded germanosilicate glasses and successful preliminary results are demonstrated. This method should allow finally the fabrication of complex all-UV-written devices, which has been limited to date by the degrading photosensitivity during UV writing, due to rapid deuterium outdiffusion.
机译：本文提出了用于光通信系统中波分复用（WDM）应用的高级集成平面光学器件开发的实验和理论工作。提出的工作属于广泛的研究领域，即：基于新型布拉格光栅的WDM无源器件的设计和仿真，它们在模拟光通信系统中的性能表征，光敏薄膜的制造和表征以及最后使用紫外线感应折射的器件制造。索引更改。已经开发了用于分析波导结构中布拉格光栅辅助设备的完整模型。使用该建模工具已经对基于布拉格光栅的光学分插复用器（OADM）进行了仿真和研究。提出了一种基于零耦合器和倾斜布拉格光栅的OADM的完全优化设计。该设备可以表现出优化的添加和删除动作，并具有抑制的背向反射和串扰至低于-40 dB的水平。还提出了一种基于全周期全（100％）耦合器的新型干涉式OADM配置。与传统干涉测量配置的性能受损相比，该设计具有完全优化和对称的加/减动作。还开发了一种软件仿真工具，并将其用于光学滤波器的理论表征，通过这种方式将建议的设备链接到与高比特率WDM网络有关的实际通信系统问题。针对不同的调制格式，研究了WDM滤波器中群时延波纹的影响，并提出了简化的品质因数表征方法。为了制造光敏薄膜结构，建立了内部火焰水解沉积原型设备，并对其进行了初步表征。进一步的实验工作包括通过脉冲激光沉积法生长的高感光性锗酸铅玻璃的详细分析和表征。通过演示用于控制光学系统的解决方案，介绍了已开发的直接UV写入工具，并讨论了围绕该技术功能的主要问题。还提出了一种快速热处理技术，用于锁定氘化锗硅酸盐玻璃中增强的光敏性，并证明了成功的初步结果。该方法最终应允许制造复杂的全紫外写入器件，由于氘的快速扩散，迄今为止，由于紫外写入期间光敏性的降低，这种器件受到了限制。

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    Riziotis C.;

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  • 年度 2002
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  • 原文格式 PDF
  • 正文语种 en
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