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Dynamic Assignment Protocols for Multiwavelength Gigabit-PONs sẽ giới thiệu tới các bạn một số vấn đề chính: Introduction, passive Optical Networks (PON) , GPON Enhancement for MultiWavelength Operation, Multi-Wavelength Network Simulation Model,. Hy vọng tài liệu sẽ hỗ trợ các bạn trong quá trình học tập và nghiên cứu của mình. | Dynamic Assignment Protocols for Multi- wavelength Gigabit-PONs Ali Gliwan A thesis submitted in partial fulfilment of the requirements of the University of Hertfordshire for the degree of Doctor of Philosophy The programme of research was carried out in the Science and Technology Research Institute STRI University of Hertfordshire United Kingdom. October 2010 Abstract The research initiatives addressed in this thesis are geared towards improving the performance of passive optical networks through the development of advanced dynamic bandwidth allocation protocols. In particular the aim of the research undertaken is to enhance the quality of service offered by standard passive optical networks with reduced network costs. To that extent a dynamic multi-wavelength protocol has been developed to increase the network upstream bandwidth and introduce multiple service levels to a fibre to the home-based giga-bit passive optical network. Simulation results have confirmed the reduction of the mean packet delay by adjusting the ITU-T standard G984 giga-bit passive optical network frame format by means of the introduction of extended wavelength band overlay based on the ITU-T Coarse-Wavelength Division Multiplexing grid to support the multi-wavelength functionality. To evaluate the multi-wavelength upstream operation of the newly implemented models in OPNET 2-dimensional Dynamic Bandwidth Allocation algorithms have been introduced to manage the network resources in both the time and wavelength domains. Furthermore the enhanced traffic allocation among the supported wavelengths in new protocol confirmed a performance improvement in the network total capacity and the mean packet delay which demonstrates the I network reliability and improves the quality of the provided service according to the subscriber service level agreement with a minimum guaranteed bandwidth of 100 Mbit s to fulfil applications and associated bandwidth requirements for the next generation access network. .
