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Tdm Over Wdm-pon System Research

Author: LiWei
Tutor: HuBiChun
School: Huazhong University of Science and Technology
Course: Optical Engineering
Keywords: Hybrid time-division multiplexing and wavelength-division multiplexing Passive optical network (PON) Wavelength de-multiplexer of multiplexer (WDM) All-optical wavelength conversion (AOWC) Optical transceiver module
CLC: TN929.1
Type: Master's thesis
Year: 2009
Downloads: 76
Quote: 1
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Abstract


While the backbone networks and local area networks spread their bandwidth rapidly, the development of the access networks which link the two networks is much slower, and this is the well known“first mile problem”. But since the twelve first century, TDM-PON get extensive attention from government and communication industry and hopefully resolve the problem. However, the challenge of TDM-PON is network capacity. But WDM-PON offers each ONU the privacy and wide bandwidth due to its own wavelength. But restricting the application of WDM in access network is mainly because the number of ONU is much more than the number of wavelength that we can use and the high cost of optical device. Hybird TDM/WDM PON is a smooth migration from TDM-PON to WDM-PON.This thesis aimed at the theoretical research and system implementation of hybrid PON, and the main research content and result is as follows:(1) Four types of the representative hybrid TDM/WDM PON architectures: TDMA based hybrid PON, WDMA based hybrid PON, TDM over WDM-PON, and WDM over TDM-PON, are reviewed and compared in this paper. The research showed that each of these hybrid TDM/WDM PON architectures is actually a compromise between WDM-PON and TDM-PON in terms of capacity and cost, and is designed to take the advantages of power splitting in the TDM-PON and wavelength routing in the WDM-PON, simultaneously achieving low per-subscriber cost and scalability to increase the number of subscribers, while still maintaining a relatively high per-subscriber bandwidth. Another important purpose of the architecture designing for hybrid TDM/WDM PON is to offer an extra degree of flexibility and more scalability, and provide efficient and economical solution(2) TDM over WDM-PON become research direction of this paper because it is the most compatible with present TDM-PON and the most easily expanding network capacity. TDM over WDM-PON make several TDM-PON transmit in a single fiber using DWDM technique. The main research contents: the dense wavelength de-multiplexer of multiplexer system, all-optical wavelength conversion in upstream access, O/E/O wavelength conversion in downstream access, optical transceiver module. TDM over WDM-PON is a smooth migration from TDM-PON to WDM-PON.(3) We tested the system of TDM over WDM-PON respectively in three aspects: insertion loss, return loss and bit error rate. A conclusion of this paper is also presented at last.

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