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An asymmetric WDM-EPON structure for the convergence of broadcast and communication  

Hur Jung (School of Electrical Engineering, Kookmin University)
Koo Bon-Jeong (School of Electrical Engineering, Kookmin University)
Park Youngil (School of Electrical Engineering, Kookmin University)
Publication Information
Journal of Broadcast Engineering / v.10, no.2, 2005 , pp. 182-189 More about this Journal
Abstract
In this paper, an asymmetric WDM-EPON transmission scheme is proposed to be used in a high speed access network system, which is required to implement the convergence of broadcast and communication. WDM is used for downstream transmission from OLT to access nodes, satisfying wide bandwidth requirement for broadcasting and various multimedia services. And an EPON scheme, which is cheaper than WDM, is applied to upstream transmission where less bandwidth is required. A transmission test in physical layer was performed successfully and the results are provided. If ONUs are to be used in a home gateway, its protocol should be appropriate to its traffic pattern. Voice is sensitive to a time delay while data is not. A new dynamic bandwidth assignment protocol for PON system, which can cope with various types of data in access network is proposed and its performance is analysed. A maximum cycle time is specified to achieve the QoS of signals sensitive to time delay. And a minimum window is specified to prevent the downstream control signals from uprising. It is shown by simulation that the proposed EPON protocol can provide a better performance than previous ones.
Keywords
WPON; EPON; MPCP;
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