In this paper, a protection architecture that can be applied to NG-PON2 system, or TWDM-PON, is proposed. NG-PON2 system provides bandwidth as much as 80 Gbps in downstream, and the system failure may cause a serious problem. Therefore, its protection becomes more important issue. We solved this problem by making a pair of OLTs protect with each other. If one OLT is out of order, the protection OLT provides service to two ONU groups in the proposed scheme. For this purpose, each OLT is equipped with two downstream wavelengths: one for itself and the other for the protection. It enhances the reliability of PON systems, which is essential for business application. Since the next generation PON system accommodates many types of users, its service level must be differentiated and this property should be maintained even during a protection mode. To meet this condition, we introduce a bandwidth management scheme to ensure the QoS of each ONU and to maximize the total transmission efficiency at the same time. A shared bandwidth allocation is used for this purpose, and it is compared with exclusive bandwidth allocation scheme. Performance of the proposed systems is studied through extensive analysis.
Photonic Network Communications – Springer Journals
Published: Apr 3, 2015
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