Abstract
Hybrid WDM–TDM PON (wavelength division multiplexing–time division multiplexing passive optical network) that applies wavelength-independent or colorless ONU (optical network unit) technologies will further reduce implementation and maintenance expenses. The “wavelength-reuse” colorless ONU technology imposes a physical constraint in the hybrid WDM–TDM PON that the same wavelength is used for both upstream and downstream traffic transmission of an ONU. This physical constraint brings a new challenge to developing traffic scheduling algorithms in the network, as upstream traffic scheduling is no longer independent of downstream traffic scheduling and the existing traffic scheduling algorithms that treated the upstream and downstream traffic independently cannot be applied in this case. We propose a new traffic scheduling algorithm that takes both directions’ traffic scheduling into account at the same time. A logical PON concept is defined, and wavelength resource sharing is performed based on reconfiguring logical PONs. Simulation study on this algorithm is conducted, and results show that it achieves efficient wavelength and bandwidth resource sharing in the network.
Similar content being viewed by others
References
Kazovsky L.G., Shaw W., Gutierrez D., Cheng N., Wong S.: Next-generation optical access networks. J. Lightwave Technol. 25(11), 3428–3442 (2007)
Hsueh Y.-L., Rogge M.S., Yamamoto S., Kazovsky L.G.: A highly flexible and efficient passive optical network employing dynamic wavelength allocation. IEEE/OSA J. Lightwave Technol. 23(1), 277–286 (2005)
Kani J.-I.: Enabling technologies for future scalable and flexible WDM–PON and WDM/TDM-PON systems. IEEE J. Sel. Top. Quantum Electron. 16(5), 1290–1297 (2009)
Hara, K., et al.: Flexible load balancing technique using dynamic wavelength bandwidth allocation (DWBA) toward 100 Gbit/s-class-WDM/TDM-PON. In: Proceedings of European Conference and Exhibition on Optical Communications (ECOC), Tu.3.8.2 (2010)
Cheng, X., Yeo, Y.-K., Xu, Z., Shao, X., Wang, Y.: Hybrid WDM/TDM passive optical network with dynamic virtual PON (VPON) capability. In: Proceedings of European Conference and Exhibition on Optical Communications (ECOC), P6.07. (2010)
Dhaini A.R., Assi C.M., Maier M., Shami A.: Dynamic wavelength and bandwidth allocation in hybrid TDM/WDM EPON networks. IEEE/OSA J. Lightwave Technol. 25(1), 277–286 (2007)
McGarry M.P. et al.: Just-in-time scheduling for multichannel EPONs. IEEE/OSA J. Lightwave Technol. 26(10), 1204–1216 (2008)
Song, H., Mukherjee, B., Park, Y., Yang, S.: Shared-wavelength WDM–PON access network for supporting downstream traffic with QoS. In: Proceedings of Optical Fiber Communications Conference (OFC) OThK2 (2006)
Alfani, M., Finochietto, J.M., Neri, F.: Efficient multicast bandwidth allocation in TDM-WDM PONs. In: Proceedings of Optical Fiber Communications Conference (OFC) JYhA82 (2009)
Chang G.-K. et al.: Key technologies of WDM–PON for future converged optical broadband access networks. J. Opt. Commun. Netw. 1(4), C35–C50 (2009)
McGarry M.P., Reisslein M., Maier M., Keha A.: Bandwidth management for WDM EPONs. J. Opt. Netw. 5(9), 637–654 (2006)
Kiaei M.S., Meng L., Assi C., Maier M.: Efficient scheduling and grant sizing methods for WDM PONs. IEEE/OSA J. Lightwave Technol. 28(13), 1922–1931 (2010)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhou, L., Wong, N.HL., Yeo, YK. et al. Traffic scheduling in hybrid WDM–TDM PON with wavelength-reuse ONUs. Photon Netw Commun 24, 151–159 (2012). https://doi.org/10.1007/s11107-012-0375-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11107-012-0375-x