Author Affiliations
Abstract
Key Laboratory of Optical Communication and Lightwave Technologies, Ministry of Education, Beijing University of Posts and Telecomnunications, Beijing 100876E-mail: zhch.xie@gmail.com
Cyclic polling-based dynamic wavelength and bandwidth allocation algorithm supporting differentiated classes of services in wavelength division multiplexing (WDM) passive optical networks (PONs) is proposed. In this algorithm, the optical line terminal (OLT) polls for optical network unit (ONU) requests to transmit data in a cyclic manner. Services are categorized into three classes: expedited forward (EF) priority, assured forwarding (AF) priority, and best effort (BE) priority. The OLT assigns bandwidth for different priorities with different strategies. Simulation results show that the proposed algorithm saves a lot of downstream bandwidth under low load and does not show the light-load penalty compared with the simultaneous and interleaved polling schemes.
周期轮询 动态波长和带宽分配算法 波分复用无源光网络 服务等级 060.4510 Optical communications 060.2330 Fiber optics communications 060.4250 Networks Chinese Optics Letters
2009, 7(4): 04344