Study and Demonstration of Sleep and Adaptive Link Rate Control Mechanisms for Energy Efficient 10G-EPON

• Published in: Journal of optical communications and networking Vol. 2; no. 9; pp. 716 - 729
• Main Authors: Kubo, Ryogo, Kani, Jun-ichi, Ujikawa, Hirotaka, Sakamoto, Takeshi, Fujimoto, Yukihiro, Yoshimoto, Naoto, Hadama, Hisaya
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.09.2010; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive control systems; Adaptive link rate (ALR) control; Communication systems; Downlink; Mathematical analysis; Mathematical models; Optical communication; Optical network units; Optical switches; Optical transmitters; Passive optical network (PON); Passive optical networks; Power demand; Power saving; Sleep; Sleep control; Switches; Traffic engineering; Traffic flow
• DOI: 10.1364/JOCN.2.000716
• ISSN: 1943-0620

This paper describes sleep and adaptive link rate (ALR) control functions to reduce the power consumption of optical network units (ONUs) in 10 Gb/s Ethernet passive optical network (10G-EPON) systems. A hybrid mechanism that includes both sleep and ALR control functions is proposed with a view to further improving the power-saving performance. The sleep control function switches the ONU mode, i.e., active or sleep, depending on the presence or absence of traffic. The ALR control function switches the downlink rates between an optical line terminal (OLT) and an ONU, i.e., 1 Gb/s or 10 Gb/s, depending on the quantity of traffic. The proposed hybrid mechanism offers effective power management of ONUs on the basis of the traffic conditions. The proposed hybrid mechanism is validated by a numerical simulation and an experiment.