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Heuristic polling sequence to enhance sleep count of EPON

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Abstract

Next-generation passive optical networks (PONs) demand power conservation to create a green environment. A reduction in power consumption of the traditional Ethernet passive optical network (EPON) can be achieved by increasing the sleep count in optical network units (ONUs). In this paper, this is accomplished by introducing a first-in-last-out (FILO) polling sequence in the place of a fixed polling sequence to increase the number of ONUs entering sleep mode (sleep count). In a fixed polling sequence, the optical line terminal (OLT) allocates idle time to the ONUs based on the overall load of the ONUs. This leads to a situation that whenever the idle time does not meet the wakeup time threshold of sleep mode, the ONUs are put into doze/active mode, which consumes more power. In the FILO polling sequence, the first polled ONU in the current cycle is made to be polled last in the following cycle. Polling continues in this way, and by this rearrangement, the idle time of delayed poll ONUs increases; hence, it helps to reduce the power consumption. Additionally, a modified load adaptive sequence arrangement (MLASA) method is suggested, where the ONUs are categorized into doze ONUs and sleep ONUs. A numerical simulation of the FILO polling sequence with a vertical cavity surface emitting laser (VCSEL) ONU shows a maximum reduction in power consumption of 15.5 Wand a 20% improvement in energy savings compared with the traditional fixed polling sequence. The MLASA method results in better power consumption with minimum delay than that of the proposed FILO and existing LASA methods.

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Authors and Affiliations

  1. Department of Electronics Engineering, Pondicherry University, Pondicherry, 605014, India

    Bhargav Ram Rayapati & Nakkeeran Rangaswamy

Authors
  1. Bhargav Ram Rayapati
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  2. Nakkeeran Rangaswamy
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Correspondence to Bhargav Ram Rayapati.

Additional information

Bhargav Ram Rayapati is a research scholar at Pondicherry University, Pondicherry. He received his B.Tech. degree in Electronics and Communication Engineering from Gudlavalleru Engineering College affiliated with Jawaharlal Nehru Technological University-Kakinada in 2011 and his M.Tech. degree in Electronics and Communication Engineering (with diversification in computers and communications) from Jawaharlal Nehru Technological University-Kakinada in 2014. He is currently working toward a Ph.D. degree in the Department of Electronics Engineering, Pondicherry University, Pondicherry, India. His current research interests are optical networks and energy-efficient technologies.

Nakkeeran Rangaswamy received his B.Sc. degree in Science and B.E. degree in Electronics and Communication Engineering from Madras University in 1987 and 1991, respectively, and his M.E. degree in Electronics and Communication Engineering (with diversification in optical communication) from Anna University in 1995. He received the Ph.D. degree from Pondicherry University in 2004. Since 1991, he has been working in the teaching profession. Presently, he is an associate professor at Pondicherry University. He is a life member of IETE, ISTE, OSI, and IE(I). Additionally, he is a senior member of IEEE and member of OSA, SPIE and IEICE. He has published more than 180 papers in national and international conference proceedings and journals. He has coauthored a book published by PHI. His areas of interest are optical communication, networks, antennas, electromagnetic fields, and wireless communication.

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Rayapati, B.R., Rangaswamy, N. Heuristic polling sequence to enhance sleep count of EPON. Front. Optoelectron. 12, 422–432 (2019). https://doi.org/10.1007/s12200-019-0906-5

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  • DOI: https://doi.org/10.1007/s12200-019-0906-5

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