Heuristic polling sequence to enhance sleep count of EPON

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 a...

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Bibliographic Details
Published in:Frontiers of Optoelectronics (Online) 2019, Vol.12 (4), p.422-432
Main Authors: RAYAPATI, Bhargav Ram, RANGASWAMY, Nakkeeran
Format: Article
Language:English
Subjects:
Biomedical Engineering and Bioengineering
Computer simulation
Electrical Engineering
Engineering
Ethernet
Ethernet passive optical network (EPON)
Fiber optic networks
Idling
Optical communication
optical network unit (ONU)
Optical wireless
Physics
polling sequence
power conservation
Power consumption
Reduction
Research Article
Vertical cavity surface emission lasers
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Summary: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 W and 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.
ISSN:2095-2759
2095-2767
DOI:10.1007/s12200-019-0906-5