A Power Reduction Scheme with Partial Sleep Control of ONU Frame Buffer in Operation

Hiroyuki UZAWA
Kazuhiko TERADA
Koyo NITTA

Publication
IEICE TRANSACTIONS on Communications   Vol.E104-B    No.5    pp.481-489
Publication Date: 2021/05/01
Publicized: 2020/11/11
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2020EBP3080
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
power reduction,  frame buffer,  PON,  ONU,  

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Summary: 
The power consumption of optical network units (ONUs) is a major issue in optical access networks. The downstream buffer is one of the largest power consumers among the functional blocks of an ONU. A cyclic sleep scheme for reducing power has been reported, which periodically powers off not only the downstream buffer but also other components, such as optical transceivers, when the idle period is long. However, when the idle period is short, it cannot power off those components even if the input data rate is low. Therefore, as continuous traffic, such as video, increases, the power-reduction effect decreases. To resolve this issue, we propose another sleep scheme in which the downstream buffer can be partially powered off by cooperative operation with an optical line terminal. Simulation and experimental results indicate that the proposed scheme reduces ONU power consumption without causing frame loss even while the ONU continuously receives traffic and the idle period is short.