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Journals and Conferences
We successfully demonstrated 41.3-km-reach and 128-split 10G-EPON system with dualrate semiconductor optical amplifier using commercial access network infrastructure. N:1 PON protection was also applied for the system in order to cost-effectively improve system reliability.
We propose a bandwidth allocation scheme utilizing simple statistical traffic analysis for TDM-PON based mobile fronthaul. Experiments show that excess bandwidth allocation can be reduced while achieving latency under 50 μs.
In 5th generation mobile communications systems (5G), the number of small cells with centralized-radio access network (C-RAN) architecture is expected to increase greatly. Time division multiplexing-passive optical networks (TDM-PON) are promising transmission systems for networks between a baseband unit (BBU) and a remote radio head (RRH). However, there… (More)
We successfully demonstrate a 41.3-km-reach and 128-split 10G-EPON system with dual-rate semiconductor optical amplifier on a commercial access network infrastructure. It uses N:1 optical subscriber unit (OSU) protection in order to improve system reliability cost-effectively. N:1 OSU protection also can switch from active system to redundant system without… (More)
We propose a novel technique for the accommodation of mobile base stations (BSs) and a secondary system with a time division duplex (TDD) frame monitor. By increasing the number of BSs accommodated in a passive optical network (PON), the cost of mobile fronthaul (MFH) can be reduced. To realize even further cost reduction, a secondary system is accommodated… (More)
The relentless increase in network capacity is making it important to reduce power consumption. In optical access network systems, the buffer size in layer-2 switches, which aggregate multiple passive optical network systems, is expanding as the network speed increases, and the buffer is now significant in terms of power consumption. An effective way to… (More)
A time division multiplexing-passive optical network (TDM-PON) has been attracting attention with a view to realizing the cost-effective mobile fronthaul (MFH) of a mobile base station (BS). A cost-effective MFH is needed because a lot of BSs will be densely deployed in fifth generation mobile networks (5G). A TDM-PON is capable of reducing the network cost… (More)
It is important to economize the infrastructure of the access network and enhance its profitability because it represents the greatest part of network infrastructure cost. As 10G-EPON can be cost-effectively shared among various access services, it is one of the strong candidates to reduce the infrastructure cost of the next-generation access network. To… (More)
A time-division-multiplexing passive optical network (TDM-PON) accommodating a time-division duplex (TDD)-based mobile fronthaul (MFH) contributes to the realization of a low-cost network. However, there are two issues with the TDM-PON. The first is the limited number of optical network units (ONUs) that can be accommodated because the statistical… (More)
As network speeds (capacities) are increasing, it has become more important to reduce network power consumption. In passive optical networks, reducing the buffer size in aggregation layer-2 switches is an effective solution, but it can lead to the decrease of bandwidth efficiency. In this paper, we propose a dynamic bandwidth allocation scheme that avoids… (More)