山中研究室D1の芦沢君のPLZT光スイッチを用いたマルチキャストに関する論文がCyber Journalに採録されました。
論文に関しては以下の通りです。
Title: On-Demand Multicast Slot Allocation Scheme For Active Optical
Access Network Using PLZT High-Speed Optical Switches
Special Issue: Journal of Selected Areas in Telecommunications (JSAT)
Author(s): K. Ashizawa, T. Sato, K. Tokuhashi, D. Ishii, S. Okamoto, N.
Yamanaka, E. Oki
Abstract:
This paper proposes an on-demand multicast slot allocation scheme for an
active optical access network that uses Mach-Zehnder-type high-speed
optical switches, which are achieved by the Plumbum Lanthanum Zirconate
Titanate (PLZT) switching technology. The Active Optical Network, called
ActiON, is based on slot-based switching. Compared to the Passive
Optical Network (PON), ActiON quadruples the number of subscribers (128
users) per optical line terminal (OLT) and doubles the maximum
transmission distance (40 km) between OLT and optical network units
(ONUs). However, as ActiON uses slot-based switching, it needs a large
number of slots to deliver multicast contents to the requesting users.
This greatly lowers network utilization rates. The proposed multicast
slot allocation scheme overcomes this problem to provide on-demand
multicast services, while keeping the advantages of ActiON. Multicast
delivery is realized by running the Mach-Zehnder-type high-speed optical
switch elements in distribution mode, which forces the switch to behave
as an optical splitter. The proposed scheme iteratively solves the
integer linear programming (ILP) problem to associate multicast users
with slots. Numerical results show that the proposed scheme dramatically
reduces the required number of slots, compared to non-multicast ActiON
and provides comparable the performance of bandwidth efficiency to 10 G-
EPON, and the required computation time of the proposed scheme is less
than 0.3 sec, which is feasible for on-demand services.
