Mr. Shimada made presentations at Technical Committee on Photonic Network (PN) in June 23-24.

The titles and authours are as follows.

Authors: Yuji Shimada, Takehiro Sato, Kunitaka Ashizawa, Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto, Eiji Oki, Naoaki Yamanaka
Title： Recently,the power consumption of Internet is increasing rapidly. Thus,we have been proposing an optical aggregation network,which reduces the power consumption of today’s Internet greatly. The optical aggregation network connects solitary giant router and thousands of users in transparent 1-hop network. This research proposes new dynamic bandwidth allocation. The propose scheme groups ONUs by considering their distances from OLT (Optical Line Terminal), and calculates their bandwidth allocated to one group while other groups are sending data to OLT. Evaluation shows the proposed scheme achives high bandwidth utilization.

Dr. Okamoto recieved a letter of appreciation from IEICE.

His dedicated activity contributing to journal invigoration in the IEICE Communications Society Journal Editorial Committee was rewarded.
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Mr.Hara’s paper was selected as an award-winning paper of IEEE-ISAS2011.

Title and Auther are bellow.

Title: A Study of Next Generation Metro-Access Hybrid Scalable Network

by Using PLZT Ultra High Speed Optical Wavelength Selective Switch

Authors: Yutaro Hara, Takehiro Sato, Yuji Shimada, Kunitaka Ashizawa,Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto and Naoaki Yamanaka

It will present him at the awarding ceremony that will be held during the Banquet of IEEE-ISAS2011 on Saturday, June 18.

Mr. Ashizawa’s paper regarding with multicast using PLZT optical witch is accepted for Cyber Journal as follows.

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.

Members of Yamanaka Labs. will make presentations on International Symposium at Access Spaces (ISAS) 2011 on 17-19 June 2011.
Members are as follows: Dr. Takenaka, Mr. Sato, Mr. Matsumoto, Mr. Shimada and Mr. Nomura.
The Subjects and the detailed time-line are seen at IEEE-ISAS 2011.

Miss Hirao got “Koizumi taiiku doryoku” award.

This prize is given to students who belong in official sports club of Keio.

Miss Hirao belongs in a “shorinji kempo” (one of Japanese martial arts) club.
She won the first prize in All Japanese students competition of Shorinji kempo last year and got this award.

We are so happy that the student in Yamanaka laboratory got such prize at once.
We wish she will continue to enjoy her great success.

Miss Hirao got Fujiwara reward.

Fujiwara reward is for students who belong in the science and technology department and participate actively in social activities, cultural activities, sports and arts.
And also, that students have to keep good academic results.

Miss hirao was recognized for good academic results and the results of sports and got Fujiwara reward.