Mr. Ashizawa’s paper regarding with active optical access network was accepted for journal of IEICE as follows.

Title: Scalable Active Optical Access Network Using Variable High-Speed PLZT Optical Switch/Splitter
Authors: Kunitaka Ashizawa, Takehiro Sato, Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto, Naoaki Yamanaka, and Eiji Oki
Summary: This paper proposes a scalable active optical access network using high-speed Plumbum Lanthanum Zirconate Titanate (PLZT) optical switch/splitter. The Active Optical Network, called ActiON, using PLZT switching technology has been presented to increase the number of subscribers and the maximum transmission distance, compared to the Passive Optical Network (PON). ActiON supports the multicast slot allocation realized by running the PLZT switch elements in the splitter mode, which forces the switch to behave as an optical splitter. However, the previous ActiON creates a tradeoff between the network scalability and the power loss experienced by the optical signal to each user. It does not use the optical power efficiently because the optical power is simply divided into 0.5 to 0.5 without considering transmission distance from OLT to each ONU. The proposed network adopts PLZT switch elements in the variable splitter mode, which controls the split ratio of the optical power considering the transmission distance from OLT to each ONU, in addition to PLZT switch elements in existing two modes, the switching mode and the splitter mode. The proposed network introduces the flexible multicast slot allocation according to the transmission distance from OLT to each user and the number of required users using three modes, while keeping the advantages of ActiON, which are to support scalable and secure access services. Numerical results show that the proposed network dramatically reduces the required number of slots and supports high bandwidth efficiency services and extends the coverage of access network, compared to the previous ActiON, and the required computation time for selecting multicast users is less than 30 msec, which is acceptable for on-demand broadcast services.

Mr. Nomura’s paper regarding with the experimental results of the MiDORi GMPLS technology is accepted as an oral presentation for the OFC/NFOEC 2012 as follows.

Title: Dynamic Topology Reconfiguration for Energy Efficient Multi-layer Network using Extended GMPLS with Link Power Control
Authors: Yuki Nomura, Haruka Yonezu, Daisuke Ishii, Satoru Okamoto, Naoaki Yamanaka
Session: Multi-layer Awareness and Management
Pres. number: NTu2J.6

Abstract: This paper proposes an energy efficient multi-layer network using extended GMPLS with link power control. The experimental result shows that dynamic energy saving according to traffic volume is realized by layer-1 and layer-2 unified control.

EpiPhotonics, with which we have researched, developed of new low-loss electro-optic (Pb,LA)(ZrTi)O3 (PLZT) waveguides for nanosecond-speed optical switching.

The loss figures for the newly developed buried PLZT waveguide reached “below 1 dB/cm” against the previous PLZT waveguides. Since the PLZT waveguide size is only in the range from 1 cm to 2 cm, now PLZT switches have very competitive loss figures when compared to other available options. Minimum fiber to fiber insertion losses are 4 dB for a 1×8 switch and 5 dB for a 4×4 switch, for example.

EpiPhotonics will exhibit newly developed PLZT optics switches at Photonics West 2012 in San Francisco and OFC/NFOEC 2012 in Los Angeles.

• EpiPhotonics, Press Release, “EpiPhotonics developed low-loss PLZT waveguide for scalable high-speed optical switches”
• Lightwave News: EpiPhotonics touts PLZT waveguide for scalable high-speed optical switches

Mr. Shibuta made presentations at Technical Committee on Network System (NS) in December 15-16.

The titles and authours are as follows.

Authors: Naohiko Shibuta, Kenta Nakahara, Kou Kikuta, Daisuke Ishii, Satoru Okamoto, Eiji Oki, Naoaki Yamanaka
Title： Service Composition System Optimizing Network and Service Resources in E3-DCN
Abstract： We previously presented Ubiquitous Grid Networking Environment (uGrid). In uGrid, everything on the network such as devices, contents, and software is defined as Service-Part, and users are provided with composition of the several Service-Parts on the network. Recently, Data Centric Network (DCN) which users require of the network by contents names, and receive contents is studied widely. Then, we propose Energy Efficient, and Enhanced-type Data Centric Network (E3-DCN) which is extended DCN based on uGrid. In the E3-DCN, if the requested contents are not found in the network, the network constructs the requested contents with Service-Parts. In addition to that, E3-DCN aims at energy efficiency and mobility. In this paper, we propose a cost reduction method by Service-Parts copy as part of E3-DCN. Cost is reduced by copying the Service-Parts which have a software function to the optimal position. By the evaluation using ILP (Integer Linear Programming), it is shown that the case with Service-Parts copy can reduce the cost of service.

To reduce the energy consumption in the IP and Ethernet transport network, Yamanaka Lab. focuses on automatically construct the least energy consumption network topology by using traffic engineering and dynamically powering off interfaces of routers/switches.

This time, a self organized network which automatically recognizes physical network topology, automatically generate a configuration file, and automatically constructs the least energy consumption network topology by self path reroute and port power and switch module on/off control with the MiDORi GMPLS protocol.

Yamanaka Lab. will exhibit the demonstration of this self-organized network at the Keio Techno-Mall2011 at Tokyo International Forum on Dec. 9.

Press Release form Keio Univ. on Dec. 7, 2011 [Japanese]

Yamanaka Lab. will exhibit at the Keio-Technomall2011 at Tokyo International Forum on Dec. p.

The research topics we will exhibit this year are the followings.
「Multi-(layer, path, and resources) Dynamically Optimized Routing 　－MiDORi-」
「Active Optical Access Network -ActiON-」
「Ubiquitous Grid Network」
「Energy Virtual Network Operator　－EVNO-」

You can see the location of these booths(46-47,52-53) and research outlines here.

Please come and see us!