論文 - 山中　直明

Minimal-hardware colorless-directionless ROADM based on a single multi-input-port-WSS with joint switching

Masahiko Jinno, Ryunosuke Sasaki, Takuma Izumi, Masahiro Kitada, Takashi Miyamura, Satoru Okamoto & Naoaki Yamanaka

Journal of Optical Communications and Networking 18 （ 3 ） 195 - 205 2026年03月

Analog radio-over-fiber-based 5G smart mobile fronthaul networking testbed with an open-source software base-station system

Kojiro Nishimura, Ryuta Murakami, Yoshihiko Uematsu, Satoru Okamoto, and Naoaki Yamanaka

Journal of Optical Communications and Networking 17 （ 11 ）  2025年11月

Power Saving Impact of Distributed Unit Aggregation in the Switched Radio over Fiber Mobile Front Haul Network

Ryuta Murakami, Kojiro Nishimura, Satoru Okamoto, Yoshihiko Uematsu, Takashi Kurimoto, and Naoaki Yamanaka

IEICE Communications Express (ComEx) 14 （ 10 ） 365 - 368 2025年10月

Non-equidistance dual-fiber 10G-EPON for evaluating emulated ultra-high splitting ratio passive optical network architecture using hollow-core fibers

Takahiro Ishiyama, Satoru Okamoto, and Naoaki Yamanaka

IEICE Communications Express (ComEx) 14 （ 10 ） 369 - 372 2025年10月

Effects and Feasibility of Switched Radio-over-Fiber Networks Combining Analog Radio-over-Fiber and Optical Switching for Future Smart Mobile Fronthaul Networks in the Beyond 5G Era

Ryuta Murakami, Kojiro Nishimura, Satoru Okamoto, Yoshihiko Uematsu, Takashi Kurimoto, Naoaki Yamanaka

IEEE/Optica Journal of Lightwave Technology 43 （ 15 ） 7101 - 7111 2025年08月

2ノード連携型ノードアーキテクチャによる省電力メトロネットワーク

治村 颯葵, 宮村 崇, 岡本 聡, 山中 直明

信学技報 PN2024 （ 7 ） 98 - 104 2025年03月

A-RoF MFH環境下におけるユーザ移動を考慮した省エネルギーセル選択最適化法を適用したL5GスイッチドRoF実証実験

西村浩志朗, 山本迪明, 村上隆太, 植松芳彦, 岡本聡, 久保亮吾, 山中直明

信学技報 PN2024 （ 80 ） 120 - 127 2025年03月

空孔コアファイバを用いた256分岐PONにおける大電力信号・エネルギー同時伝送

山地宥範, 山田夏大, 高木武史, 武笠和則, 岡本聡, 津田裕之, 山中直明, 松浦基晴

信学技法 PN2024 （ 82 ）  2025年03月

Ultra-high splitting ratio access network with optical power feeding using a hollow core fiber

Shumpei Kimura, Zhixin Liu, Motoharu Matsuura, Takeshi Takagi, Kazunori Mukasa, Satoru Okamoto, Naoaki Yamanaka, and Hiroyuki Tsuda

IEICE Commun. Express 14 （ 6 ） 263 - 266 2025年

• Access to Document (DOI)

Construction of the Analog Radio Over Fiber Technology Testbed with Linux PC-Based WiFi Access Points

Kojiro Nishimura, Satoru Okamoto, Ryuta Murakami, Naoaki Yamanaka, Motoharu Matsuura

IEICE Communications Express 13 （ 12 ） 458 - 460 2024年12月

• Access to Document (DOI)

キャンパス敷設空孔コアファイバケーブルを用いたLocal 5G over PON構築実験

岡本 聡,山中 直明,津田 裕之,松浦 基晴,高木 武史,武笠 和則

信学技報 123 （ 163 ） 13 - 20 2024年08月

スイッチドRoFにおける省電力効果", 信学技報PN2023-80, pp58-63, March 2024

村上隆太, 岡本聡, 植松芳彦, 栗本崇, 山中直明

信学技報 PN2023 （ 80 ） 58 - 63 2024年03月

「特別招待講演」光ネットワークの未来を目指して －PN と歩んだ20 年と慶應未来光ネットワークオープン研究センター－

山中直明

信学技報 PN2024 （ 75 ） 32 - 36 2024年03月

Experimental Evaluation on Priority-aware Guaranteed Resource Allocation for Resource Pool Based Reconfigurable Hardware

Masaki Murakami, Takashi Kurimoto, Satoru Okamoto, Naoaki Yamanaka

IEEE/ACM Transactions on Networking (TNET) 2024年02月

最終著者

Pod allocation algorithms to handle time-varying numbers of applications occurrence on the Access-Metro edge computing

Koki Muramatsu, Yoshihiko Uematsu, Satoru Okamoto, Naoaki Yamanaka

IEICE Communications Express 13 （ 2 ） 35 - 38 2024年02月

最終著者

　概要を見る

AMec (Access-Metro edge computing) is a technology that can reduce the number of edge servers by utilizing in-network excess computing resources such as unallocated cores of control CPU of network devices as a node of the AMec cluster. The important issue is service interruption in that computing resources become unavailable due to executing their main job (e.g. device control and management jobs). In this paper, to avoid interruptions, two types of pod allocation algorithms (both static and dynamic thresholds) are evaluated. The dynamic threshold method is effective in keeping a high allocation success rate even for time-varying numbers of application occurrences.

Networking Experiment of Domain-Specific Networking Platform Based on Optically Interconnected Reconfigurable Communication Processors

Murakami M., Kurimoto T., Okamoto S., Yamanaka N., Muranaka T.

IEICE Transactions on Communications （IEICE Transactions on Communications）  E106–B （ 8 ） 660 - 668 2023年08月

ISSN  09168516

　概要を見る

A domain-specific networking platform based on optically interconnected reconfigurable communication processors is proposed. Some application examples of the reconfigurable communication processor and networking experiment results are presented.

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センター型セキュリティ分析のためのジッタ制約を考慮した高速マルチレイヤ経路設計アルゴリズム

村上隆太, 栗本崇, 岡本聡, 山中直明

信学技報 PN2023 （ 24 ） 40 - 46 2023年08月

IoTアプリケーションを収容する次世代PONに向けたONU省電力化手法

石山貴大,山口暉,前田紗永子,栗本崇,岡本聡,山中直明

信学技報 PN2022 （ 57 ） 77 - 82 2023年08月

大電力伝送光ファイバ無線によるBeyond 5Gモバイルフロントホール

岡本聡,山中直明,久保亮吾,松浦基晴,津田裕之

信学技報 PN2022 （ 56 ） 70 - 76 2023年03月

Experimental Evaluation on Priority-Aware Guaranteed Resource Allocation for Resource Pool Based Reconfigurable Hardware

Murakami M., Kurimoto T., Okamoto S., Yamanaka N.

IEEE/ACM Transactions on Networking （IEEE/ACM Transactions on Networking）  32 （ 1 ） 298 - 307 2023年

共著,  ISSN  10636692

　概要を見る

This paper proposes a priority-aware guaranteed hardware resource allocation in virtual packet optical nodes (VPONs) and describes experimental evidence of service provisioning with the proposed method on testbed. A network based on the VPON brings solution of service diversification and traffic explosion because it provides multiple services by hardware level separated virtual networks such as IP/Ethernet/ Multi-Protocol Label Switching. The VPON has reconfigurable hardware which is dedicatedly allocated for each service and service-specific logical functions are implemented respectively. However, a previous hardware resource allocation method is not efficient. In previous work, the hardware resources once allocated to a service are not reallocated until the service terminated whenever the hardware is not optimally used. In recent years, hardware reconfiguration time has become shorter and it has enabled to apply for service demand change by releasing hardware from services with low demand and reallocating it to other services with high demand. Thus, this paper proposes preemptive dynamic hardware resource reallocation algorithm for VPON and a priority-aware guaranteed hardware resource reallocation method to realize efficient resource usage and high service capacity. Results of the computer simulation show improving service capability. Furthermore, to demonstrate the feasibility of service provisioning with the proposed method, emulators of the virtual packet optical node were constructed and performed resource reallocation. Results of the experiment show that the virtual packet optical node can configure function chains for providing services based on calculation results of the proposed resource reallocation method.

• Access to Document (DOI)