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448 results on '"Awaji, Yoshinari"'

1. Real-time Transmission of Geometrically-shaped Signals using a Software-defined GPU-based Optical Receiver

Author

van der Heide, Sjoerd, Luis, Ruben S., Goossens, Sebastiaan, Puttnam, Benjamin J., Rademacher, Georg, Koonen, Ton, Shinada, Satoshi, Awaji, Yoshinari, Alvarado, Alex, Furukawa, Hideaki, and Okonkwo, Chigo

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

A software-defined optical receiver is implemented on an off-the-shelf commercial graphics processing unit (GPU). The receiver provides real-time signal processing functionality to process 1 GBaud minimum phase (MP) 4-, 8-, 16-, 32-, 64-, 128-ary quadrature amplitude modulation (QAM) as well as geometrically shaped (GS) 8- and 128-QAM signals using Kramers-Kronig (KK) coherent detection. Experimental validation of this receiver over a 91~km field-deployed optical fiber link between two Tokyo locations is shown with detailed optical signal-to-noise ratio (OSNR) investigations. A net data rate of 5 Gbps using 64-QAM is demonstrated., Comment: Accepted for publication at Optics Express

Published
2021
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2. Real-time, Software-Defined, GPU-Based Receiver Field Trial

Author

van der Heide, Sjoerd, Luis, Ruben S., Puttnam, Benjamin J., Rademacher, Georg, Koonen, Ton, Shinada, Satoshi, Awaji, Yoshinari, Okonkwo, Chigo, and Furukawa, Hideaki

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

We demonstrate stable real-time operation of a software-defined, GPU-based receiver over a metropolitan network. Massive parallelization is exploited for implementing direct-detection and coherent Kramers-Kronig detection in real time at 2 and 1 GBaud, respectively., Comment: Accepted for presentation at the European Conference on Optical Communications (ECOC) 2020

Published
2020
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3. Japanese National Projects on SDM Technologies

Author

Awaji, Yoshinari, Miyamoto, Yutaka, Miyazaki, Tetsuya, Morioka, Toshio, Morita, Itsuro, Nakajima, Kazuhide, Takara, Hidehiko, Tsuritani, Takehiro, Lotsch, H.K.V., Founding Editor, Rhodes, William T., Editor-in-Chief, Adibi, Ali, Series Editor, Asakura, Toshimitsu, Series Editor, Hänsch, Theodor W., Series Editor, Krausz, Ferenc, Series Editor, Masters, Barry R., Series Editor, Midorikawa, Katsumi, Series Editor, Venghaus, Herbert, Series Editor, Weber, Horst, Series Editor, Weinfurter, Harald, Series Editor, Kobayashi, Kazuya, Series Editor, Markel, Vadim, Series Editor, Nakazawa, Masataka, editor, Suzuki, Masatoshi, editor, Awaji, Yoshinari, editor, and Morioka, Toshio, editor

Published
2022
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4. Optical Transmission Technologies

Author

Morita, Itsuro, Hirooka, Toshihiko, Takara, Hidehiko, Awaji, Yoshinari, Fukuchi, Kiyoshi, Igarashi, Koji, Koga, Masafumi, Miyamoto, Yutaka, Mizuno, Takayuki, Nakazawa, Masataka, Puttnam, Benjamin J., Sakaguchi, Jun, Sano, Akihide, Tsuritani, Takehiro, Yamashita, Shinji, Lotsch, H.K.V., Founding Editor, Rhodes, William T., Editor-in-Chief, Adibi, Ali, Series Editor, Asakura, Toshimitsu, Series Editor, Hänsch, Theodor W., Series Editor, Krausz, Ferenc, Series Editor, Masters, Barry R., Series Editor, Midorikawa, Katsumi, Series Editor, Venghaus, Herbert, Series Editor, Weber, Horst, Series Editor, Weinfurter, Harald, Series Editor, Kobayashi, Kazuya, Series Editor, Markel, Vadim, Series Editor, Nakazawa, Masataka, editor, Suzuki, Masatoshi, editor, Awaji, Yoshinari, editor, and Morioka, Toshio, editor

Published
2022
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5. Introduction

Author

Morioka, Toshio, Awaji, Yoshinari, Enami, Kazumasa, Miyamoto, Yutaka, Morita, Itsuro, Okumura, Yukihiko, Suzuki, Masatoshi, Takara, Hidehiko, Terada, Jun, Yamamoto, Kenji, Lotsch, H.K.V., Founding Editor, Rhodes, William T., Editor-in-Chief, Adibi, Ali, Series Editor, Asakura, Toshimitsu, Series Editor, Hänsch, Theodor W., Series Editor, Krausz, Ferenc, Series Editor, Masters, Barry R., Series Editor, Midorikawa, Katsumi, Series Editor, Venghaus, Herbert, Series Editor, Weber, Horst, Series Editor, Weinfurter, Harald, Series Editor, Kobayashi, Kazuya, Series Editor, Markel, Vadim, Series Editor, Nakazawa, Masataka, editor, Suzuki, Masatoshi, editor, Awaji, Yoshinari, editor, and Morioka, Toshio, editor

Published
2022
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6. Inter-Core Crosstalk Impact of Classical Channels on CV-QKD in Multicore Fiber Transmission

Author

Eriksson, Tobias A., Puttnam, Benjamin J., Rademacher, Georg, Luis, Ruben S., Takeoka, Masahiro, Awaji, Yoshinari, Sasaki, Masahide, and Wada, Naoya

Subjects
Quantum Physics
Abstract

Crosstalk-induced excess noise is experimentally characterized for continuous-variable quantum key distribution, spatially multiplexed with WDM PM-16QAM channels in a 19-core fiber. The measured noise-sources are used to estimate the secret key rates for different wavelength channels., Comment: Optical Fiber Communication Conference (OFC), 2019, paper Th1J.1

Published
2019

8. A Novel Carrier-Cooperation Scheme with an Incentive for Offering Emergency Lightpath Support in Disaster Recovery

Author

Xu, Sugang, Yoshikane, Noboru, Miyata, Naoki, Shiraiwa, Masaki, Tsuritani, Takehiro, Zhang, Xiaocheng, Awaji, Yoshinari, Wada, Naoya, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Tzanakaki, Anna, editor, Varvarigos, Manos, editor, Muñoz, Raul, editor, Nejabati, Reza, editor, Yoshikane, Noboru, editor, Anastasopoulos, Markos, editor, and Marquez-Barja, Johann, editor

Published
2020
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18. Enhancement of Network-Cloud Ecosystem Resilience with Openness Disaggregation and Cooperation [Invited]

Author

Xu, Sugang, primary, Ishii, Kiyo, additional, Yoshikane, Noboru, additional, Sahoo, Subhadeep, additional, Ferdousi, Sifat, additional, Shiraiwa, Masaki, additional, Hirota, Yusuke, additional, Tsuritani, Takehiro, additional, Tornatore, Massimo, additional, Awaji, Yoshinari, additional, Namiki, Shu, additional, and Mukherjee, Biswanath, additional

Published
2023
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23. Impact of Transient Response of Erbium-Doped Fiber Amplifier for OPS/WDM and Its Mitigation

Author

Awaji, Yoshinari, Furukawa, Hideaki, Wada, Naoya, Kong, Eddie, Chan, Peter, Man, Ray, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Rangan, C. Pandu, editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Tomkos, Ioannis, editor, Neri, Fabio, editor, Solé Pareta, Josep, editor, Masip Bruin, Xavier, editor, and Sánchez Lopez, Sergi, editor

Published
2007
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24. Scheme of carrier cooperation with coordinated scheduling for faster and lower-cost failure/disaster recovery

Author

Xu, Sugang, Sahoo, Subhadeep, Ferdousi, Sifat, Yoshikane, Noboru, Shiraiwa, Masaki, Hirota, Yusuke, Tornatore, Massimo, Tsuritani, Takehiro, Awaji, Yoshinari, and Mukherjee, Biswanath

Abstract

Large-scale carrier networks are fundamental ICT infrastructures that support future 5G/6G services, and their resilience is a primary societal concern. Differently from single-carrier networks (in which one carrier owns multiple networks), in multi-carrier network ecosystems (in which the networks in the fields are operated by different carriers), cooperation among such different carriers is crucial to achieve resilience against large-scale failures. However, such cooperation is challenging since carriers may not disclose confidential information, e.g., detailed resource availability. In this study, we investigate how to perform carrier cooperative recovery in the case of large-scale failures/disasters. We propose two-stage carrier-carrier cooperative recovery planning by incorporating a coordinated scheduling for faster recovery. Through numerical evaluation, we confirm the potential benefit of carrier cooperation in terms of both recovery time and recovery cost reduction.

Published
2024
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25. Resilience enhancement in open network–cloud ecosystems through disaggregation and cooperation [Invited]

Author

Xu, Sugang, Ishii, Kiyo, Yoshikane, Noboru, Sahoo, Subhadeep, Ferdousi, Sifat, Shiraiwa, Masaki, Hirota, Yusuke, Tsuritani, Takehiro, Tornatore, Massimo, Awaji, Yoshinari, Namiki, Shu, and Mukherjee, Biswanath

Abstract

To accommodate the growing demand for cloud services, telecom carriers’ networks and datacenter (DC) facilities form large network–cloud ecosystems (ecosystems for short) physically supporting these services. These large-scale ecosystems are continuously evolving and must be highly resilient to support critical services. Open and disaggregated optical-networking technologies promise to enhance the interoperability across telecom carriers and DC operators, thanks to their open interfaces in both the data plane and control/management plane. In the first part of this paper, we focus on a single entity (e.g., a telecom carrier or an emerging telecom/DC partnership company) that owns both the network and DC infrastructures in the ecosystem. We introduce a solution by leveraging open and disaggregated technologies to enhance the resilience of the optical networks within a multi-vendor and multi-domain ecosystem. In the second part of this paper, we consider the case when the networks and DCs are owned by different entities. Also, in this case, cooperation among datacenter providers (DCPs) and carriers is crucial to provide failure/disaster resilience to today’s cloud services. However, such cooperation is more challenging since DCPs and carriers, being different entities, may not disclose confidential information, e.g., detailed resource availability. Hence, we introduce a solution to enhance the resilience of such multi-entity ecosystems through cooperation between DCPs and carriers without violating confidentiality.

Published
2024
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34. Real-time transmission of geometrically-shaped signals using a software-defined GPU-based optical receiver

Author

van der Heide, Sjoerd, Luis, Ruben S., Goossens, Sebastiaan, Puttnam, Benjamin J., Rademacher, Georg, Koonen, Ton, Shinada, Satoshi, Awaji, Yoshinari, Alvarado, Alex, Furukawa, Hideaki, Okonkwo, Chigo, van der Heide, Sjoerd, Luis, Ruben S., Goossens, Sebastiaan, Puttnam, Benjamin J., Rademacher, Georg, Koonen, Ton, Shinada, Satoshi, Awaji, Yoshinari, Alvarado, Alex, Furukawa, Hideaki, and Okonkwo, Chigo

Abstract

A software-defined optical receiver is implemented on an off-the-shelf commercial graphics processing unit (GPU). The receiver provides real-time signal processing functionality to process 1 GBaud minimum phase (MP) 4-, 8-, 16-, 32-, 64-, 128-ary quadrature amplitude modulation (QAM) as well as geometrically shaped (GS) 8- and 128-QAM signals using Kramers-Kronig (KK) coherent detection. Experimental validation of this receiver over a 91 km field-deployed optical fiber link between two Tokyo locations is shown with detailed optical signal-to-noise ratio (OSNR) investigations. A net data rate of 5 Gbps using 64-QAM is demonstrated.

Published
2022

35. A Comparative Study of Few-Mode Fiber and Coupled-Core Multi-Core Fiber Transmission

Author

Rademacher, Georg, Luis, Ruben S., Puttnam, Ben, Ryf, Roland, van der Heide, Sjoerd, Eriksson, Tobias A., Fontaine, Nicolas Keith, Chen, Haoshuo, Essiambre, Rene Jean, Awaji, Yoshinari, Furukawa, Hideaki, Rademacher, Georg, Luis, Ruben S., Puttnam, Ben, Ryf, Roland, van der Heide, Sjoerd, Eriksson, Tobias A., Fontaine, Nicolas Keith, Chen, Haoshuo, Essiambre, Rene Jean, Awaji, Yoshinari, and Furukawa, Hideaki

Abstract

Few-mode fibers and coupled-core multi-core fibers are attractive transmission media for space-division multiplexed transmission systems as they enable a high spatial channel multiplicity whilst sustaining the current standard cladding diameter. This paper compares space-division multiplexed recirculating loop transmission using either a 3-mode few-mode fiber or a 3-core coupled-core multi-core fiber. After analyzing the spectral attenuation properties of both fibers, we investigate the wavelength and transmission distance dependence of the transmission channel characteristics. We find that the channel memory length is shorter and mode-dependent loss is lower in the coupled-core multi-core fiber, which can be attributed to the fundamental mode-structure differences between the two fiber types. This leads to a higher data rate at similar transmission distance for the coupled-core multi-core fiber.

Published
2022

42. Datacenter-Carrier Cooperation over Optical Networks during Disaster Recovery

Author

Sahoo, Subhadeep, Sugang, Xu, Ferdousi, Sifat, Hirota, Yusuke, Tornatore, Massimo, Awaji, Yoshinari, and Mukherjee, Biswanath

Abstract

A novel cooperation strategy among DC service provider and carriers (operating optical networks) is proposed for disaster recovery. This cooperation improves service restoration by 70% w.r.t. benchmark methods for typical scenarios, with reduced cost.

Published
2022
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