Prof. Hiroshi Hasegawa Profile

Prof. Hiroshi Hasegawa

at Nagoya Univ

SPIE Involvement:

Author

Publications (35)

Proceedings Article | 8 March 2024 Presentation + Paper

Robustness of digital subcarrier multiplexing systems to laser phase noise and chromatic dispersion

Kazato Satake, Ryuta Shiraki, Yojiro Mori, Hiroshi Hasegawa

Proceedings Volume 12894, 1289403 (2024) https://doi.org/10.1117/12.3002195

KEYWORDS: Dispersion, Multiplexing, Phase shift keying, Modulation, Digital signal processing, Simulations, Optical transmission, Interference (communication), Tolerancing, Receivers

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Proceedings Article | 15 March 2023 Presentation + Paper

Optical path management based on machine learning for optical networks

R. Shiraki, Y. Mori, H. Hasegawa

Proceedings Volume 12429, 124290M (2023) https://doi.org/10.1117/12.2649581

KEYWORDS: Digital signal processing, Optical networks, Optical amplifiers, Optical transmission, Modulation, Machine learning, Systems modeling, Wavelength division multiplexing, Optical filters

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Proceedings Article | 4 March 2022 Presentation + Paper

Measurement method of transmitter IQ imbalance in digital coherent communication systems

Naoki Tsuchida, Takuma Kuno, Yojiro Mori, Hiroshi Hasegawa

Proceedings Volume 12027, 1202708 (2022) https://doi.org/10.1117/12.2609376

KEYWORDS: Transmitters, Digital signal processing, Filtering (signal processing), Receivers, Optical filters, Modulation, Picosecond phenomena, Phase shift keying, Finite impulse response filters, Polarization

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Proceedings Article | 5 March 2021 Presentation + Paper

Evaluation of low-complexity digital coherent receivers for short-reach transmission systems

Takuma Kuno, Yojiro Mori, Hiroshi Hasegawa

Proceedings Volume 11712, 117120C (2021) https://doi.org/10.1117/12.2577542

KEYWORDS: Digital signal processing, Receivers, Quadrature amplitude modulation, Finite impulse response filters, Transmitters, Phase shift keying, Device simulation, Demodulation, Clouds

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Proceedings Article | 31 January 2020 Paper

Quasi-Nyquist WDM networks using receiver-side quadrature duo-binary/quaternary spectrum shaping

Kazuya Okamura, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 11308, 113080E (2020) https://doi.org/10.1117/12.2544195

KEYWORDS: Digital filtering, Wavelength division multiplexing, Wavelength division multiplexing networks, Receivers, Signal to noise ratio, Optical filters, Signal processing, Optical networks

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Proceedings Article | 31 January 2020 Paper

Highly spectrally efficient metro networks that adopt fiber-level granular routing on overlaid line-/ring-shaped virtual topologies

Ryuta Shiraki, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Paolo Monti

Proceedings Volume 11308, 1130809 (2020) https://doi.org/10.1117/12.2545553

KEYWORDS: Optical fibers, Wavelength division multiplexing, Network architectures, Switches, Dense wavelength division multiplexing, Wavelength division multiplexing networks, Numerical simulations, Optical filters, Receivers, Modulation

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Proceedings Article | 1 February 2019 Presentation + Paper

Novel network architecture enabling quasi-Nyquist wavelength-division multiplexing

Ryuta Shiraki, Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 10946, 109460C (2019) https://doi.org/10.1117/12.2507449

KEYWORDS: Wavelength division multiplexing, Signal processing, Network architectures, Wavelength division multiplexing networks, Computer simulations, Optical filters, Continuous wave operation, Tunable lasers

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Proceedings Article | 30 January 2018 Paper

Demonstration of 153.6-Tbps throughput from 1,536x1,536 optical switch with uniform-loss and cyclic-frequency AWGs

Hiroki Nagai, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 10560, 105600P (2018) https://doi.org/10.1117/12.2288268

KEYWORDS: Switches, Optical switching, Optical amplifiers, Signal attenuation, Transmitters, Photonic integrated circuits, Modulation, Modulators, Switching, Signal detection

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Proceedings Article | 30 January 2018 Paper

Large-scale optical node architecture enabling spectral-efficiency maximization in ultra-dense WDM networks

Shuhei Yamaoka, Ryota Hashimoto, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 10560, 105600G (2018) https://doi.org/10.1117/12.2288270

KEYWORDS: Signal attenuation, Modulation, Wavelength division multiplexing networks, Wavelength division multiplexing, Single mode fibers, Optical amplifiers, Optical filters, Computer simulations, Forward error correction, Switches

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Proceedings Article | 28 January 2017 Paper

Impairment mitigation in noncoherent optical transmission enabled with machine learning for intra-datacenter networks

Keisuke Ito, Masaki Niwa, Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 10131, 101310A (2017) https://doi.org/10.1117/12.2253456

KEYWORDS: Dispersion, Machine learning, Modulation, Impairment mitigation, Transmittance, Tolerancing, Optical fibers, Digital signal processing, Signal detection, Receivers

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Proceedings Article | 28 January 2017 Paper

Network expansion strategy for elastic optical networks that considers channel capacity upgrades

Takuma Yasuda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 10129, 1012909 (2017) https://doi.org/10.1117/12.2250489

KEYWORDS: Algorithm development, Optical networks, Optical fibers, Network architectures, Channel projecting optics, Modulation, Transponders, Orthogonal frequency division multiplexing, Electrical engineering, Computer science

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Proceedings Article | 7 March 2016 Paper

Demonstration of 720x720 optical fast circuit switch for intra-datacenter networks

Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Hiroyuki Matsuura, Kiyo Ishii, Haruhiko Kuwatsuka, Shu Namiki, Ken-ichi Sato

Proceedings Volume 9775, 97750J (2016) https://doi.org/10.1117/12.2211998

KEYWORDS: Optical switching, Switches, Switching, Integrated optics, Optical circuits, Optical amplifiers, Laser development, Network architectures, Circuit switching, Optical networks, Tunable lasers, Fiber amplifiers, Signal attenuation

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Proceedings Article | 13 February 2016 Paper

Architecture and design of optical path networks utilizing waveband virtual links

Yusaku Ito, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 9773, 97730J (2016) https://doi.org/10.1117/12.2209466

KEYWORDS: Network architectures, Optical networks, Optical design, Optical network architecture, Switching, Channel projecting optics, Optical filters, Stereolithography, Modulation, Computer architecture

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Proceedings Article | 13 February 2016 Paper

Real-time optical path control method that utilizes multiple support vector machines for traffic prediction

Hiroshi Kawase, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 9773, 97730I (2016) https://doi.org/10.1117/12.2209463

KEYWORDS: Machine learning, Optical communications, Optical networks, Data processing, Statistical analysis, Relays, Artificial neural networks, Current controlled current source, Explosives

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Proceedings Article | 7 February 2015 Paper

A novel optical path routing network that combines coarse granularity optical multicast with fine granularity add/drop and block

Mauro Soares, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 9388, 93880O (2015) https://doi.org/10.1117/12.2078561

KEYWORDS: Optical networks, Switches, Optical switching, Network architectures, Algorithm development, Singular optics, Photonic integrated circuits, Switching, Video, Electrical engineering

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Proceedings Article | 7 February 2015 Paper

Wavelength-tunable filter utilizing non-cyclic arrayed waveguide grating to create colorless, directionless, contentionless ROADMs

Masaki Niwa, Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio Watanabe

Proceedings Volume 9388, 938807 (2015) https://doi.org/10.1117/12.2078522

KEYWORDS: Tunable filters, Switches, Receivers, Channel projecting optics, Photonic integrated circuits, Optical filters, Signal attenuation, Prototyping, Photodetectors, Optical amplifiers

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Proceedings Article | 15 December 2011 Paper

Multi-domain path control system for large-scale photonic networks

Soichiro Araki, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 8310, 83100Z (2011) https://doi.org/10.1117/12.911838

KEYWORDS: Control systems, Algorithm development, Photonics systems, Optical networks, Computing systems, Visibility, Optimization (mathematics), Network architectures, Time metrology, Broadband telecommunications

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Proceedings Article | 15 December 2011 Paper

Design algorithm of waveband multicast tree in hierarchical optical path networks that utilizes grouping of destination node sets

Yusuke Hachisuka, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 8310, 831003 (2011) https://doi.org/10.1117/12.904298

KEYWORDS: Optical networks, Switches, Optical switching, Networks, Singular optics, Algorithm development, Network architectures, Optical design, Video, Channel projecting optics

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Proceedings Article | 15 December 2011 Paper

Design of hierarchical optical path networks that utilize wavelength conversion and evaluation of the allowable cost bound

Zhi-shu Shen, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 8310, 831007 (2011) https://doi.org/10.1117/12.904111

KEYWORDS: Optical networks, Singular optics, Optical design, Network architectures, Algorithm development, Interfaces, Stereolithography, Optimization (mathematics), Fiber to the x, Internet

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Proceedings Article | 18 February 2011 Paper

Ring connecting node architecture employing variable filter

Takaaki Oono, Kiyo Ishii, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7988, 79880D (2011) https://doi.org/10.1117/12.888422

KEYWORDS: Prototyping, Switches, Optical fibers, Computer architecture, Electronic filtering, Liquid crystal on silicon, Multiplexers, Digital Light Processing, Telecommunications, Photonics

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Proceedings Article | 18 February 2011 Paper

Switch scale evaluation for optical cross-connects considering add/drop ratio restriction

Ryosuke Hirako, Kiyo Ishii, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7988, 79880C (2011) https://doi.org/10.1117/12.888598

KEYWORDS: Switches, Algorithm development, Network architectures, Optical networks, Singular optics, Optical fibers, Telecommunications, Optical design, Electrical engineering, Computer science

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Proceedings Article | 25 January 2011 Paper

PCE-based scalable dynamic path control for large-scale photonic networks

Soichiro Araki, Kohei Shimada, Hiroshi Hasegawa, Ken-ichi Sato, Yohei Iizawa, Shinya Ishida, Itaru Nishioka

Proceedings Volume 7959, 79590I (2011) https://doi.org/10.1117/12.875176

KEYWORDS: Control systems, Algorithm development, Optical networks, Computing systems, Optimization (mathematics), Time metrology, Visibility, Broadband telecommunications, Fiber to the x, Standards development

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Proceedings Article | 11 January 2011 Paper

A dynamic path control method applying traffic-prediction-based route pre-prioritization

Hiroaki Ohno, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7989, 79890I (2011) https://doi.org/10.1117/12.888424

KEYWORDS: Optical networks, Circuit switching, Algorithm development, Failure analysis, Electrical engineering, Computer science, Video, Network architectures, Current controlled current source, Computer programming

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Proceedings Article | 11 January 2011 Paper

Hybrid hierarchical optical path network design algorithm with 2-stage ILP optimization

Hai-Chau Le, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7989, 798902 (2011) https://doi.org/10.1117/12.888420

KEYWORDS: Optical networks, Network architectures, Hybrid optics, Switches, Optimization (mathematics), Singular optics, Optical design, Optical switching, Switching, Algorithm development

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Proceedings Article | 19 November 2009 Paper

A dynamic routing algorithm for multi-domain photonic networks using averaged link load information

Kohei Shimada, Soichiro Araki, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7633, 76331F (2009) https://doi.org/10.1117/12.852153

KEYWORDS: Optical fibers, Electrical engineering, Computer science, Optical computing, Broadband telecommunications, Switching, Standards development, Optimization (mathematics), Network architectures, Current controlled current source

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Proceedings Article | 19 November 2009 Paper

Evaluations of physical and optical path level hierarchical networks to implement optical fast circuit switching

Takahiro Ogawa, Yoshiyuki Yamada, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7633, 76330B (2009) https://doi.org/10.1117/12.852134

KEYWORDS: Network architectures, Optical networks, Circuit switching, Optical switching, Switching, Televisions, Fast packet switching, Video, Singular optics, Structured optical fibers

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Proceedings Article | 19 November 2009 Paper

Impact of waveband capacity on protected hierarchical optical path networks

Yoshiyuki Yamada, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7633, 763302 (2009) https://doi.org/10.1117/12.852133

KEYWORDS: Optical networks, Network architectures, Algorithm development, Singular optics, Switches, Optical design, Switching, Multiplexers, Explosives, Signal processing

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Proceedings Article | 19 November 2009 Paper

Impact of path granularity and operation interval on dynamic path network control

Hiroyuki Ito, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7633, 76330A (2009) https://doi.org/10.1117/12.852139

KEYWORDS: Internet, Linear filtering, Algorithm development, Electrical engineering, Computer science, Human-machine interfaces, Interfaces, Explosives, Optimization (mathematics), Standards development

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Proceedings Article | 19 November 2008 Paper

Optical path dynamic routing algorithm based on traffic prediction

Keita Obara, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 7137, 713724 (2008) https://doi.org/10.1117/12.803105

KEYWORDS: Optical networks, Internet, Switching, Time division multiplexing, Electrical engineering, Computer science, Video, Failure analysis, Network architectures, Current controlled current source

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Proceedings Article | 19 November 2007 Paper

An RWA algorithm for OBS networks based on iterative local optimization of total blocking probability

Tomohiro Yoshikawa, Hidetaka Nagashima, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 6783, 67831N (2007) https://doi.org/10.1117/12.745026

KEYWORDS: Optimization (mathematics), Switching, Photonic crystal fibers, Electrical engineering, Computer science, Video, Optical networks, Channel projecting optics, Crystals, Photonic crystals

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Proceedings Article | 2 October 2006 Paper

Optical switch architectures for hierarchical optical path networks

Shoji Kakehashi, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 6388, 638809 (2006) https://doi.org/10.1117/12.686816

KEYWORDS: Switches, Optical switching, Multiplexers, Network architectures, Optical networks, Stars, Optical components, Microelectromechanical systems, Fiber to the x, Wavelength division multiplexing

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Proceedings Article | 25 October 2005 Paper

Segmented network design and performance evaluation for large scale transparent OXC-based networks

Koshi Sugimura, Hiroshi Hasegawa, Ken-ichi Sato

Proceedings Volume 6012, 60120C (2005) https://doi.org/10.1117/12.631113

KEYWORDS: Network architectures, Optical networks, Optical amplifiers, Raman spectroscopy, Signal to noise ratio, Algorithm development, Fiber amplifiers, Wavelength division multiplexing, Broadband telecommunications, Optical fibers

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Proceedings Article | 10 January 2002 Paper

Experimental study of 28-GB optical disk using a blue laser

Hiroshi Hasegawa, Shintaro Takehara, Akihito Ogawa, Hideaki Ohsawa, Naomasa Nakamura, Keiichiro Yusu, Sumio Ashida

Proceedings Volume 4342, (2002) https://doi.org/10.1117/12.453377

KEYWORDS: Optical discs, Objectives, Semiconductor lasers, Signal processing, Monochromatic aberrations, Light sources, Digital video discs, Data storage, Head, Relays

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Proceedings Article | 8 September 1995 Paper

High-density mark position recording on a 90-mm phase-change optical disk

Hiromichi Kobori, Hiroshi Hasegawa, Toshihiro Sugaya, Naomasa Nakamura, Naoki Morishita, Tadashi Kobayashi, Katsumi Suzuki

Proceedings Volume 2514, (1995) https://doi.org/10.1117/12.218724

KEYWORDS: Optical discs, Optical design, Distortion, Semiconductor lasers, Image compression, Data storage, Image quality, Objectives, Gold, Absorption

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Proceedings Article | 12 October 1994 Paper

High-density recording for greater than 1-GByte capacity using a 90-mm phase-change optical disk

Hiromichi Kobori, Hiroshi Hasegawa, Toshihiro Sugaya, Naoki Morishita, Naomasa Nakamura, Katsumi Suzuki

Proceedings Volume 2338, (1994) https://doi.org/10.1117/12.190174

KEYWORDS: Optical discs, Optical design, Zinc, Gold, Reflectivity, Signal attenuation, Optical storage, Distortion, Edge detection, Semiconductor lasers

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Showing 5 of 35 publications

Conference Committee Involvement (1)

Network Architectures, Management, and Applications

13 November 2011 | Shanghai, China

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