Prof. Wakao Sasaki Profile

Prof. Wakao Sasaki

Professor of Electronics & Electrical Engineering at Doshisha Univ

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Author

Publications (30)

Proceedings Article | 29 September 2016 Paper

A smart grid technology for electrical power transmission lines by a self-organized optical network using LED

Shun Nakata, Yoshiki Mukoda, Wakao Sasaki

Proceedings Volume 9948, 99481E (2016) https://doi.org/10.1117/12.2238481

KEYWORDS: Optical networks, Light emitting diodes, Systems modeling, Optical communications, Photonics, Sustainable technology, Power supplies, Instrument modeling, Control systems, Photovoltaics

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We have demonstrated a new smart grid model by our novel green photonics technology based on self-organized optical networks realizing an autonomous peer-to-peer electric power transmissions without centralized control for the power grid. In this optical network, we introduced an adaptive algorithm for concurrent peer-to-peer communications, with a simple optical-electrical hybrid bistable circuit composed of such as light emitting diode (LED) and photo diode (PD) by utilizing optical nonlinearity depending only on the signal strength passing through the network. In the experiment, the method uses a simple, local adaptation of transmission weights at each network node, which we call a power gate unit (PGU) that enables self-organizing functions of the network. Based on this method, we have demonstrated experimentally a new smart grid model applicable for ad-hoc electric power distribution systems mediated power consumptions. In this model, electric power flow is controlled autonomously through the self-organized network nodes associated with individual power facilities having photovoltaics and electric storage devices, etc., and the nodes convert the amounts of electric power supply and/or consumption to the light intensity values using above mentioned transmission weights at each node. As a consequence, we have experimentally demonstrated a simple short haul system model for ad-hoc electric power distribution with a self-organized optical network as a novel green photonics technology application for smart grid consumptions. In this model, electric power flow is controlled autonomously through the selforganized network nodes associated with individual power facilities having photovoltaics and electric storage devices, etc., and the nodes convert the amounts of electric power supply and/or consumption to the light intensity values using above mentioned transmission weights at each node. As a consequence, we have experimentally demonstrated a simple short haul system model for ad-hoc electric power distribution with a self-organized optical network as a novel green photonics technology application for smart grid.

Proceedings Article | 29 September 2016 Paper

Optical chaos generation and frequency pulling effects through external input signal in nonlinear delayed feedback system using VICSEL

Junichi Shinde, Wakao Sasaki

Proceedings Volume 9948, 99481D (2016) https://doi.org/10.1117/12.2238460

KEYWORDS: Vertical cavity surface emitting lasers, Complex systems, Signal processing, Chaos, Nonlinear optics, Electro optics, Electro optical systems, Scientific research, Electronics, Chaos theory

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Proceedings Article | 19 September 2014 Paper

Optical chaos synchronization and encrypted communications of VCSEL by direct optical injection

Naohito Hosomi, Wakao Sasaki

Proceedings Volume 9216, 92160P (2014) https://doi.org/10.1117/12.2060689

KEYWORDS: Chaos, Vertical cavity surface emitting lasers, Complex systems, Telecommunications, Optical communications, Electro optics, Semiconductor lasers, Nonlinear optics, Electro optical systems, Nonlinear control

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Proceedings Article | 27 February 2014 Paper

Chaos synchronization and encrypted communication systems as an application of VCSELs

Masanori Hisatomi, Wakao Sasaki

Proceedings Volume 9001, 90010K (2014) https://doi.org/10.1117/12.2038970

KEYWORDS: Chaos, Vertical cavity surface emitting lasers, Telecommunications, Complex systems, Electro optical systems, Electro optics, Semiconductor lasers, Quality systems, Phase modulation, Scientific research

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Proceedings Article | 1 February 2014 Paper

Green photonics realized by optical complex systems

Hiroto Nanri, Wakao Sasaki

Proceedings Volume 9008, 90080B (2014) https://doi.org/10.1117/12.2039047

KEYWORDS: Nonlinear optics, Power supplies, Electro optical modeling, Photonics, Complex systems, Control systems, Optical networks, Light emitting diodes, Photovoltaics, Instrument modeling

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Proceedings Article | 18 December 2012 Paper

Effective speckle noise reduction of laser projection displays by high frequency driving current superposition for blue, red, and direct green emission laser diode

Yoshifumi Kouno, Kouhei Kamata, Kenta Chihaya, Wakao Sasaki, Hiroki Matsubara, Atsuya Hirano, Kenji Nagashima

Proceedings Volume 8550, 85501I (2012) https://doi.org/10.1117/12.981343

KEYWORDS: Semiconductor lasers, Denoising, Speckle, Superposition, Laser based displays, Modulation, Projection systems, RGB color model, Microelectromechanical systems, CCD cameras

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Proceedings Article | 19 February 2011 Paper

Hyper coherent linewidth control for a 30mW 405nm visible laser diode by delayed self-heterodyne beat

Masahiro Matsumura, Toshiki Kuromori, Wakao Sasaki

Proceedings Volume 7913, 79131C (2011) https://doi.org/10.1117/12.874148

KEYWORDS: Semiconductor lasers, Laser stabilization, Signal detection, Heterodyning, Light sources, Fabry–Perot interferometers, Feedback signals, Optical fibers, Digital holography, Modulation

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Proceedings Article | 2 February 2011 Paper

A new technique for speckle noise reduction of laser projection displays using waveplates

Tomoaki Yoshimi, Kenta Chihaya, Wakao Sasaki, Hiroki Matsubara, Atsuya Hirano, Kenji Nagashima

Proceedings Volume 7956, 79560V (2011) https://doi.org/10.1117/12.874039

KEYWORDS: Speckle, Denoising, Wave plates, Projection systems, Laser based displays, Polarization, Lenses, CCD cameras, Laser countermeasures, Laser sources

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Proceedings Article | 25 January 2011 Paper

A novel approach to smart grid technology for electrical power transmission lines by a self-organized optical network node based on optical bistability

Soichiro Nakanishi, Wakao Sasaki

Proceedings Volume 7959, 79590P (2011) https://doi.org/10.1117/12.874574

KEYWORDS: Optical networks, Systems modeling, Photonics, Light emitting diodes, Sustainable technology, Nonlinear optics, Adaptive optics, Photovoltaics, Optical components, Bistability

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Proceedings Article | 24 August 2010 Paper

Linewidth control for optical heterodyne beat of 850-nm vertical cavity surface emitting lasers

Akifumi Konishi, Takao Ohara, Wakao Sasaki

Proceedings Volume 7767, 77670U (2010) https://doi.org/10.1117/12.860052

KEYWORDS: Vertical cavity surface emitting lasers, Laser stabilization, Heterodyning, Signal detection, Resonators, Fabry–Perot interferometers, Negative feedback, Light sources, Modulation, Semiconductor lasers

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Proceedings Article | 26 February 2010 Paper

Precise frequency stabilization technique for 850nm vertical cavity surface emitting lasers by controlling their optical beat frequency

Takao Ohhara, Tomoaki Yoshimi, Wakao Sasaki

Proceedings Volume 7597, 759724 (2010) https://doi.org/10.1117/12.842770

KEYWORDS: Vertical cavity surface emitting lasers, Laser stabilization, Signal detection, Resonators, Light sources, Polarization, Negative feedback, Modulation, Semiconductor lasers, Mirrors

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Proceedings Article | 26 February 2010 Paper

Linewidth reduction of a 30mW-405nm GaN violet laser diode by optical-electrical double feedback method

Kouki Mizutani, Toshiki Kuromori, Wakao Sasaki

Proceedings Volume 7597, 759725 (2010) https://doi.org/10.1117/12.843006

KEYWORDS: Semiconductor lasers, Laser stabilization, Signal detection, Laser optics, Gallium nitride, Digital holography, Light sources, Holograms, Geometrical optics, Modulation

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Proceedings Article | 12 September 2007 Paper

A compact and efficient hyper coherent light source of visible violet laser diode based on Pound-Drever-Hall technique

Wakao Sasaki, Hideyuki Yashiro, Yukio Miura, Kouki Mizutani, Jun Nakajima

Proceedings Volume 6673, 66730Q (2007) https://doi.org/10.1117/12.733909

KEYWORDS: Semiconductor lasers, Laser stabilization, Signal detection, Light sources, Frequency modulation, Fermium, Digital holography, Computing systems, Control systems, Geometrical optics

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Proceedings Article | 12 September 2007 Paper

Compact and inexpensive frequency stabilization technique for 850-nm vertical cavity surface emitting lasers based on Fabry-Perot resonator

Yukio Miura, Jun Nakajima, Kouki Mizutani, Wakao Sasaki

Proceedings Volume 6673, 66730T (2007) https://doi.org/10.1117/12.735129

KEYWORDS: Vertical cavity surface emitting lasers, Laser stabilization, Resonators, Signal detection, Light sources, Polarization, Mirrors, Semiconductor lasers, Modulation, Feedback signals

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Proceedings Article | 6 March 2007 Paper

Nonblocking photonic switching for P2P self-organized optical concurrent communications network using pseudo-random numbers

Naoki Oshima, Yusuke Nozaki, Wakao Sasaki

Proceedings Volume 6482, 648210 (2007) https://doi.org/10.1117/12.699321

KEYWORDS: Switching, Circuit switching, Optical communications, Optical networks, Adaptive optics, Amplitude modulation, Signal detection, Optoelectronics, Wave propagation, Optical components

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Proceedings Article | 13 October 2006 Paper

Analysis of noise properties in a violet laser diode and its frequency stabilization based on Fabry-Perot resonators

Hideyuki Yashiro, Yukio Miura, Hidenori Tsuboi, Wakao Sasaki

Proceedings Volume 6368, 63680Z (2006) https://doi.org/10.1117/12.685164

KEYWORDS: Laser stabilization, Polarization, Semiconductor lasers, Signal detection, Spectrum analysis, Digital holography, Fabry–Perot interferometers, Mirrors, Holograms, Resonators

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Proceedings Article | 21 March 2006 Paper

Optoelectronic hybrid components for optical concurrent communications in peer-to-peer self-organizing network

Toshiki Onishi, Yusuke Nozaki, Wakao Sasaki

Proceedings Volume 6130, 61300K (2006) https://doi.org/10.1117/12.646261

KEYWORDS: Optical communications, Light emitting diodes, Optical circuits, Optical components, Signal attenuation, Signal detection, Modulation, Optoelectronics, Nonlinear optics, Adaptive optics

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Proceedings Article | 23 February 2006 Paper

Noise reduction of violet laser diodes by selection of feedback light polarization

Hironobu Konishi, Hideyuki Yashiro, Katsuya Takegami, Wakao Sasaki, Atsushi Ikeda, Yuuichi Kamioka, Kenji Nagashima

Proceedings Volume 6101, 61010Z (2006) https://doi.org/10.1117/12.645676

KEYWORDS: Polarization, Superposition, Denoising, Semiconductor lasers, Optical discs, Mirrors, Spectrum analysis, Temperature metrology, Optical testing, Gallium nitride

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Proceedings Article | 10 September 2005 Paper

A new architecture of self-organizing network for optical peer-to-peer communications

Toshiki Onishi, Wakao Sasaki

Proceedings Volume 5908, 590818 (2005) https://doi.org/10.1117/12.615923

KEYWORDS: Network architectures, Optical communications, Optical networks, Signal processing, Numerical simulations, Signal attenuation, Scattering, Computer architecture, Signal detection, Optical design

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Proceedings Article | 22 October 2004 Paper

An adaptive optical circuit with self-organizing link

Toshiki Onishi, Jun-ichi Morita, Wakao Sasaki

Proceedings Volume 5557, (2004) https://doi.org/10.1117/12.558718

KEYWORDS: Optical circuits, Light emitting diodes, Optical networks, Optical components, Integrated optics, Adaptive optics, Nonlinear optics, Telecommunications, Optical communications, Diodes

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Proceedings Article | 17 February 2003 Paper

Compact frequency stabilization system for a master laser diode in optical phase-locked loop using a single reference cavity for simultaneous application of optical feedback with Pound-Drever-Hall method

Shintaro Hisatake, Takahiro Kawamoto, Yoshihiro Kurokawa, Wakao Sasaki

Proceedings Volume 4833, (2003) https://doi.org/10.1117/12.474046

KEYWORDS: Laser stabilization, Signal detection, Heterodyning, Semiconductor lasers, Feedback loops, Interference (communication), Servomechanisms, Electronics, Laser optics, Light sources

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Proceedings Article | 17 May 2001 Paper

Linewidth reduction of a 30-mW 657-nm visible laser diode by optical-electrical double feedback method

Shintaro Hisatake, Masahrio Fukushima, Yoshihiro Kurokawa, Wakao Sasaki

Proceedings Volume 4285, (2001) https://doi.org/10.1117/12.426900

KEYWORDS: Laser stabilization, Semiconductor lasers, Fermium, Frequency modulation, Spectrum analysis, Servomechanisms, Digital signal processing, Signal processing, Optical amplifiers, Laser optics

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Proceedings Article | 29 November 2000 Paper

Controlling chaotic oscillation modes in visible semiconductor lasers by external light input and its applications to novel optical communications

Kouta Inagaki, Masato Fujita, Wakao Sasaki

Proceedings Volume 4114, (2000) https://doi.org/10.1117/12.408553

KEYWORDS: Semiconductor lasers, Complex systems, Chaos, Optical communications, Telecommunications, Nonlinear optics, Modulation, Linear filtering, Numerical analysis, Electro optics

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Proceedings Article | 21 April 2000 Paper

New technique for wavelength-division-multiplexing optical switching utilizing the mode-hopping phenomenon of semiconductor lasers in the visible wavelength region

Tomofumi Shiozaki, Masahrio Fukushima, Wakao Sasaki

Proceedings Volume 3949, (2000) https://doi.org/10.1117/12.382895

KEYWORDS: Semiconductor lasers, Modulation, Electro optics, Wavelength division multiplexing, Switching, Optical switching, Logic, Electronics, Signal detection, Optoelectronics

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Proceedings Article | 1 October 1999 Paper

Application of self-organized genetic algorithms to a novel color recognition system of optical neural network

Wakao Sasaki, Hiroyuki Uchida, Keishi Takahashi

Proceedings Volume 3804, (1999) https://doi.org/10.1117/12.363957

KEYWORDS: Neural networks, Genetic algorithms, LCDs, Semiconductor lasers, Laser optics, Liquid crystals, Laser damage threshold, RGB color model, Genetics, Projection systems

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Proceedings Article | 20 August 1999 Paper

Application of self-organized genetic algorithms to a novel color recognition system of all-optical neural networks

Wakao Sasaki, Hiroyuki Uchida, Keishi Takahashi

Proceedings Volume 3833, (1999) https://doi.org/10.1117/12.359517

KEYWORDS: Neural networks, Genetic algorithms, LCDs, Semiconductor lasers, Laser optics, Liquid crystals, Optics manufacturing, RGB color model, Genetics, Device simulation

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Proceedings Article | 5 November 1998 Paper

Chaotic lightwave generation by semiconductor lasers and its application to dynamical optical memories and novel optical communications

Wakao Sasaki, Kazuhiro Nakamuta

Proceedings Volume 3468, (1998) https://doi.org/10.1117/12.330427

KEYWORDS: Semiconductor lasers, Complex systems, Chaos, Optical communications, Linear filtering, Optical storage, Electro optical systems, Cryptography, Electro optics, Modulation

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Proceedings Article | 1 August 1990 Paper

Fast optical wavelength bistability under the mode-hopping phenomenon in semiconductor lasers

Wakao Sasaki, Hirokazu Nakayama, Masahiro Mitsuda, Tatehisa Ohta

Proceedings Volume 1280, (1990) https://doi.org/10.1117/12.20663

KEYWORDS: Semiconductor lasers, Switching, Bistability, Modulation, High speed photonics, Logic, Switches, Channel projecting optics, Electro optics, Statistical analysis

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Proceedings Article | 1 July 1990 Paper

New scheme of digital optical switching and memory operation utilizing the mode-hopping phenomenon in semiconductor lasers

Wakao Sasaki, Hirokazu Nakayama, Masahiro Mitsuda, Tatehisa Ohta

Proceedings Volume 1215, (1990) https://doi.org/10.1117/12.18074

KEYWORDS: Semiconductor lasers, Switching, Modulation, Bistability, Optical switching, Logic, Optical computing, Optical storage, Switches, Channel projecting optics

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Proceedings Article | 1 June 1990 Paper

Anomalous broadening spectra due to isotope effects in the high-power He-CdII white light lasers

Wakao Sasaki, Tatehisa Ohta

Proceedings Volume 1225, (1990) https://doi.org/10.1117/12.18500

KEYWORDS: Cadmium, High power lasers, Chemical species, Gas lasers, Modes of laser operation, Electronics, Hydrogen, Metals, Numerical simulations, Doppler effect

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Showing 5 of 30 publications

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