Dr. Naoya Wada Profile

Dr. Naoya Wada

Senior Researcher at NICT

SPIE Involvement:

Author

Publications (39)

Proceedings Article | 11 March 2020 Paper

Duplex optical amplifier for 10 Gb/s ethernet link over 120 km SSMF and 15 km DCF

Vittavat Vorapamorn, Duang-rudee Worasucheep, Naoya Wada

Proceedings Volume 11331, 1133109 (2020) https://doi.org/10.1117/12.2553000

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This paper focuses on extending the maximum link distance between typical optical transceivers in mobile aggregation networks. Our duplex optical amplifier is inserted between base-stations in suburban or border areas, in order to amplify 10 Gigabit Ethernet data transmitted in C-band wavelength (1530 - 1565 nm). It consists of two Conventional Erbium- Doped Fiber Amplifiers (C-EDFAs), each for unidirectional transmission. It can support 4G Long-Term Evolution (LTE)/5G network application at 10 Gb/s and higher bit-rates. The measured parameters of duplex optical amplifier are operating wavelength range, amplifier gain, and noise figure (NF). Their operating ranges of both C-EDFAs are from 1530 nm to 1562 nm. Their maximum gains are approximately 24.5 dB at 0.2-Ampere pump current and 1550-nm input wavelength. Their NFs are below 6.3 dB at -3 dBm input power and 1550-nm input wavelength. In addition, we measured a Burst-Mode EDFA (BM-EDFA) to compare with C-EDFAs. The BM-EDFA’s operating range is from 1537 to 1561 nm. Its maximum gains are approximately 24.5 dB and 31 dB at pump current of 0.175 Ampere and 0.38 Ampere respectively. Its NF is below 6 dB at the same input power and wavelength as in C-EDFAs. From these parameter results, the characteristics of C-EDFA and BM-EDFA are likely the same. However, from 10 Gb/s data transmission experiment, BM-EDFA has the lowest power variation on Ethernet packets, compared to duplex C-EDFA and another commercial EDFA. Furthermore, the effects of EDFA noises and Chromatic Dispersion (CD) over a link’s performance has been investigated and shown by Bit Error Rate (BER) measurements. The Dispersion Compensation Fiber (DCF) and 1-nm Tunable Optical Band-Pass Filter (TOBPF) were added after C-EDFAs, to reduce CD and noises respectively. Finally, the data transmission over 120 Km Standard Single-Mode Fiber (SSMF) & 15 Km DCF by using duplex optical amplifier at 10 Gb/s bit-rate was achieved with 0.5-dB power penalty at 10^-9 BER. Moreover, we can identify that BM-EDFA is more suitable for Ethernet link than C-EDFAs. Hence, we propose that C-EDFAs in duplex optical amplifier should be replaced by BM-EDFA to improve the link performance.

Proceedings Article | 31 January 2020 Paper

Converged RoF-based mobile fronthaul and passive optical network with NOMA-CAP modulation format

Samael Sarmiento, José Manuel Delgado Mendinueta, José Antonio Altabás, Salvatore Spadaro, Satoshi Shinada, Hideaki Furukawa, Juan José Vegas Olmos, José Antonio Lázaro, Naoya Wada

Proceedings Volume 11307, 113070L (2020) https://doi.org/10.1117/12.2540766

KEYWORDS: Modulation, Digital signal processing, Receivers, Passive optical networks, Signal processing, Clouds, Signal detection, Modulators, Filtering (signal processing)

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Proceedings Article | 31 January 2020 Presentation + Paper

Spatial mode exchange technique using volume holograms with a random optical diffuser to reduce modal cross-talks

Shuanglu Zhang, Atsushi Okamoto, Taijun Shiba, Hotaka Hayashi, Kazuhisa Ogawa, Akihisa Tomita, Taketoshi Takahata, Satoshi Shinada, Yuta Goto, Naoya Wada

Proceedings Volume 11309, 1130909 (2020) https://doi.org/10.1117/12.2545600

KEYWORDS: Holograms, Volume holography, Diffusers, Multiplexing, Optical communications, Modulation, Digital micromirror devices, Holography, Numerical simulations, Telecommunications

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Proceedings Article | 31 January 2020 Presentation + Paper

Mode-selective switch for ROADM using volume holograms and spatial light modulator

Hotaka Hayashi, Atsushi Okamoto, Tomohiro Maeda, Taijun Shiba, Kazuhisa Ogawa, Akihisa Tomita, Taketoshi Takahata, Satoshi Shinada, Yuta Goto, Naoya Wada

Proceedings Volume 11309, 1130908 (2020) https://doi.org/10.1117/12.2544685

KEYWORDS: Switches, Holograms, Volume holography, Spatial light modulators, Signal to noise ratio, Multiplexing, Switching, Diffraction, Multiplexers, Single mode fibers

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Proceedings Article | 21 June 2019 Paper

Highly repetitive low-coherence interferometry with time-stretch technique

Masaharu Hoshikawa, Katsuhiro Ishii, Takeshi Makino, Takahiro Hashimoto, Hideaki Furukawa, Naoya Wada

Proceedings Volume 11056, 1105644 (2019) https://doi.org/10.1117/12.2525939

KEYWORDS: Pulsed laser operation, Interferometry, Oscilloscopes, Picosecond phenomena, Interferometers, Optical amplifiers, Fourier transforms, Fiber lasers, Semiconductor lasers

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Proceedings Article | 4 March 2019 Paper

Pulse-by-pulse single-shot optical spectrum analyzer developed on a single platform

Hideaki Furukawa, Takeshi Makino, Xiaomin Wang, Tetsuya Kobayashi, Bahram Jalali, Dale Capewell, Mohammad Asghari, Wai Sing Man, Kwong Shing Tsang, Naoya Wada

Proceedings Volume 10903, 109030E (2019) https://doi.org/10.1117/12.2510008

KEYWORDS: Optical fibers, Picosecond phenomena, Singular optics, Spectrum analysis, Spectral resolution, Modulators, Optical amplifiers, Fourier transforms, Optical modulators, Clocks

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Proceedings Article | 5 March 2018 Paper

Measurement of characteristic parameters of 10 Gb/s bidirectional optical amplifier for XG-PON

Suchaj Rakkammee, Budsara Boriboon, Duang-rudee Worasucheep, Naoya Wada

Proceedings Volume 10714, 107140I (2018) https://doi.org/10.1117/12.2299808

KEYWORDS: Optical amplifiers, Polarization, Signal attenuation, L band, Fiber amplifiers, Passive optical networks, Semiconductor optical amplifiers, Variable optical attenuators, Communication and information technologies, Optical networks

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Proceedings Article | 22 February 2018 Presentation + Paper

Characteristics-improvement of QD semiconductor optical amplifier using rapid-thermal annealing process

Budsara Boriboon, Duang-rudee Worasucheep, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Naoya Wada

Proceedings Volume 10528, 105280F (2018) https://doi.org/10.1117/12.2288608

KEYWORDS: Internal quantum efficiency, Quantum dots, Annealing, Semiconductor lasers, Semiconductor optical amplifiers, External quantum efficiency, Quantum optics, Optical amplifiers, Quantum dot lasers

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Proceedings Article | 15 February 2018 Paper

Time stretch dispersive Fourier transform based single-shot pulse-by-pulse spectrum measurement using a pulse-repetition-frequency-variable gain-switched laser

Hideaki Furukawa, Takeshi Makino, Xiaomin Wang, Tetsuya Kobayashi, Mohammad Asghari, Paul Trinh, Bahram Jalali, Wai Sing Man, Kwong Shing Tsang, Naoya Wada

Proceedings Volume 10517, 1051709 (2018) https://doi.org/10.1117/12.2289366

KEYWORDS: Picosecond phenomena, Optical testing, Oscilloscopes, Fourier transforms, Spectral resolution, Clocks, Pulsed laser operation, Semiconductors, Optics manufacturing, Semiconductor lasers, Spectrometers

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Proceedings Article | 14 February 2018 Paper

Spectral efficiency in crosstalk-impaired multi-core fiber links

Ruben Luís, Benjamin Puttnam, Georg Rademacher, Werner Klaus, Erik Agrell, Yoshinari Awaji, Naoya Wada

Proceedings Volume 10551, 1055102 (2018) https://doi.org/10.1117/12.2282822

KEYWORDS: Signal processing, Digital signal processing, Fiber characterization

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Proceedings Article | 29 January 2018 Presentation + Paper

High-capacity transmission with homogeneous multi-core fibers and wideband optical comb sources

B. Puttnam, R. Luís, G. Rademacher, J. Sakaguchi, Y. Awaji, N. Wada, J. Marciante, B. P. Kuo, S. Radic

Proceedings Volume 10561, 105610C (2018) https://doi.org/10.1117/12.2295673

KEYWORDS: Modulation, Optical fibers, Digital signal processing, Receivers, Transmitters, Optical amplifiers, Multiplexing, Signal processing, Phase shift keying, Modulators

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Proceedings Article | 22 February 2017 Paper

Billion frames per second spectrum measurement for high-repetition-rate optical pulses based on time stretching technique

Hideaki Furukawa, Takeshi Makino, Mohammad Asghari, Paul Trinh, Bahram Jalali, Xiaomin Wang, Tetsuya Kobayashi, Wai Man, Kwong Shing Tsang, Naoya Wada

Proceedings Volume 10089, 100890A (2017) https://doi.org/10.1117/12.2255873

KEYWORDS: Ultrafast phenomena, Oscilloscopes, Imaging spectroscopy, Picosecond phenomena, Dispersion, Time metrology, Femtosecond phenomena, Optical communications, Ultrafast laser spectroscopy, Ultrafast measurement systems, Spectral resolution, Fourier transforms, Nonlinear dynamics, Mode locking

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Proceedings Article | 7 February 2015 Paper

Ultra-stable optical amplifier technologies for dynamic optical switching networks

M. Shiraiwa, K. Tsang, R. Man, B. Puttnam, Y. Awaji, N. Wada

Proceedings Volume 9389, 93890D (2015) https://doi.org/10.1117/12.2079120

KEYWORDS: Optical amplifiers, Optical switching, Optical networks, Integrated optics, Wavelength division multiplexing, Signal attenuation, Tunable lasers, Data communications, Transceivers, Packet switching

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Proceedings Article | 7 February 2015 Paper

Coherent detection in self-homodyne systems with single and multi-core transmission

Ruben Luís, Benjamin Puttnam, José-Manuel Mendinueta, Ali Shahpari, Zoran Vujičić, Werner Klaus, Jun Sakaguchi, Yoshinari Awaji, Antonio Teixeira, Naoya Wada, Tetsuya Kawanishi, Atsushi Kanno

Proceedings Volume 9389, 93890P (2015) https://doi.org/10.1117/12.2081686

KEYWORDS: Receivers, Signal detection, Digital signal processing, Modulation, Optical amplifiers, Polarization, Modulators, Optical fibers, Signal to noise ratio, Interference (communication)

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Proceedings Article | 7 February 2015 Paper

Key technologies for energy and spectral efficient flexible optical networks

Satoshi Shimizu, Gabriella Cincotti, Naoya Wada

Proceedings Volume 9389, 938903 (2015) https://doi.org/10.1117/12.2079019

KEYWORDS: Channel projecting optics, Optical networks, Terahertz radiation, Digital signal processing, Orthogonal frequency division multiplexing, Multiplexing, Optical filters, Modulators, Signal generators, Data conversion

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Proceedings Article | 22 August 2014 Paper

Investigation of PPSLT waveguides for applications in optical communication systems

André Albuquerque, Benjamin Puttnam, Junji Hirohashi, Miguel Drummond, Satoshi Shinada, Rogério Nogueira, Naoya Wada

Proceedings Volume 9286, 92861K (2014) https://doi.org/10.1117/12.2063760

KEYWORDS: Waveguides, Second-harmonic generation, Manufacturing, Optical communications, Collimators, Telecommunications, Lithium, Lithium niobate, Photorefraction, Phase matching

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Proceedings Article | 1 February 2014 Paper

Hybrid MDM/OCDM system with mode and code multi-/demultiplexers

Takahiro Kodama, Tomoki Isoda, Koji Morita, Akihiro Maruta, Ryo Maruyama, Nobuo Kuwaki, Shoichiro Matsuo, Naoya Wada, Gabriella Cincotti, Ken-ichi Kitayama

Proceedings Volume 9009, 90090K (2014) https://doi.org/10.1117/12.2042617

KEYWORDS: Radon, Multiplexing, Single mode fibers, Tolerancing, Phase shift keying, Interference (communication), Terbium, Modulation, Free space optics, Photonic integrated circuits

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Proceedings Article | 7 November 2012 Paper

Superstructured FBG based optical encoder/decoder for highly-confidential 40 Gbps telecommunication network

Koji Omichi, Ryujiro Nomura, Ryosuke Matsumoto, Satoshi Shimizu, Yoshihiro Terada, Akira Sakamoto, Ryozo Yamauchi, Naoya Wada, Ken-ichi Kitayama

Proceedings Volume 8421, 842193 (2012) https://doi.org/10.1117/12.968477

KEYWORDS: Computer programming, Networks, Fiber Bragg gratings, Refractive index, Phase shifts, Picosecond phenomena, Phase shift keying, Modulation, Reflectivity, Code division multiplexing

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Proceedings Article | 26 July 2011 Paper

Integrated optics structures on sol-gel derived organic-inorganic hybrids for optical communications

P. André, C. M. S. Vicente, V. Fernandes, C. Marques, E. Pecoraro, R. Nogueira, N. Wada, L. Carlos, P. Marques, R. A. S. Ferreira

Proceedings Volume 8001, 800120 (2011) https://doi.org/10.1117/12.894538

KEYWORDS: Refractive index, Integrated optics, Optical filters, Sol-gels, Planar waveguides, Fiber Bragg gratings, Waveguides, Scanning electron microscopy, Dielectrics, Optical communications

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Proceedings Article | 18 February 2011 Paper

2D time domain spectral phase encoding/wavelength hopping coherent DPSK-OCDMA system using fiber Bragg gratings and phase modulator

Zhensen Gao, Bo Dai, Xu Wang, Nobuyuki Kataoka, Naoya Wada

Proceedings Volume 7988, 79880R (2011) https://doi.org/10.1117/12.887977

KEYWORDS: Spiral phase plates, Phase shift keying, Fiber Bragg gratings, Computer programming, Modulators, Phase modulation, Modulation, Telecommunications, Light sources, Signal generators

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Proceedings Article | 18 February 2011 Paper

Experimental investigation on security of temporal phase coding OCDMA system with code-shift keying and differential phase-shift keying

Bo Dai, Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya Wada

Proceedings Volume 7988, 79880M (2011) https://doi.org/10.1117/12.887713

KEYWORDS: Phase shift keying, Computer programming, Signal detection, Computer security, Eye, Information security, Modulators, Telecommunications, Demodulation, Modulation

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Proceedings Article | 18 February 2011 Paper

Ultrafast optical pulse repetition rate multiplication based on time domain spectral amplitude/phase filtering

Zhensen Gao, Bo Dai, Xu Wang, Nobuyuki Kataoka, Naoya Wada

Proceedings Volume 7988, 79881T (2011) https://doi.org/10.1117/12.887979

KEYWORDS: Optical filters, Modulators, Ultrafast phenomena, Optical fibers, Filtering (signal processing), Single mode fibers, Mode locking, Integrated optics, Telecommunications, Modulation

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Proceedings Article | 19 January 2011 Paper

Experimental demonstration of ±π/2-phase-shifted SSFBG encoder for security improvement in time-spreading OCDMA

Bo Dai, Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya Wada

Proceedings Volume 7986, 798607 (2011) https://doi.org/10.1117/12.887741

KEYWORDS: Computer programming, Phase shifts, Picosecond phenomena, Information security, Modulation, Network security, Fiber Bragg gratings, Single mode fibers, Communication engineering, Physical sciences

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Proceedings Article | 26 November 2007 Paper

Hybrid WDM/OCDMA for next generation access network

Xu Wang, Naoya Wada, T. Miyazaki, G. Cincotti, Ken-ichi Kitayama

Proceedings Volume 6783, 678328 (2007) https://doi.org/10.1117/12.745673

KEYWORDS: Wavelength division multiplexing, Picosecond phenomena, Computer programming, Forward error correction, Modulation, Fiber Bragg gratings, Polarization, Phase shift keying, Multiplexing, Phase shifts

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Proceedings Article | 19 November 2007 Paper

160Gbps all-optical packet switch demonstrator

Naoya Wada

Proceedings Volume 6783, 67831C (2007) https://doi.org/10.1117/12.742544

KEYWORDS: Switches, Receivers, Prototyping, Optical switching, Clocks, Signal processing, Packet switching, Switching, Process control, Wavelength division multiplexing

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Proceedings Article | 21 September 2006 Paper

Enabling technology for future gigabit-symmetric FTTH: coherent OCDMA over WDM-PON

Ken-ichi Kitayama, Xu Wang, Naoya Wada

Proceedings Volume 6353, 63531A (2006) https://doi.org/10.1117/12.688042

KEYWORDS: Fiber to the x, Wavelength division multiplexing, WDM-PON, Optical encoders, Fiber Bragg gratings, Optical components, Ultrafast phenomena, Switching, Semiconductor lasers, Communication and information technologies

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Proceedings Article | 28 January 2006 Paper

Multi-port optical spectrum synthesizer using arrayed waveguide grating for photonic parallel processing

Yuki Komai, Naoya Wada, Fumi Moritsuka, Kashiko Kodate

Proceedings Volume 6025, 60250V (2006) https://doi.org/10.1117/12.667031

KEYWORDS: Computer programming, Waveguides, Channel projecting optics, Multiplexing, Photonic integrated circuits, Signal processing, Phase shifts, Parallel processing, Optical signal processing, Optical networks

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Proceedings Article | 28 January 2006 Paper

OPS system with coherent time-spreading optical code label using PLC and SSFBG

Xu Wang, Naoya Wada

Proceedings Volume 6025, 60250O (2006) https://doi.org/10.1117/12.667015

KEYWORDS: Photonic integrated circuits, Fiber Bragg gratings, Computer programming, Phase shifts, Packet switching, Receivers, Polarization, Picosecond phenomena, Clocks, Optical networks

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Proceedings Article | 30 December 2005 Paper

160GHz to 20GHz variable rate RZ and CS-RZ pulse trains generation based on phase and attenuation tunable high-resolution AWG, and its application to photonic networks

Naoya Wada, Yuki Komai, Fumi Moritsuka, Kashiko Kodate

Proceedings Volume 6028, 60281R (2005) https://doi.org/10.1117/12.667323

KEYWORDS: Phase shifts, Photonic integrated circuits, Attenuators, Computer programming, Optical filters, Integrated optics, Mirrors, Optical amplifiers, Streak cameras, Second-harmonic generation

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Proceedings Article | 9 December 2005 Paper

Enabling techniques for asynchronous coherent OCDMA

Xu Wang, Naoya Wada, Ken-ichi Kitayama

Proceedings Volume 6021, 60212Z (2005) https://doi.org/10.1117/12.634265

KEYWORDS: Picosecond phenomena, Computer programming, Receivers, Forward error correction, Polarization, Fiber Bragg gratings, Modulators, Transmitters, Phase shifts, Interference (communication)

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Proceedings Article | 25 October 2005 Paper

Optical code-label processing-based packet switching and related technologies

Naoya Wada

Proceedings Volume 6012, 60120B (2005) https://doi.org/10.1117/12.630513

KEYWORDS: Switches, Prototyping, Receivers, Clocks, Packet switching, Switching, Photonic integrated circuits, Optical amplifiers, Optical switching, Control systems

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Proceedings Article | 8 February 2005 Paper

Performance analysis of using superstructured FBGs for OCDMA and OPS applications over WDM networks

Xu Wang, Naoya Wada, Fumito Kubota, Ken-ichi Kitayama

Proceedings Volume 5626, (2005) https://doi.org/10.1117/12.581019

KEYWORDS: Fiber Bragg gratings, Wavelength division multiplexing networks, Photonic integrated circuits, Wavelength division multiplexing, Computer programming, Transmitters, Receivers, Integrated optics, Packet switching, Network architectures

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Proceedings Article | 8 February 2005 Paper

Optical-code-based optical burst switching networks

Ken-ichi Kitayama, Naoya Wada, Masayuki Murata, Shinsuke Hara

Proceedings Volume 5626, (2005) https://doi.org/10.1117/12.582784

KEYWORDS: Switching, Process control, Optical networks, Wavelength division multiplexing, Optical switching, Signal processing, Electronics, Ultrafast phenomena, Packet switching, Switches

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Proceedings Article | 19 November 2003 Paper

Label processing for photonic network with angular-multiplexed spectral hologram

Kayo Shimizu, Naoko Kawakami, Naoya Wada, Wataru Chujo, Kashiko Kodate

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.525863

KEYWORDS: Holograms, Holography, Signal processing, Multiplexing, Optical simulations, Photonic integrated circuits, Diffraction gratings, Optical fibers, Optical encoders, Digital signal processing

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Proceedings Article | 19 November 2003 Paper

Multi-hop, 40Gbit/s variable length photonic packet routing based on multi-wavelength label switching

Naoya Wada, Hiroaki Harai

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.529157

KEYWORDS: Switching, Switches, Fiber Bragg gratings, Transmitters, Network architectures, Receivers, Signal generators, Analytical research, Packet switching, Data communications

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Proceedings Article | 1 October 2003 Paper

Packet-selective photonic add/drop mulitplexer at 40 Gb/s using optical-code label

Nobuyuki Kataoka, Ken-ichi Kitayama, Naoya Wada, Fumito Kubota

Proceedings Volume 5285, (2003) https://doi.org/10.1117/12.533325

KEYWORDS: Multiplexers, Signal processing, Optical networks, Multiplexing, Wavelength division multiplexing, Optical switching, Signal generators, Computer programming, Switches, Optical communications

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Proceedings Article | 8 July 2002 Paper

Photonic packet routing based on multiwavelength label switch using multisection fiber Bragg gratings

Naoya Wada, Hiroaki Harai

Proceedings Volume 4872, (2002) https://doi.org/10.1117/12.475118

KEYWORDS: Switches, Switching, Packet switching, Fiber Bragg gratings, Transmitters, X band, Network architectures, Photonics systems, Receivers, Wavelength division multiplexing

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Proceedings Article | 14 June 2002 Paper

High-resolution coherence domain reflectometry using 1.55 um supercontinuum source and quadrature spectral detection

Elwyn Smith, Naoya Wada, Wataru Chujo, David Sampson

Proceedings Volume 4619, (2002) https://doi.org/10.1117/12.470464

KEYWORDS: Optical coherence tomography, Interferometers, Supercontinuum sources, Reflectometry, Dispersion, Spectral resolution, Fourier transforms, Mirrors, Refractive index, Spectrum analysis

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