Prof. Ken-ichi Kitayama Profile

Prof. Ken-ichi Kitayama

Professor at GPI

SPIE Involvement:

Conference Chair | Editor | Author

Publications (28)

Proceedings Article | 9 March 2024 Presentation

Experimental investigation of DSP complexity of low-power beyond-300G IM-DD short-reach links

Paikun Zhu, Yuya Yamaguchi, Yuki Yoshida, Tien Dat Pham, Masayuki Motoya, Shingo Takano, Ryo Shimizu, Kouichi Akahane, Ken-ichi Kitayama

Proceedings Volume PC12894, PC1289402 (2024) https://doi.org/10.1117/12.2692260

KEYWORDS: Digital signal processing, Radio optics, Forward error correction, Transmitters, Receivers, Standards development, Pulse signals, Power consumption, Optical transmission, Modulation

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Proceedings Article | 7 March 2021 Presentation

Welcome and Introduction to SPIE Conference 11703

Bahram Jalali, Ken-ichi Kitayama

Proceedings Volume 11703, 1170302 (2021) https://doi.org/10.1117/12.2592197

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Proceedings Article | 5 March 2021 Poster + Presentation

Simplified detection technique of compressed image using CMOS area sensor

Munenori Takumi, Keisuke Uchida, Katsuhiro Ishii, Ken-ichi Kitayama

Proceedings Volume 11703, 117031N (2021) https://doi.org/10.1117/12.2577405

KEYWORDS: Sensors, Picosecond phenomena, Image sensors, Image quality, Imaging systems, Image compression, Image acquisition, Digital micromirror devices, Data acquisition, Computer programming

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Proceedings Article | 13 March 2019 Presentation

Overloading 5G/IoT fronthaul networks (Conference Presentation)

Yuki Yoshida, Paikun Zhu, Ken'ichi Kitayama

Proceedings Volume 10945, 109450C (2019) https://doi.org/10.1117/12.2511540

KEYWORDS: Signal detection

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Proceedings Article | 7 February 2015 Paper

Waveform over fiber: DSP-aided coherent fiber-wireless transmission using millimeter and terahertz waves

Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama

Proceedings Volume 9387, 93870C (2015) https://doi.org/10.1117/12.2077056

KEYWORDS: Radio optics, Radio over Fiber, Digital signal processing, Modulation, Modulators, Networks, Signal generators, Terahertz radiation, Frequency conversion, Signal to noise ratio

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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 | 5 February 2013 Paper

Impact of wave propagation delay on latency in optical communication systems

Tetsuya Kawanishi, Atsushi Kanno, Yuki Yoshida, Ken-ichi Kitayama

Proceedings Volume 8646, 86460C (2013) https://doi.org/10.1117/12.1000190

KEYWORDS: Radio propagation, Satellites, Optical fibers, Single mode fibers, Free space optics, Wave propagation, Telecommunications, Light wave propagation, Refractive index, Data transmission

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Proceedings Article | 4 February 2013 Paper

100-GHz and 300-GHz coherent radio-over-fiber transmission using optical frequency comb source

Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-ichi Kitayama

Proceedings Volume 8645, 864503 (2013) https://doi.org/10.1117/12.1000150

KEYWORDS: Radio over Fiber, Radio optics, Digital signal processing, Frequency combs, Optical amplifiers, Forward error correction, Telecommunications, Signal detection, Antennas, Signal generators

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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 | 19 November 2008 Paper

An experimental analysis on OSPF-TE convergence time

S. Huang, K. Kitayama, F. Cugini, F. Paolucci, A. Giorgetti, L. Valcarenghi, P. Castoldi

Proceedings Volume 7137, 713728 (2008) https://doi.org/10.1117/12.803224

KEYWORDS: Opacity, Databases, Network architectures, Time metrology, Failure analysis, Optical networks, Computer architecture, Chemical elements, Switching, Internet

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Open shortest path first (OSPF) protocol is commonly used as an interior gateway protocol (IGP) in MPLS and generalized MPLS (GMPLS) networks to determine the topology over which label-switched paths (LSPs) can be established. Traffic-engineering extensions (network states such as link bandwidth information, available wavelengths, signal quality, etc) have been recently enabled in OSPF (henceforth, called OSPF-TE) to support shortest path first (SPF) tree calculation upon different purposes, thus possibly achieving optimal path computation and helping improve resource utilization efficiency. Adding these features into routing phase can exploit the OSPF robustness, and no additional network component is required to manage the traffic-engineering information. However, this traffic-engineering enhancement also complicates OSPF behavior. Since network states change frequently upon the dynamic trafficengineered LSP setup and release, the network is easily driven from a stable state to unstable operating regimes. In this paper, we focus on studying the OSPF-TE stability in terms of convergence time. Convergence time is referred to the time spent by the network to go back to steady states upon any network state change. An external observation method (based on black-box method) is employed to estimate the convergence time. Several experimental test-beds are developed to emulate dynamic LSP setup/release, re-routing upon single-link failure. The experimental results show that with OSPF-TE the network requires more time to converge compared to the conventional OSPF protocol without TE extension. Especially, in case of wavelength-routed optical network (WRON), introducing per wavelength availability and wavelength continuity constraint to OSPF-TE suffers severe convergence time and a large number of advertised link state advertisements (LSAs). Our study implies that long convergence time and large number of LSAs flooded in the network might cause scalability problems in OSPF-TE and impose limitations on OSPF-TE applications. New solutions to mitigate the s convergence time and to reduce the amount of state information are desired in the future.

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 | 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 | 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 | 8 December 2005 Paper

DWDM millimeter-wave radio-on-fiber systems

Hiroyuki Toda, Toshiaki Kuri, Ken-ichi Kitayama

Proceedings Volume 6021, 60210K (2005) https://doi.org/10.1117/12.638989

KEYWORDS: Radio over Fiber, Light sources, Dense wavelength division multiplexing, Multiplexing, Waveguides, Modulation, Channel projecting optics, Radio optics, Electronic filtering, Single mode fibers

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Proceedings Article | 6 December 2005 Paper

Photonic network R and D activities in Japan

Ken-ichi Kitayama, Tetsuya Miki, Toshio Morioka, Hideaki Tsushima, Masafumi Koga, Kazuyuki Mori, Soichiro Araki, Ken-ichi Sato, Hiroshi Onaka, Shu Namiki, Tomonori Aovama

Proceedings Volume 6022, 60221M (2005) https://doi.org/10.1117/12.635576

KEYWORDS: Networks, Switching, Network architectures, Wavelength division multiplexing, Optical networks, Ultrafast phenomena, Optical switching, Dispersion, Forward error correction, Broadband telecommunications

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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 | 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 | 19 August 2003 Paper

Versatile optical-code-based MPLS for circuit-, burst-, and packet switchings

Ken-ichi Kitayama

Proceedings Volume 5247, (2003) https://doi.org/10.1117/12.510936

KEYWORDS: Switching, Wavelength division multiplexing, Packet switching, Switches, Optical correlators, Integrated optics, Optical switching, Optical components, Optical circuits, Signal processing

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Proceedings Article | 23 August 2002 Paper

Demultiplexing using an arrayed-waveguide grating for frequency-interleaved DWDM radio-on-fiber systems with 25-GHz channel spacing

Hiroyuki Toda, Tsukasa Yamashita, Ken-ichi Kitayama, Toshiaki Kuri

Proceedings Volume 4906, (2002) https://doi.org/10.1117/12.480557

KEYWORDS: Dense wavelength division multiplexing, Radio optics, Waveguides, Channel projecting optics, Single mode fibers, Multiplexing, Modulation, Double sideband modulation, Fabry–Perot interferometers, Telecommunications

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Proceedings Article | 3 July 2002 Paper

Packet scheduling for WDM fiber delay line buffers in photonic packet switches

Takashi Yamaguchi, Ken-ichi Baba, Masayuki Murata, Ken-ichi Kitayama

Proceedings Volume 4874, (2002) https://doi.org/10.1117/12.475303

KEYWORDS: Switches, Wavelength division multiplexing, Switching, Multiplexers, Multiplexing, Computer architecture, Transmittance, Information science, Communication engineering, Control systems

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Proceedings Article | 30 May 2001 Paper

Image fiber coupler design and its performance

Moriya Nakamura, Ken-ichi Kitayama

Proceedings Volume 4292, (2001) https://doi.org/10.1117/12.428022

KEYWORDS: Fiber couplers, GRIN lenses, Optical interconnects, Cylindrical lenses, Optical alignment, Image transmission, Vignetting, Multiplexing, Vertical cavity surface emitting lasers, Cameras

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Proceedings Article | 18 December 2000 Paper

Photonics for millimeter-wave broadband wireless

Andreas Stoehr, Robert Heinzelmann, Ken-ichi Kitayama, Toshiaki Kuri, Dieter Jaeger

Proceedings Volume 4111, (2000) https://doi.org/10.1117/12.422148

KEYWORDS: Modulation, Waveguides, Transceivers, Modulators, Signal detection, Absorption, Photonics, Photodetectors, Sensors, Fiber optics

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Proceedings Article | 15 December 2000 Paper

Electroabsorption transceiver (EAT): device concepts and system applications

Andreas Stoehr, Robert Heinzelmann, Toshiaki Kuri, Ken-ichi Kitayama, Dieter Jaeger

Proceedings Volume 4087, (2000) https://doi.org/10.1117/12.406417

KEYWORDS: Transceivers, Modulation, Signal detection, Telecommunications, L band, Wireless communications, Waveguides, Modulators, Network architectures, Polarization

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Recently, lightwave systems have attracted great interest not only for digital optical communication but also for the distribution of microwave and mm-wave signals in wireless applications. Future wireless communication networks are expected to offer broadband multimedia services to a large number of subscribers. As a consequence, the radio frequency is expected to be within the mm-wave band where a sufficient bandwidth for the large number of broadband channels is available. Since the electrical transmission of the mm-wave radio signals over long distances is not feasible, fiber-wireless systems have attracted great interest. They are considered to form the backbone of future broadband mm-wave wireless communication systems. Obviously, the successful implementation of mm-wave wireless communication networks in mass-market applications strongly depends on the costs of the infrastructure. In that respect, specially the cost of each single base station (BS) is a very critical factor since future wireless networks are expected to support a large number of remote BSs. Consequently, it is of great interest to reduce the base station complexity and cost. In this paper, we present a novel photonic transceiver component and discuss its application in mm-wave fiber-wireless systems. In detail, an InP-based 1 .55im waveguide electroabsorption transceiver (EATs) is presented that serves as a modulator and a photodetector simultaneously. Besides the basic device concept and its properties, the employment of high-speed EAT in 60GHz millimeter-wave (mm-wave) fiber-wireless applications is experimentally demonstrated. For the first time, full-duplex broadband (155.52Mbit/s) fiber-optic transmission in the 60GHz band has been achieved in a point-to-point link. Furthermore, a point-to-multipoint fiber-ring network architecture employing EAT is presented and in a first experiment full-duplex point-to-multipoint operation in the 60GHz band is experimentally demonstrated.

Proceedings Article | 27 April 2000 Paper

Image fiber skew characteristics

Moriya Nakamura, Toshimichi Otsubo, Ken-ichi Kitayama

Proceedings Volume 3952, (2000) https://doi.org/10.1117/12.384427

KEYWORDS: Optical interconnects, Streak cameras, Image transmission, Multiplexing, Fiber characterization, Refractive index, Telecommunications, Analytical research, Cladding, Dispersion

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Proceedings Article | 13 April 1999 Paper

Image fiber optic 2D parallel optical interconnects based on space-CDMA

Moriya Nakamura, Ken-ichi Kitayama

Proceedings Volume 3632, (1999) https://doi.org/10.1117/12.344621

KEYWORDS: Optical interconnects, Image transmission, Optical alignment, Image processing, Multiplexing, Fiber couplers, Array processing, Fiber optics, Visualization, Transmittance

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Proceedings Article | 12 July 1993 Paper

Implementations of optical image crossbar switch

Masaki Fukui, Ken-ichi Kitayama

Proceedings Volume 1806, (1993) https://doi.org/10.1117/12.147818

KEYWORDS: Switches, Switching, Spherical lenses, Imaging systems, Optical arrays, Parallel processing, Camera shutters, Light sources, Lithium, Prototyping

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Proceedings Article | 12 July 1993 Paper

Processing capability of a parallel optical computing system based on image logic algebra

Masaki Fukui, Ken-ichi Kitayama

Proceedings Volume 1806, (1993) https://doi.org/10.1117/12.147852

KEYWORDS: Logic, Computing systems, Optical components, Image processing, Optical computing, Switching, Parallel processing, Image transmission, Optical signal processing, Semiconductor lasers

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Showing 5 of 28 publications

Proceedings Volume Editor (11)

SPIE Conference Volume | 25 March 2024

AI and Optical Data Sciences V

SPIE Conference Volume | 17 April 2023

AI and Optical Data Sciences IV

SPIE Conference Volume | 28 March 2022

AI and Optical Data Sciences III

SPIE Conference Volume | 9 April 2021

AI and Optical Data Sciences II

SPIE Conference Volume | 12 March 2020

AI and Optical Data Sciences

Showing 5 of 11 publications

Conference Committee Involvement (17)

AI and Optical Data Sciences VI

25 January 2025 | San Francisco, California, United States

AI and Optical Data Sciences V

29 January 2024 | San Francisco, California, United States

AI and Optical Data Sciences IV

30 January 2023 | San Francisco, California, United States

AI and Optical Data Sciences III

24 January 2022 | San Francisco, California, United States

AI and Optical Data Sciences II

6 March 2021 | Online Only, California, United States

AI and Optical Data Sciences

4 February 2020 | San Francisco, California, United States

Optical Data Science II

6 February 2019 | San Francisco, California, United States

Optical Data Science: Trends Shaping the Future of Photonics

30 January 2018 | San Francisco, California, United States

SPIE/OSA/IEEE Asia Communications and Photonics

13 November 2011 | Shanghai, China

Optical Transmission, Switching, and Subsystems VI

27 October 2008 | Hangzhou, China

Photonics Packaging, Integration, and Interconnects VIII

22 January 2008 | San Jose, California, United States

Optical Transmission, Switching, and Subsystems

2 November 2007 | Wuhan, China

Optical Transmission, Switching, and Subsystems IV

5 September 2006 | Gwangju, South Korea

Optical Transmission, Switching, and Subsystems III

7 November 2005 | Shanghai, China

Optical Transmission Systems and Equipment for WDM Networking IV

25 October 2005 | Boston, MA, United States

Optical Transmission Systems and Equipment for WDM Networking III

25 October 2004 | Philadelphia, Pennsylvania, United States

Optical Transmission Systems and Equipment for WDM Networking II

8 September 2003 | Orlando, Florida, United States

Showing 5 of 17 Conference Committees

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