Kouichi Akahane

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An ultra-broadband photonic transport system has been developed to expand the usable wavelength bandwidth for optical communication. Simultaneous 3 x 10-Gbps error-free photonic transmissions are demonstrated in the 1-microm, C-, and L-wavebands by using the ultra-broadband photonic transport system over a 5.4-km-long holey fiber transmission line.
We examine the timing dependence of nanophotonic devices based on optical excitation transfer via optical near-field interactions at the nanometer scale. We theoretically analyze the dynamic behavior of a two-input nanophotonic switch composed of three quantum dots based on a density matrix formalism while assuming arrival-time differences, or skew, between(More)
interactions and their interfaces with optical far-fields Makoto Naruse, Petter Holmström, Tadashi Kawazoe, Kouichi Akahane, Naokatsu Yamamoto, Lars Thylén, and Motoichi Ohtsu Photonic Network Research Institute, National Institute of Information and Communications Technology, 4-2-1 Nukui-kita, Koganei, Tokyo 184-8795, Japan Nanophotonics Research Center,(More)
This paper describes high-speed optical modulation and detection devices for radio-over-fibre (RoF) systems which can distribute millimetre-wave signals over optical fibres with low-loss, and RoF-based high-performance imaging systems which can be used for foreign object debris in runways or railways. High-speed and high-sensitivity photo-detection would be(More)
To open up a 1-microm waveband for photonic transport systems, we developed a hybrid and harmonically mode-locked semiconductor laser (MLL) that can transmit return-to-zero (RZ) optical signals at data rates on the order of gigabits per second. A single-mode hole-assisted fiber (HAF) was also developed for use as a 1-microm waveband signal transmission(More)
An InGaAs quantum dot (QD) laser diode with 19-stacked QDs separated by 20 nm-thick GaAs spacers was fabricated using an ultrahigh-rate molecular beam epitaxial growth technique, and the laser characteristics were evaluated. A 19-stacked simple broad area QD laser diode was lased at the 1000 nm waveband. A net modal gain of 103 cm(-1) was obtained at 2.25(More)
Simultaneous triple-waveband, 10-Gbps error-free photonic transport with clear eye-openings are demonstrated in the 1-µm, C-, and L-wavebands by using an ultra-broadband photonic transport system comprising a single and long holey fiber transmission line.
In this paper, we experimentally demonstrate simultaneous multichannel wavelength multicasting (MWM) and exclusive-OR logic gate multicasting (XOR-LGM) for three 10Gbps non-return-to-zero differential phase-shift-keying (NRZ-DPSK) signals in quantum-dot semiconductor optical amplifier (QD-SOA) by exploiting the four-wave mixing (FWM) process. No additional(More)
An O-band multiple-wavelength light source with 100-GHz channel spacing was successfully demonstrated for the WDM light source using a single quantum dot optical frequency comb laser with an interference injection locking technique.