Yoshiki Nishida
Nippon Telegraph and Telephone
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Publication
Featured researches published by Yoshiki Nishida.
Optics Letters | 1998
Yasutake Ohishi; Atsushi Mori; Makoto Yamada; Hirotaka Ono; Yoshiki Nishida; Kiyoshi Oikawa
The signal-gain characteristics of tellurite-based erbium-doped fiber amplifiers are clarified based on spectroscopic properties and signal-gain measurements. The potential of tellurite-based erbium-doped fiber for use as a broadband light source is also described.
Optics Letters | 2003
Masaki Asobe; Osamu Tadanaga; Hiroshi Miyazawa; Yoshiki Nishida; Hiroyuki Suzuki
We have devised a novel device structure for a multiple quasi-phase-matched wavelength converter. Optimized continuous phase modulation of a periodic domain structure makes possible multichannel pumping with minimum loss of efficiency. Using the device, we demonstrate variable and simultaneous wavelength conversion of wavelength-division multiplexed signals.
Applied Physics Letters | 2006
Osamu Tadanaga; Tsutomu Yanagawa; Yoshiki Nishida; Hiroshi Miyazawa; Katsuaki Magari; Masaki Asobe; Hiroyuki Suzuki
We fabricate 50-mm-long direct-bonded quasi-phase-matched LiNbO3 ridge waveguides for difference frequency generation in the 3-μm wavelength range. Conversion efficiency of 40%/W is achieved using a 1-μm-band pump and a 1.55-μm-band signal, and a 0.26-mW output is obtained. We also use the device to demonstrate methane gas detection at around 3.3μm.
Optics Express | 2009
Tadashi Nishikawa; A. Ozawa; Yoshiki Nishida; Masaki Asobe; Feng-Lei Hong; T. W. Hänsch
A solid-state-laser based single-frequency 589 nm light source that can be easily used in the laboratory is needed for sodium spectroscopy studies and cold sodium atom experiments. This paper shows that by using a periodically poled Zn-doped LiNbO(3) ridge waveguide for sum-frequency generation, we can obtain a high conversion efficiency to 589 nm light from two sub-watt 1064 and 1319 nm Nd:YAG lasers via a simple single pass wavelength conversion process without employing an enhancement cavity. A 494 mW light at 589 nm is generated and achieves overall conversion efficiency from the laser power of 41%. Excellent long-term stability of output power is obtained and its standard deviation is characterized to be 0.09%.
Optics Express | 2009
James F. Dynes; Hiroki Takesue; Zhiliang Yuan; A. W. Sharpe; Kenichi Harada; Toshimori Honjo; Hidehiko Kamada; Osamu Tadanaga; Yoshiki Nishida; Masaki Asobe; A. J. Shields
Here we report the first demonstration of entanglement distribution over a record distance of 200 km which is of sufficient fidelity to realize secure communication. In contrast to previous entanglement distribution schemes, we use detection elements based on practical avalanche photodiodes (APDs) operating in a self-differencing mode. These APDs are low-cost, compact and easy to operate requiring only electrical cooling to achieve high single photon detection efficiency. The self-differencing APDs in combination with a reliable parametric down-conversion source demonstrate that entanglement distribution over ultra-long distances has become both possible and practical. Consequently the outlook is extremely promising for real world entanglement-based communication between distantly separated parties.
Optics Letters | 2005
Hiroki Takesue; Kyo Inoue; Osamu Tadanaga; Yoshiki Nishida; Masaki Asobe
We report a scheme for generating pulsed polarization-entangled photon pairs based on conversion from time-bin entanglement to polarization entanglement by use of an orthogonal polarization delay circuit and post-selection. We have experimentally demonstrated the scheme, using a periodically poled lithium niobate waveguide, and successfully obtained polarization entanglement in the 1.55-microm telecom wavelength band.
IEEE Journal of Quantum Electronics | 2005
Masaki Asobe; Osamu Tadanaga; Hiroshi Miyazawa; Yoshiki Nishida; Hiroyuki Suzuki
We propose a new multiple quasi-phase-matched wavelength converter based on the continuous phase modulation of a /spl chi//sup (2)/ grating for use in variable wavelength conversion. A numerical study shows that the proposed device exhibits a high conversion efficiency, flexible design, and robust fabrication tolerance. A waveguide device fabricated by annealed proton exchange agrees well with the numerical design. Fine-tuning the device enabled us to demonstrate variable wavelength conversion between signals on the standard optical frequency grid. Using the device, we also demonstrated fast (<100 ps) wavelength switching of 4-channel 40-Gb/s signals. The obtained results clearly show that the proposed multiple quasi-phase-matched devices will be useful when constructing future flexible photonic networks.
Optics Express | 2007
Toshimori Honjo; Hiroki Takesue; Hidehiko Kamada; Yoshiki Nishida; Osamu Tadanaga; Masaki Asobe; Kyoichi Inoue
We report an experimental demonstration of the distribution of time-bin entangled photon pairs over 100 km of optical fiber. In our experiment, 1.5-mum non-degenerated time-bin entangled photon pairs were generated with a periodically poled lithium niobate (PPLN) waveguide by using the parametric down conversion process. Combining this approach with ultra-low-loss filters to eliminate the pump light and separate signal and idler photons, we obtained an efficient entangled photon pair source. To detect the photons, we used single-photon detectors based on frequency up-conversion. These detectors operated in a non-gated mode so that we could use a pulse stream of time correlated entangled photon pairs at a high repetition frequency (1 GHz). Using these elements, we distributed time-bin entangled photon pairs over 100 km of dispersion shifted fiber and performed a two-photon interference experiment. We obtained a coincidence fringe of 81.6% visibility without subtracting any background noise, such as accidental coincidence or dark count, which was good enough to violate Bells inequality. Thus, we successfully distributed time-bin entangled photon pairs over 100 km.
Optics Express | 2008
Toshimori Honjo; Sae Woo Nam; Hiroki Takesue; Qiang Zhang; Hidehiko Kamada; Yoshiki Nishida; Osamu Tadanaga; Masaki Asobe; Burm Baek; Robert H. Hadfield; Shigehito Miki; Mikio Fujiwara; Masahide Sasaki; Zhen Wang; Kyoichi Inoue; Yoshihisa Yamamoto
We report the first entanglement-based quantum key distribution (QKD) experiment over a 100-km optical fiber. We used superconducting single photon detectors based on NbN nanowires that provide high-speed single photon detection for the 1.5-mum telecom band, an efficient entangled photon pair source that consists of a fiber coupled periodically poled lithium niobate waveguide and ultra low loss filters, and planar lightwave circuit Mach-Zehnder interferometers (MZIs) with ultra stable operation. These characteristics enabled us to perform an entanglement-based QKD experiment over a 100-km optical fiber. In the experiment, which lasted approximately 8 hours, we successfully generated a 16 kbit sifted key with a quantum bit error rate of 6.9 % at a rate of 0.59 bits per second, from which we were able to distill a 3.9 kbit secure key.
Optics Express | 2007
Dirk Richter; Petter Weibring; Alan Fried; Osamu Tadanaga; Yoshiki Nishida; Masaki Asobe; Hiroyuki Suzuki
A novel waveguide for difference frequency generation in the mid-IR spectral region at 3.52 mum is characterized. High mid-IR power of 15 mW and an external conversion efficiency of up to 19 %W( -1) have been obtained. An optical beam propagation factor M(2) =1.18 was determined using the second moment method. A simple 2-f absorption spectra demonstrates the potential of this mid-IR source for high precision trace gas sensing applications.