Journal ArticleDOI
Polarization-Insensitive Quantum Dot Semiconductor Optical Amplifiers Using Strain-Controlled Columnar Quantum Dots
Nami Yasuoka,Hiroji Ebe,Kenichi Kawaguchi,Mitsuru Ekawa,Shigeaki Sekiguchi,Ken Morito,Osamu Wada,Mariko Sugawara,Y. Arakawa +8 more
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TLDR
In this paper, a strain-controlled columnar quantum dot optical amplifiers (SC-CQDs) were proposed for the 1.5-μm wavelength band, which exhibited a high aspect ratio and had strain controlled side barriers for polarization-insensitive operation.Abstract:
A polarization-insensitive quantum dot semiconductor optical amplifiers (QD-SOAs) have been studied for use in future optical communication systems. A part of our work shows that the optical polarization property in QDs depends on both their aspect ratio and strain. To control these two parameters, we propose the use of strain-controlled columnar QDs (SC-CQDs), which exhibit a high aspect ratio and have strain-controlled side barriers for polarization-insensitive operation in the 1.5-μ m wavelength band. QD-SOAs with these optimized SC-CQDs demonstrated polarization-insensitive characteristics. They showed a gain of 8.0 dB with polarization dependence of the gain as low as 0.4 dB, -3-dB saturation output power of 18.5 dBm at a wavelength of 1550 nm, and error-free amplification at a bit rate of 40 Gbit/s.read more
Citations
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Direct generation of linearly-polarized photon emission with designated orientations from site- controlled InGaN quantum dots
Anders Lundskog,Chih-Wei Hsu,K. Fredrik Karlsson,S. Amloy,S. Amloy,Daniel Nilsson,Urban Forsberg,Per-Olof Holtz,Erik Janzén +8 more
TL;DR: In this article, the synthesis of QDs emitting photons with pre-defined a specific set of parameters has been studied for the emission of single photons on demand during the past decade.
Journal ArticleDOI
Proposal for ultrafast all-optical XNOR gate using single quantum-dot semiconductor optical amplifier-based Mach–Zehnder interferometer
TL;DR: In this article, the feasibility of realizing an all-optical XNOR gate for 160Gb/s return-to-zero data pulses by using for the first time a single quantum-dot semiconductor optical amplifier (QD-SOA)-based Mach-Zehnder interferometer (MZI) is theoretically investigated and demonstrated.
Journal ArticleDOI
Design of ultrafast all-optical 4-bit parity generator and checker using quantum-dot semiconductor optical amplifier-based Mach-Zehnder interferometer
TL;DR: In this article, the feasibility of implementing an ultrafast 4-bit parity generator and checker using the quantum-dot semiconductor optical amplifier (QD-SOA)-based Mach-Zehnder Interferometer (MZI) as XOR gate is theoretically investigated and demonstrated.
Journal ArticleDOI
Coherent Wavelength Conversion in a Quantum Dot SOA
TL;DR: In this paper, the authors experimentally demonstrate wavelength conversion of coherent signals in an InAs/InGaAsP/InP columnar quantum dot semiconductor optical amplifier by using low power single pump four-wave mixing.
Journal ArticleDOI
Ultra-broad band, low power, highly efficient coherent wavelength conversion in quantum dot SOA.
TL;DR: Broadband, all-optical wavelength conversion over 100 nm span, in full S- and C-band, with positive conversion efficiency with low optical input power exploiting dual pump Four-Wave-Mixing in a Quantum Dot Semiconductor Optical Amplifier (QD-SOA).
References
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Journal ArticleDOI
Electronic and optical properties of strained quantum dots modeled by 8-band k⋅p theory
TL;DR: In this paper, the elastic, electronic, and linear optical properties of quantum dot double heterostructures in the frame of eight-band quantum dot theory were investigated for a capped pyramid shaped InAs quantum dots in GaAs (001) with ${101}$ facets.
Journal ArticleDOI
Theory of optical signal amplification and processing by quantum-dot semiconductor optical amplifiers
M. Sugawara,Hiroji Ebe,N. Hatori,M. Ishida,Yasuhiko Arakawa,Tomoyuki Akiyama,Koji Otsubo,Yoshiaki Nakata +7 more
TL;DR: In this paper, a theory of optical signal amplification and processing by quantum-dot semiconductor optical amplifiers (SOA's) based on the density matrix equations to treat electron-light interaction and the optical pulse propagation equations is presented.
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An ultrawide-band semiconductor optical amplifier having an extremely high penalty-free output power of 23 dBm achieved with quantum dots
Tomoyuki Akiyama,Mitsuru Ekawa,M. Sugawara,Kenichi Kawaguchi,Hisao Sudo,Akito Kuramata,Hiroji Ebe,Y. Arakawa +7 more
TL;DR: In this paper, a semiconductor optical amplifier (SOA) having a gain of >25 dB, noise figure of 19 dBm, over the record widest bandwidth of 90 nm among all kinds of optical amplifiers, and also having a penalty-free output power of 23 dBm was realized by using quantum dots.
Journal ArticleDOI
Quantum-Dot Semiconductor Optical Amplifiers for High Bit-Rate Signal Processing over 40 Gbit/s
TL;DR: In this article, a theory and simulation of traveling-type semiconductor optical amplifiers (SOAs) with self-assembled quantum dots in their active region is provided. And the results demonstrate that quantum-dot SOAs can process multiple-wavelength high bit-rate optical pulse trains over 40 Gbit/s under gain saturation.
Journal ArticleDOI
Nonlinear gain dynamics in quantum-dot optical amplifiers and its application to optical communication devices
Tomoyuki Akiyama,Haruhiko Kuwatsuka,Takashi Simoyama,Yoshiaki Nakata,Kohki Mukai,Mitsuru Sugawara,Osamu Wada,Hideaki Ishikawa +7 more
TL;DR: In this paper, the authors studied the gain dynamics in quantum-dot (QD) optical amplifiers and found that there are at least three nonlinear processes, which are attributed to carrier relaxation to the ground states, phonon scattering, and carrier capture from the wetting layers into the QDs.