Journal ArticleDOI
Analysis of Gain-Switching Characteristics Including Strong Gain Saturation Effects in Low-Dimensional Semiconductor Lasers
Shaoqiang Chen,Masahiro Yoshita,Masahiro Yoshita,Ito Takashi,Toshimitsu Mochizuki,Hidefumi Akiyama,Hiroyuki Yokoyama,Kenji Kamide,Tetsuo Ogawa +8 more
Reads0
Chats0
TLDR
In this article, the effects of gain nonlinearities on gain-switched short-pulse-generation characteristics are analyzed via rate equations assuming a nonlinear gain model including a gain saturation parameter gs to quantitatively describe the strong gain-saturation nonlinearity in low-dimensional semiconductor lasers at high carrier densities.Abstract:
The effects of gain nonlinearities on gain-switched short-pulse-generation characteristics are analyzed via rate equations assuming a nonlinear-gain model including a gain saturation parameter gs to quantitatively describe the strong gain-saturation nonlinearity in low-dimensional semiconductor lasers at high carrier densities. It was found that the minimum pulse width and the delay time are mainly determined by gs rather than a differential gain coefficient g0 and a gain compression factor e. By tracing the temporal evolution of carrier density, photon density, and material gain during gain switching, distinctly different effects of gs, e, and cavity lifetime τp on pulse generation were clarified.read more
Citations
More filters
Journal ArticleDOI
Spectral dynamics of picosecond gain-switched pulses from nitride-based vertical-cavity surface-emitting lasers
Shaoqiang Chen,Takashi Ito,Akifumi Asahara,Masahiro Yoshita,Wenjie Liu,Jiang-Yong Zhang,Baoping Zhang,Tohru Suemoto,Hidefumi Akiyama +8 more
TL;DR: This work used streak camera to investigate the time- and spectral-resolved lasing characteristics of gain-switched pulses from optically pumped InGaN single-mode vertical-cavity surface-emitting lasers and found that fast initial components with ultra-short durations emerged on short-wavelength sides, while the entire pulses were down-chirped, resulting in the simultaneous broadening of the spectrum and pulse width.
Journal ArticleDOI
Gain-switched pulses from InGaAs ridge-quantum-well lasers limited by intrinsic dynamical gain suppression.
Shaoqiang Chen,Masahiro Yoshita,Ito Takashi,Toshimitsu Mochizuki,Hidefumi Akiyama,Hiroyuki Yokoyama +5 more
TL;DR: Gain-switched pulses of InGaAs double-quantum-well lasers fabricated from identical epitaxial laser wafers were measured under both current injection and optical pumping conditions and quantitatively compared the experimental results with theoretical calculations based on rate equations incorporating gain nonlinearities.
Journal ArticleDOI
Transient hot-carrier optical gain in a gain-switched semiconductor laser
Takashi Ito,Shaoqiang Chen,Masahiro Yoshita,Toshimitsu Mochizuki,Changsu Kim,Hidefumi Akiyama,Loren Pfeiffer,Ken W. West +7 more
TL;DR: In this article, the transient optical gain was quantitatively determined from the rise time of output pulses of a gain-switched semiconductor laser via impulsive optical pumping, and the optical gain for a high carrier density during gain switching was greatly reduced from that during steady-state operation because of hot carriers.
Journal ArticleDOI
Dynamics of short-pulse generation via spectral filtering from intensely excited gain-switched 1.55-μm distributed-feedback laser diodes.
TL;DR: Picosecond-pulse-generation dynamics and pulse-width limiting factors via spectral filtering from intensely pulse-excited gain-switched 1.55-μm distributed-feedback laser diodes were studied and it was found that the expected pulse widths with optimum spectral widths was consistent with the experimental data.
Journal ArticleDOI
Blue 6-ps short-pulse generation in gain-switched InGaN vertical-cavity surface-emitting lasers via impulsive optical pumping
Shaoqiang Chen,Makoto Okano,Baoping Zhang,Masahiro Yoshita,Hidefumi Akiyama,Yoshihiko Kanemitsu +5 more
TL;DR: In this article, the authors reported the demonstration of the picosecond-pulse lasing in blue region from an optically pumped gain-switched InGaN vertical-cavity surface-emitting laser (VCSEL).
References
More filters
Book
The Water Footprint Assessment Manual: Setting the Global Standard
TL;DR: The Water Footprint Network (WFN) as mentioned in this paper is a set of definitions and methods for water footprint accounting, as well as a library of water footprint response options for consumers, nations, and businesses.
Journal ArticleDOI
Quantum well lasers--Gain, spectra, dynamics
Yasuhiko Arakawa,Amnon Yariv +1 more
TL;DR: In this article, the authors discuss a number of theoretical and experimental issues in quantum well lasers with emphasis on the basic behavior of the gain, the field spectrum, and the modulation dynamics and reveal that the use of quantum well structures results in improvement of these properties and brings several new concepts to optical semiconductor devices.
Journal ArticleDOI
Effect of gain saturation on injection laser switching
TL;DR: In this article, gain saturation is introduced into the laser coupled rate equations, and numerical and analytical solutions show considerable damping of relaxation oscillations for small amounts of saturation, even with a small amount of gain saturation.
Journal ArticleDOI
Effect of gain nonlinearities on period doubling and chaos in directly modulated semiconductor lasers
TL;DR: In this paper, it was shown that the nonlinear effects are strong enough that the possibility of chaotic behavior should be of no concern and that gain nonlinearities should be included when gain switching is used for the generation of picosecond pulses.