Topic
Semiconductor optical gain
About: Semiconductor optical gain is a research topic. Over the lifetime, 5997 publications have been published within this topic receiving 96505 citations.
Papers published on a yearly basis
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TL;DR: In this paper, the authors demonstrate the optimum conditions to generate an optical comb via gain-switching of a single-mode DFB semiconductor laser with a large amplitude sinusoidal current, modulating the gain that is sufficient to turn the laser ON and OFF.
Abstract: We demonstrate, through experimental results and supporting numerical simulations, the optimum conditions to generate an optical comb via gain-switching of a single-mode DFB semiconductor laser The DFB laser is biased appropriately and gain-switched with a large amplitude sinusoidal current, modulating the gain that is sufficient to turn the laser ON and OFF This results in the generation of a train of short optical pulses albeit with a relatively large amount of temporal jitter The jitter is a result of the varying turn on time delay, which breaks the periodicity of the pulses leading to an optical spectrum with no discernible tones However, we find that the conditions for creating an optical frequency comb exist when the modulation frequency is greater than or equal to the relaxation oscillation frequency of the laser Corresponding optical pulses are shown to exhibit lower levels of temporal jitter at these optimum points of operation The spectral purity of the comb tones is analyzed, and we show that the FM-noise of the comb tones decreases with increasing modulation frequency with the lower limit set by operating the laser in CW conditions All of the simulation results were obtained using standard laser rate equations
43 citations
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TL;DR: In this article, the authors introduce a novel concept of discretely tunable semiconductor laser with on-chip filtered optical feedback, based on a semiconductor ring laser that can sustain two counter-propagating modes.
Abstract: We introduce a novel concept of discretely tunable semiconductor lasers with on-chip filtered optical feedback. The integrated device is based on a semiconductor ring laser that can sustain two counter-propagating modes. By means of a directional coupler, part of the light emitted by the laser is coupled out to a feedback section integrated on the same chip. The feedback section contains two arrayed waveguide gratings and a set of semiconductor optical amplifiers to provide filtering of particular longitudinal modes sustained by the ring cavity. By controlling the current injected into the semiconductor optical amplifiers, single mode operation in both directions is achieved. In this paper, the design, characterization, and modeling of the device is presented.
43 citations
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16 Mar 1998TL;DR: In this article, a vertical-cavity surface-emitting laser can be constructed to produce single-mode tunable laser oscillation and signal wavelength conversion using a fiber grating.
Abstract: A semiconductor light-emitting device having an optical cavity with a fiber grating. A vertical-cavity-surface-emitting laser can be constructed to produce single-mode tunable laser oscillation and signal wavelength conversion.
43 citations
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TL;DR: An optically pumped semiconductor disk laser based on the (AlGaIn)(AsSb) material system, which operates at an emission wavelength of 2.8 μm is demonstrated.
Abstract: We demonstrate an optically pumped semiconductor disk laser based on the (AlGaIn)(AsSb) material system, which operates at an emission wavelength of 2.8 μm. Up to 120 mW of output power were obtained in cw operation and more than 500 mW in pulsed mode. The performance of the present laser is discussed in comparison to shorter-wavelength semiconductor disk lasers based on the same materials system.
43 citations
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TL;DR: In this article, the gain and phase recovery dynamics of quantum-dot (QD) optical amplifiers are calculated, including all the optical transitions involved in successive carrier recovery processes.
Abstract: The gain and phase recovery dynamics of quantum-dot (QD) semiconductor optical amplifiers are calculated, including all the optical transitions involved in successive carrier recovery processes. The carrier recovery dynamics of inhomogeneously broadened QDs is simulated by solving 1088 coupled rate equations. The respective contributions of QD states and quantum-well carrier reservoirs to the gain and phase changes are identified both temporally and spectrally. We show that the slow phase recovery component of the QD ground state is induced by the slow carrier dynamics of the carrier reservoir due to a slowly varying line shape function of the refractive index change.
43 citations