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.
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TL;DR: In this paper, the influence of spontaneous recombination mechanism and the temperature and wavelength-dependent material gain on the performance of 1.3-μm InGaAsP traveling-wave semiconductor laser amplifiers is analyzed.
Abstract: The influence of the spontaneous recombination mechanism and the temperature- and wavelength-dependent material gain on the performance of 1.3-μm InGaAsP traveling-wave semiconductor laser amplifiers is analyzed. Measurements of signal gain are presented. Frequency detuning and optical bandwidth characteristics are discussed. By considering the trade-off between optical bandwidth and resonant signal gain, guidelines for the requirements to the facet reflectivity are given.
42 citations
TL;DR: In this article, a transverse-magnetic (TM)-mode dominated gain at the 1.5μm wavelength in semiconductor optical amplifiers with columnar quantum dots (QDs) was demonstrated.
Abstract: We demonstrated transverse-magnetic (TM)-mode dominated gain at the 1.5μm wavelength in semiconductor optical amplifiers (SOAs) with columnar quantum dots (QDs). We show that we can control the polarization dependence of optical gain in QD-SOAs by changing the height and tensile-strained barrier of columnar QDs. The TM mode gain is 17.3dB and a gain of over 10dB was attained over a wide wavelength range of 200nm. The saturation output power is 19.5dBm at 1.55μm.
42 citations
TL;DR: In this paper, the authors investigated the effect of reflections from optical fiber junctions and compact disks on the performance of semiconductor laser elements and proposed a method to uncover the origin of these reflections.
Abstract: Semiconductor lasers with delayed optical feedback display a complex variety of dynamical behaviors governed by the deterministic, nonlinear interaction between the electromagnetic field and the semiconducting material, and noise arising from the quantum-mechanical process of spontaneous emission of photons @1#. This situation arises when the beam generated by the laser reflects from a distant surface and is reinjected into the laser. The specific type of behavior depends sensitively on the laser-surface distance and the reflectivity of the surface. Reflectivities as low as 10 26 , such as that arising from spurious reflections from optical fiber junctions or compact disks, can significantly alter the laser dynamics. From a practical perspective, the performance of devices based on semiconductor laser elements is often degraded by these effects; hence it is important to uncover their origin so they can be avoided or dynamically con
42 citations
TL;DR: In this paper, a novel technique to improve an analog optical transmission performance by reducing both the nonlinearity and chromatic dispersion induced carrier suppression has been proposed, where the intrinsic nonlinear distortion component of MZM was reduced by gain saturation characteristics of semiconductor optical amplifier (SOA).
Abstract: A novel technique to improve an analog optical transmission performance by reducing both the nonlinearity and chromatic dispersion induced carrier suppression has been proposed. The intrinsic nonlinear distortion component of Mach-Zehnder modulator (MZM) was reduced by gain saturation characteristics of semiconductor optical amplifier (SOA). The composite triple beat (CTB) of MZM was reduced as much as 9 dB at the quadratic bias point and the following enhancement of dynamic range by 4.5 dB was obtained. The RF carrier suppression for the transmission length and operating frequency was reduced by a negative chirp characteristic of semiconductor optical amplifier (SOA) and the enhancement of CTB after transmission were also achieved as a result of the linearization using SOA.
42 citations
TL;DR: In this paper, the authors show experimentally and theoretically that the bandwidth for wavelength conversion through cross-gain modulation varies approximately linearly with the length of the amplifier, and that by cascading two similar semiconductor optical amplifiers, the small-signal wavelength conversion bandwidth is doubled.
Abstract: The authors show experimentally and theoretically that the bandwidth for wavelength conversion through cross-gain modulation varies approximately linearly with the length of the amplifier. By cascading two similar semiconductor optical amplifiers, the small-signal wavelength conversion bandwidth is doubled.
42 citations