Influence of the Spectral Gain Suppression on the Intensities of Longitudinal Modes in 1.55 µm InGaAsP Lasers.

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Bibliographic Details
Title:	Influence of the Spectral Gain Suppression on the Intensities of Longitudinal Modes in 1.55 µm InGaAsP Lasers.
Authors:	Ahmed, Moustafa F.¹, Mahmoud, Safwat W. Z.¹, Yamada, Minoru²
Source:	Egyptian Journal of Solids. 2003, Vol. 26 Issue 2, p205-224. 20p. 1 Chart, 4 Graphs, 1 Map.
Subjects:	Spectrum analysis, Lasers, Perturbation theory, Equations, Numerical analysis
Abstract:	The self-suppression and both symmetric and asymmetric cross-suppressions of the gain of longitudinal modes have been analyzed in InGaAsP lasers emitting in wavelength of 1.55 µm based on a third-order perturbation approach. We compared the influences of such suppression effects of gain on the time variations of the mode intensities and the associated output spectra. Such study was based on numerical integration of the laser rate equations in a multi-mode model. Based on intensive simulations of mode dynamics, we explored the operating regions of the single- and multi-mode operations over a long scale of the strength of the asymmetric gain suppression. The results showed that the competition among the modes induces normal multimode operation under self suppression, single-mode operation in the central mode of the gain spectrum under symmetric cross-suppression, and single-mode operation with jumping of the lasing mode to the long-wavelength side of the spectrum under asymmetric gain suppression. When the asymmetric gain suppression is enhanced, transient multi-mode switching is stimulated showing asymmetric multi-mode output spectra in good correspondence with experimental results. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	The self-suppression and both symmetric and asymmetric cross-suppressions of the gain of longitudinal modes have been analyzed in InGaAsP lasers emitting in wavelength of 1.55 µm based on a third-order perturbation approach. We compared the influences of such suppression effects of gain on the time variations of the mode intensities and the associated output spectra. Such study was based on numerical integration of the laser rate equations in a multi-mode model. Based on intensive simulations of mode dynamics, we explored the operating regions of the single- and multi-mode operations over a long scale of the strength of the asymmetric gain suppression. The results showed that the competition among the modes induces normal multimode operation under self suppression, single-mode operation in the central mode of the gain spectrum under symmetric cross-suppression, and single-mode operation with jumping of the lasing mode to the long-wavelength side of the spectrum under asymmetric gain suppression. When the asymmetric gain suppression is enhanced, transient multi-mode switching is stimulated showing asymmetric multi-mode output spectra in good correspondence with experimental results. [ABSTRACT FROM AUTHOR]
ISSN:	10125566
DOI:	10.21608/ejs.2003.150159