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http://dx.doi.org/10.3807/KJOP.2003.14.4.413

Power extraction efficiency and lasing wavelength distribution of index-coupled DEB lasers above-threshold for various facet reflectivity combinations  

김상택 (숭실대학교 정보통신전자공학부)
김부균 (숭실대학교 정보통신전자공학부)
Publication Information
Korean Journal of Optics and Photonics / v.14, no.4, 2003 , pp. 413-422 More about this Journal
Abstract
We have calculated the power extraction efficiency and the lasing wavelength distribution of index-coupled DFB lasers at threshold for various kL and facet reflectivity combinations, and compared with those above-threshold. The power extraction efficiency increases as the asymmetry of the facet reflectivities increases. The power extraction efficiency above-threshold is slightly larger than that at threshold. Since the relative photon density around the center region increases as kL increases, the power extraction efficiency decreases. The uniformity of the distribution of lasing wavelength over the stop band increases due to the relief of mode degeneracy as the asymmetry of the facet reflectivities increases. In the case of AR-HR combination, the lasing wavelength distributions at threshold are similar to those above-threshold. However, in the case of AR-AR combination, the lasing wavelength at threshold is concentrated on both edges of the stop band, while it is concentrated only on the longer wavelength edge above-threshold. As kL increases, the range of the lasing wavelength distribution increases due to the increase of the stop band. The effect of AR reflectivity on the power extraction and the lasing wavelength distribution is very weak.
Keywords
index-coupled DFB lasers; power extraction efficiency; lasing wavelength distribution; above-threshold;
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