Abstract
The validity of the method of estimating nonuniformity in axial photon distribution from front-to-rear output power ratio has been studied by an effective index transfer matrix method. The correlation between the front-to-rear output power ratio and the maximum-to-minimum photon density ratio is shown to be good over the whole useful range of the grating coupling coefficient in uniform grating DFB laser with low-reflection/high-reflection facets, and an accurate estimation is possible. However, the correlation becomes poor as the reflectivity of the high-reflection facet decreases and the coupling coefficient increases, resulting in poor estimation.
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