Correlation measurements of intensity noise from the two facets of DFB lasers during linewidth rebroadening

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Abstract
A method to experimentally verify the importance of nonsymmetrical fluctuations of the longitudinal intensity distribution is proposed and tested on several DFB lasers. This is based on the measurement of correlation between the intensity noise from the two laser facets. The results indicate that such fluctuations, probably due to weak sidemode suppression, can play an important role in linewidth rebroadening. Linewidth floors were observed at high output powers without any noticeable correlation.