The influence of mode nonorthogonality on the correlation function of the intensity fluctuation and of the amplitude that determines laser linewidth as well as the coherence of light is investigated. The semiclassical approach based on a time-dependent solution of the Fokker–Planck equation is used. Numerical results obtained for a distributed-feedback laser with nonvanishing end reflectivity and a complex coupling coefficient reveal the difference between the standard approach (for orthogonal modes) and the more realistic model (mode nonorthogonality included).

© 1996 Optical Society of America

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