MODELING NOISE AND MODULATION PERFORMANCE OF FIBER GRATING EXTERNAL-CAVITY LASERS

A detailed model is developed for analyzing fiber grating external cav ity lasers for both static and small signal modulation conditions, The chip and package parasitics and leakage current induced distortion ar e included, The composite system is solved analytically in the small-s ignal regime using a Volterra functional series expansion method. As a n application of the model, a thorough analysis of the appearance of n ulls close to the harmonics of the cavity resonance frequency in the n oise and modulation spectra is given, We show that the appearance of t hese nulls can be explained using the interplay of amplitude and phase coupling between laser diode and external resonant cavity, A signal h ow graph approach is introduced which identifies methods of minimizing the nulls.