Analysis of mode-hopping effect in fabry-perot laser diodes

Mode-hopping effect in Fabry-Perot laser diode (LD) operation was investigated. Radiation spectra and noise characteristics (optical and electrical fluctuations and their simultaneous cross-correlation factor) are measured under stable and mode-hopping operation of the LD. At mode-hopping point LD radiation spectrum is unstable, highly correlated intensive Lorentzian-type optical and electrical fluctuations are observed. Different cross-correlation factor value and sign (positive or negative) is observed for mode-hopping noise peaks at different LD operation conditions. Origin of the intensive Lorentzian-type fluctuations during mode hopping is caused due to generation-recombination processes in defects in barrier layers.