Optical and electrical low-frequency noise and their correlation in InGaAsP MQW lasers

The optical and electrical low-frequency noise spectra and their correlation factor of multiple quantum well strained-layer Fabry-Perot (F-P) and distributed-feedback (DFB) InGaAsP/InP laser diodes have been investigated as a function of temperature and current. Particular attention has been given to the optical and electrical fluctuations due to mode-hopping effects, which are observed in the F-P lasers at specific currents and temperatures. Both the electrical and optical noise during mode hopping have a Lorentzian type spectrum, and are very strongly correlated and very sensitive to temperature and optical feedback.