Abstract

Gain, linewidth enhancement factor, and refractive index changes are crucial design parameters for semiconductor laser diodes. Accurate knowledge of the line-width enhancement factor is particularly important for designing low-chirp, highspeed, long-wevelength laser diodes. Recently, Fabry-Perot (FP) mode spectrum was used to get the gain profile of a high-speed long-wavelength laser diode.¹ This, so-called Haki-Paolr² method, is relatively simple to implement. However, it gives FP mode spectrum in rather limited spectral range and care must be used to get the minimum and maximum values of the spectrum.

© 1996 Optical Society of America