Construction of a semiconductor optical amplifier from a Fabry-Perot semiconductor

A methodology to convert a semiconductor laser Fabry-Perot (SL-FP) in a sem iconductor optical amplifier (SOA) is presented. In order to supress the ca vity resonant an optical thin film coating was deposited on the facets:of t he SL-FP. The experiment was carried out putting on service a new, monitori ng technique that consist in the observation of the laser power spectrum du ring the antireflection coatings deposition. This allows to determine the m oment where the facets reflectivity is minimum. The SOA obtained was charac terized for different polarizartion currents.