Linewidths of InGaAs-GaAs-AlGaAs DBR Lasers with Varied DBR Reflectivities

摘要

The Linewidths of InGaAs-GaAs-AlGaAs DBR lasers with varied DBR dimension parameters are measured and analyzed. These lasers were built with different length and depth for their DBR gratings in order to explore the effect of the size of the DBR on its coupling coefficient and reflectivity, and hence on the Linewidth of the laser diodes. The linewidth measurement were conducted by employing a self heterodyne linewidth measurement system. The experimental and calculated data for DBR reflectivity and spectral linewidth are furnished. The relationship between these data and the dimensions of DBR are analyzed . Based on this, the effect of the DBR geometry on the linewidth of the lasers is explored. The results gives useful information and data to the design and fabrication of such type DBR lasers.