Fabrication and spectral characteristics of a 1.55hyphen;mgr;m distributed feedback laser with a tunable integrated external cavity

摘要

The fabrication and lasing characteristics of a 1.5hyphen;mgr;m distributed feedback laser with a butthyphen;coupled tunable integrated resonator are described. An additional modulation of the distributed feedback laser spectrum introduced by the external cavity is clearly demonstrated. Optical bistability has been observed in the power versus tuning current characteristic. The device has a limited continuous tuning range of 4.2 Aring;. Tuning current change allows for the selection of compound cavity mode and one of the distributed feedback laser modes, while maintaining singlehyphen;mode operation. Linewidth reduction due to the integrated cavity is clearly demonstrated, and linewidths 10 MHz have been obtained.