SOLGEL GRATING WAVEGUIDES FOR DISTRIBUTED BRAGG REFLECTOR LASERS

Solgel grating waveguides and their application to the fabrication of external-cavity distributed Bragg reflector (DBR) lasers are demonstrated. A new composition of aluminosilicate material is developed for the fabrication of single-mode waveguides and Bragg reflectors. An average loss of <0.2 dB/cm is measured in the single-mode waveguides at 1550??nm. The reflectors show filtering greater than 97% near 1530??nm, with a bandwidth of ?0.6 nm. The Bragg reflectors are used as feedback resonators for DBR lasers. Single-mode lasing with a sidemode suppression of better than 25??dB is demonstrated.