A Directly-Written Monolithic Waveguide-Laser Incorporating a DFB   Waveguide-Bragg Grating
  We report the fabrication and performance of the first C-band directly-written monolithic waveguide-laser. The waveguide-laser device was created in an Erbium and Ytterbium doped phosphate glass host and consisted of an optical waveguide that included a distributed feedback Bragg grating structure. The femtosecond laser direct-write technique was used to create both the waveguide and the waveguide-Bragg grating simultaneously and in a single processing step. The waveguide-laser was optically pumped at approximately 980 nm and lased at 1537nm with a bandwidth of less than 4 pm. 
Graham D. Marshall, Peter Dekker, Martin Ams, James A. Piper, and   Michael J. Withford