Title :
Dynamic measurements on narrow linewidth complex coupled 1.55 μm DFB lasers with gain and index grating in antiphase
Author :
Schreiner, R. ; Mulot, M. ; Wiedmann, J. ; Coenning, W. ; Porsche, J. ; Gentner, J.L. ; Berroth, M. ; Scholz, F. ; Schwizer, H.
Author_Institution :
4. Phys. Inst., Stuttgart Univ., Germany
Abstract :
We report on dynamic measurements on antiphase complex coupled 1.55 μm DFB lasers. The antiphase complex coupling mechanism is realized by periodically etching the active layer and quarternary InGaAsP overgrowth. This new fabrication approach results in very narrow linewidths measured on devices with rather short resonator lengths. The minimum linewidth for a 375 μm long ridge waveguide laser was only 250 kHz at an optical output power of 4 mW. The RC-limited 3dB-bandwidth for those devices was ~6 GHz. Using circuit model corrections, the intrinsic bandwidth limitation of those lasers was found to be 17.4 GHz
Keywords :
diffraction gratings; distributed feedback lasers; etching; laser transitions; optical fabrication; quantum well lasers; ridge waveguides; semiconductor growth; spectral line breadth; waveguide lasers; 1.55 mum; 17.4 GHz; 375 mum; 4 mW; 6 GHz; DFB laser gain; InGaAsP; active layer; antiphase; antiphase complex coupling mechanism; circuit model correction; dynamic measurements; index grating; intrinsic bandwidth limitation; minimum linewidth; narrow linewidth complex; optical fabrication approach; optical output power; periodically etching; quartrnmary InGaAsP overgrowth; ridge waveguide laser; short resonator lengths; very narrow linewidths; Etching; Laser modes; Length measurement; Optical coupling; Optical device fabrication; Optical resonators; Optical waveguides; Power generation; Power lasers; Waveguide lasers;
Conference_Titel :
Indium Phosphide and Related Materials, 1999. IPRM. 1999 Eleventh International Conference on
Conference_Location :
Davos
Print_ISBN :
0-7803-5562-8
DOI :
10.1109/ICIPRM.1999.773626
