Title :
External feedback effects on a quantum dot laterally loss coupled distributed feedback laser
Author :
Su, Hongye ; Malloy, K.J. ; Lester, L.F. ; Zhang, Leiqi ; Gray, A.L. ; Wang, Ruiqi ; Newell, T.C.
Author_Institution :
Center for High Technol. Mater., New Mexico Univ., Albuquerque, NM, USA
Abstract :
The critical external feedback ratio for coherence collapse in a quantum dot laterally loss coupled distributed feedback (QD LLC DFB) laser is determined to be -14 dB by RIN measurements. Under 2.5 Gbps modulation, the SNR in the QD DFB starts to degrade at a feedback ratio of -30 dB, about 20 dB higher than the value of a typical QW DFB, although the change in RMS jitter is not much different in these two devices. The physical contributions to the high external feedback resistance of the QD LLC DFB would be the low linewidth enhancement factor, high damping rate, HR/HR facet coatings and loss-coupled grating.
Keywords :
diffraction gratings; distributed feedback lasers; laser feedback; optical losses; optical modulation; quantum dot lasers; spectral line breadth; HR/HR facet coatings; RIN measurements; RMS jitter; coherence collapse; critical external feedback ratio; damping rate; external feedback effects; external feedback resistance; laterally loss coupled distributed feedback laser; linewidth enhancement factor; loss-coupled grating; quantum dot laser; Coatings; Damping; Degradation; Distributed feedback devices; Gratings; Jitter; Laser feedback; Loss measurement; Optical coupling; Quantum dot lasers;
Conference_Titel :
Lasers and Electro-Optics Society, 2003. LEOS 2003. The 16th Annual Meeting of the IEEE
Print_ISBN :
0-7803-7888-1
DOI :
10.1109/LEOS.2003.1251703
