High-performance 1300-nm InAs/GaAs quantum-dot lasers

H. Y. Liu; M. Hopkinson; K. Groom; R. A. Hogg; D. J. Mowbray

doi:10.1117/12.765735

29 January 2008 High-performance 1300-nm InAs/GaAs quantum-dot lasers

H. Y. Liu, M. Hopkinson, K. Groom, R. A. Hogg, D. J. Mowbray

Proceedings Volume 6909, Novel In-Plane Semiconductor Lasers VII; 690903 (2008) https://doi.org/10.1117/12.765735
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

Quantum dot (QD) lasers incorporating the dot-in-a-well (DWELL) structures offer the prospect of lowcost and high-performance sources for telecom applications at 1300 nm. A number of significant advantages have been demonstrated to arise from the 0-D density of states, such as low threshold, low noise, low chirp and relative temperature insensitivity. However QD lasers suffer from a low modal gain per dot layer, which is a major factor of limiting high-speed performance. To address this, both a high inplane dot density and the use of multilayer structure are necessary and this presents a major challenge for molecular beam epitaxy (MBE) growth. In this work, to increase the gain of 1300-nm quantum-dot (QD) lasers, we first optimize the MBE growth of InAs/InGaAs QD structure for single-layer epitaxy structure with In composition within InGaAs well. Then we proposed a growth technique, high-growthtemperature spacer layer to suppress the dislocation formation for the multilayer QD structure. These lead to the realization of high-performance multilayer 1300-nm QD lasers with extremely low threshold current density (Jth) of 17 A/cm² at room temperature (RT) under continuous-wave (cw) operation and high output power of over 100 mW. By combining the high-growth-temperature spacer layer technique with the p-type modulation doping structure, a negative characteristic temperature above RT has been demonstrated for a 5-layer QD laser structure. Further modification of the high-growth-temperature spacer layer technique, we realized a very low RT threshold current density of 33 A/cm² for a 7-layer ptype- modulated QD laser. The temperature coefficient of ~0.11 nm/K over the temperature range from 20 to 130 °C has also been realized by modifying the strain profile of InGaAs capping layer. These techniques could find application in lasers designed for optical fiber systems.

Citation Download Citation

H. Y. Liu, M. Hopkinson, K. Groom, R. A. Hogg, and D. J. Mowbray "High-performance 1300-nm InAs/GaAs quantum-dot lasers", Proc. SPIE 6909, Novel In-Plane Semiconductor Lasers VII, 690903 (29 January 2008); https://doi.org/10.1117/12.765735

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