Temperature characteristics of a vertical-cavity surface-emitting laser with a broad-gain bandwidth

Opto-Electron. Res. Labs., NEC Corp., Ibaraki
IEEE Journal of Selected Topics in Quantum Electronics (Impact Factor: 2.83). 07/1995; 1(2):654 - 660. DOI: 10.1109/2944.401254
Source: IEEE Xplore


Temperature-insensitive characteristics are of great importance in
implementing the actual applications of vertical-cavity surface-emitting
lasers (VCSEL's) because of the temperature change in the surroundings.
To extend the operational temperature range of such lasers, we
fabricated a VCSEL with a broad gain bandwidth. The active layers in
VCSEL's consist of multiple quantum wells (MQW's) with different bandgap
energies. From the change in the threshold current, with temperature as
a parameter, we found that the operational temperature range of a VCSEL
with a broad gain bandwidth is more than 20°C wider than that of
conventional VCSEL's, whose active layers consist of a single type of
MQW. We demonstrate that the extended-gain bandwidth gives better
temperature characteristics. In addition, we simulated the structure of
the active layers, and the optimized structure resulted in a 1-mW light
output power at less than 5 mA in a single transverse mode oscillation
from 20-70°C

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