Back to Search
Start Over
Large Signal Modulation Characteristics in the Transition Regime for Two-State Lasing Quantum Dot Lasers
- Source :
- Chinese Physics Letters. 33:124204
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- Large-signal modulation capability, as an important performance indicator, is directly related to the high-speed optical communication technology involved. We experimentally and theoretically investigate the large-signal modulation characteristics of the simultaneous ground-state (GS) and the excited-state (ES) lasing in InAs/GaAs quantum dot laser diodes. The large-signal modulation capability of total light intensity in the transition regime from GS lasing to two-state lasing is unchanged as the bias-current increases. However, GS and ES large-signal eye diagrams show obvious variations during the transition. Relaxation oscillations and large-signal eye diagrams for GS, ES, and total light intensities are numerically simulated and analyzed in detail by using a rate-equation model. The findings show that a complementary relationship between the light intensities for GS and ES lasing exists in both the transition regime and the two-state lasing regime, leading to a much smaller overshooting power and a shorter settling time for the total light intensity. Therefore, the eye diagrams of GS or ES lasing are diffuse whereas those of total light intensity are constant as the bias-current increases in the transition regime.
- Subjects :
- 010302 applied physics
Physics
Settling time
business.industry
Relaxation (NMR)
Optical communication
Physics::Optics
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Light intensity
Modulation
Quantum dot laser
0103 physical sciences
Optoelectronics
Atomic physics
0210 nano-technology
business
Lasing threshold
Diode
Subjects
Details
- ISSN :
- 17413540 and 0256307X
- Volume :
- 33
- Database :
- OpenAIRE
- Journal :
- Chinese Physics Letters
- Accession number :
- edsair.doi...........ef0480b3abef54526031576a297b5161