Longitudinal mode spectrum of semiconductor lasers under high-speed modulation
Abstract
Experimental observations of the lasing spectrum of a single-mode semiconductor laser under continuous microwave modulation reveal that the lasing spectrum is apparently locked to a single-longitudinal mode for optical modulation depths up to approximately 80 percent, beyond which the lasing spectrum breaks into multimode oscillation. The width of the envelope of the multimode spectrum increases very rapidly with further increase in modulation depth. These results are satisfactorily explained by a theoretical treatment which gives simple analytic results for the time evolution of the individual longitudinal modes. It also yields considerable insight into spectral dynamics, and enables one to predict the dynamic lasing spectrum of a laser from its CW lasing spectra at various output powers. The results can also be used to predict the amount of spectral envelope broadening under single of pseudorandom pulse modulation.
- Publication:
-
IEEE Journal of Quantum Electronics
- Pub Date:
- January 1984
- DOI:
- 10.1109/JQE.1984.1072274
- Bibcode:
- 1984IJQE...20...71L
- Keywords:
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- Continuous Wave Lasers;
- Laser Modes;
- Laser Outputs;
- Light Modulation;
- Multimode Resonators;
- Semiconductor Lasers;
- Heterojunction Devices;
- Lasing;
- Microwave Spectra;
- Pulse Frequency Modulation;
- Spectrum Analysis;
- Lasers and Masers