| Autor: |
H. Walter, H. Burkhard, S. Mohrdiek |
| Rok vydání: |
1994 |
| Předmět: |
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| Zdroj: |
Journal of Lightwave Technology. 12:418-424 |
| ISSN: |
0733-8724 |
| DOI: |
10.1109/50.285323 |
| Popis: |
The influence of strong light injection on the reduction of the dynamical linewidth broadening of directly current-modulated semiconductor lasers at high bit rates is theoretically investigated and experimentally verified for 10 Gb/s NRZ pseudorandom modulation with a large current swing of 40 mA pp. Significant chirp reduction and single-mode operation are observed for bulk DFB, quantum well DFB lasers at 10 Gb/s and a weakly coupled bulk DFB laser at 8 Gb/s, so that an improvement of the transmission performance using standard monomode fibers in the 1.55 /spl mu/m low-loss wavelength region can be achieved for all these laser types, where dispersion otherwise causes severe penalties for long-haul transmission. The properties of injection-locked bulk DFB and quantum well DFB lasers with respect to high bit rate modulation have been systematically studied by the use of the rate equation formalism. A dynamically stable locking range of more than 30 GHz under modulation has been found for both laser types with injection ratios higher than 0.5. > |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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