DocumentCode :
929365
Title :
Direct Frequency Modulation In AlGaAs Semiconductor Lasers
Author :
Kobayashi, S. ; Yamamoto, Yoshihisa ; Ito, Minoru ; Kimura, Tatsuya
Volume :
30
Issue :
4
fYear :
1982
Firstpage :
428
Lastpage :
441
Abstract :
Direct frequency modulation characteristics in three different AlGaAs lasers - a channeled-substrate planar (CSP) laser, a buried-heterostructure (BH) laser, and a transverse-junction-stripe (TJS) laser- are studied theoretically and experimentally. Experimental FM responses are measured by using the Fabry-Perot interferometer and birefringent optical filters in the 0-5.2 GHz modulation frequency region. Experimental FM response dependence on modulation frequency, dc bias level, and stripe structure are successfully explained by the theoretical analyses considering both the carrier density modulation effect and the temperature change effect. FM response in the low modulation frequency region from 0 to 10 MHz, gradually decreasing with the modulation frequency, stems from the thermal effect. FM response in the high modulation frequency region from 10 MHz to 5.2 GHz is caused by the carrier effect. A flat FM response of several hundred MHz per 1 mA is observed in the CSP and TJS lasers, but a V-shaped FM response is obtained in the BH laser. Resonance peak due to relaxation oscillation and cutoff characteristics are observed in several gigahertz regions. Weak lateral mode confinement, strong vertical mode confinement, carrier injection outside the effective core region, and p-side down mounts are effective ways to achieve a flat and efficient FM response with a small spurious intensity modulation.
Keywords :
Birefringence; Carrier confinement; Fabry-Perot interferometers; Frequency measurement; Frequency modulation; Laser beam cutting; Laser modes; Laser theory; Optical filters; Semiconductor lasers;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.1982.1131084
Filename :
1131084
Link To Document :
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