Title :
Modulation frequency characteristics of directly optical frequency modulated AlGaAs semiconductor laser
Author :
Kobayashi, S. ; Yamamoto, Yusaku ; Kimura, Tomohiro
Author_Institution :
NTT, Musashino Electrical Communication Laboratory, Musashino, Japan
Abstract :
Optical frequency spectra of directly frequency modulated AlGaAs semiconductor laser in the 0¿5.2 GHz range were measured by using a Fabry-Perot interferometer and a birefringent optical filter. The frequency deviation is linearly proportional to the RF modulation current. The measured modulation frequency characteristics for the frequency deviation show that the thermal effect is predominant in the frequency below 10 MHz. It has a resonance peak which behaves just like the peak observed in the modulation. Experimental results agreed well with theoretical values calculated by considering thermal effect and carrier-dependent refractive index variation.
Keywords :
aluminium compounds; frequency modulation; gallium arsenide; optical communication equipment; optical modulation; semiconductor junction lasers; AlGaAs semiconductor laser; FM; Fabry-Perot interferometer; birefringent optical filter; carrier-dependent refractive index variation; characteristics; direct optical frequency modulated lasers; frequency range 0 to 5.2 GHz; optical communication equipment; optical modulation; semiconductor junction lasers; thermal effect;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19810247
