Title :
Reduction of laser chirp in 1.5 μm DFB lasers by modulation pulse shaping
Author :
Bickers, L. ; Westbrook, L.D.
Author_Institution :
British Telecom Research Laboratories, Ipswich, UK
Abstract :
The dynamic linewidth of 1.5 μm ridge waveguide DFB lasers is shown to be reduced by shaping the pulse of the laser modulating waveform. Pulse shaping is performed by a second-order network designed to cancel the small-signal laser resonance. Results demonstrate a dynamic linewidth reduction from 1.4 Ã… to 0.55 Ã… FWHM for a 500 ps pulse.
Keywords :
distributed feedback lasers; optical modulation; pulse shaping circuits; spectral line breadth; 1.5 micron laser; dynamic linewidth; laser chirp; modulation pulse shaping; ridge waveguide DFB lasers; second-order network; small-signal laser resonance;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850071
