Title :
Monolithic dual wavelength DFB lasers for narrow linewidth heterodyne beat-note generation
Author :
Van Dijk, Frédéric ; Accard, Alain ; Enard, Alain ; Drisse, Olivier ; Make, Dalila ; Lelarge, François
Author_Institution :
III-V Lab., Alcatel-Thales, Palaiseau, France
Abstract :
We have developed a dual wavelength DFB laser for the generation of a widely tunable microwave signal. In order to obtain a narrow linewidth of the generated signal, we have focused the development of the source on the reduction of the linewidth of each generated wavelengths. The best results were obtained with a device using 2500 μm long DFB sections that generated linewidths narrower than 300 kHz. Beating the two wavelengths from this chip on a photodetector resulted in a beat note having a linewidth of 600 kHz. This microwave signal could be tuned from 3 to 20 GHz with a linewidth kept below 1 MHz.
Keywords :
distributed feedback lasers; laser tuning; frequency 600 kHz; heterodyne beat note generation; monolithic dual wavelength DFB lasers; narrow linewidth; widely tunable microwave signal; Current measurement; Optical device fabrication; Optical fibers; Optical interferometry; Optical mixing; Optical reflection; Optical variables measurement; Distributed feedback lasers; microwave generation; microwave/millimeter wave; optical heterodyning; semiconductor lasers; spectral linewidth;
Conference_Titel :
Microwave Photonics, 2011 International Topical Meeting on & Microwave Photonics Conference, 2011 Asia-Pacific, MWP/APMP
Conference_Location :
Singapore
Print_ISBN :
978-1-61284-716-0
DOI :
10.1109/MWP.2011.6088672
