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Detailed experimental study of high-frequency self-pulsation domains in multi-section DFB-lasers

: Hoffmann, D.; Brox, O.; Sahin, G.; Möhrle, M.; Sartorius, B.

Optical Society of America -OSA-, Washington/D.C.; IEEE Lasers and Electro-Optics Society:
Integrated Photonics Research 2000. Postconference edition : July 12 - 15, 2000, Québec Hilton Hotel, Québec, Canada
Washington, DC: OSA, 2000 (OSA trends in optics and photonic series 45)
ISBN: 1-557-52644-3
Conference "Integrated Photonics Research" <2000, Quebec>
Fraunhofer HHI ()
distributed feedback lasers; q-switching; semiconductor lasers; waveguide lasers; high-frequency self-pulsation domains; multi-section dfb-lasers; pulsation; three-section dfb-laser; continuous pulsation domains; geometrical parameters; pulsation frequency; rf-amplitude; wavelength; optical power; fabrication; phase section; self-pulsations; negative reflectivity slope; dispersive q-switching; reflector; heterostructure; 200 to 500 micron; 90 to 200 micron; 1.55 micron; InGaAsP-InP

We establish an extensive experimental registration technique to study the dependence of the pulsation in a three-section DFB-laser. The common feature of continuous pulsation domains is highlighted and the impact of geometrical parameters is investigated. The measurements allow the quantitative determination of pulsation frequency, rf-amplitude, wavelength and optical power at the same time. Based on a reproducible fabrication technology, we found that the phase section plays the main role to control the self-pulsations. The phase section also exhibits a negative reflectivity slope necessary for dispersive Q-switching like the reflector. Phase section lengths in the range between 200 and 500 mu m are very well suited. The length of the reflector section is not very critical Devices with 90 mu m and 200 mu m long reflectors work well. Other parameters that are responsible for the frequency of self-pulsations are determined by the heterostructure and must be optimized separately.