Experimental method based on wavelength-modulation spectroscopy for the characterization of semiconductor lasers under direct modulation

An experimental method is presented for characterization of the combined intensity and frequency modulation produced when the injection current of a laser diode is modulated. The reported technique is based on the analysis of the harmonic signals produced when a modulated laser is used to probe a gas absorption line by the so-called wavelength-modulation spectroscopy method. Based on a theoretical model of this technique, we present two methods that facilitate the determination of (i) the deviation in laser frequency and (ii) the phase shift between intensity and frequency modulation. These methods are illustrated experimentally by measurement of the modulation parameters of a 2-μm distributed-feedback laser by use of a CO2 absorption line. The experimental results have been compared with those obtained with another traditional method and have shown full agreement in the frequency range (400 Hz-30 kHz) considered


Published in:
Applied Optics, 43, 22, 4446-53
Year:
2004
Publisher:
Optical Society of America
ISSN:
0003-6935
Keywords:
Note:
Lab. of Nanophotonics & Metrol., Ecole Polytech. Fed. de Lausanne, Switzerland Copyright 2004, IEE 8162364 0003-6935 wavelength-modulation spectroscopy semiconductor lasers intensity modulation frequency modulation injection current modulation harmonic signals distributed-feedback laser CO2 absorption line 2 mum 400 Hz to 30 kHz CO2
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 Record created 2008-09-29, last modified 2018-03-18

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