Measurements of frequency responses of three-section distributed Bragg reflector lasers and application to modulation spectroscopy

摘要

The feasibility for wavelength modulation spectroscopy using a three-section distributed Bragg reflector (DBR) laser modulated at the phase section has been investigated. The FM and AM responses have been measured versus frequency from de to 3 GHz at various positions on the tuning curve. The modulation efficiency as a function of the tuning currents combined with modulation frequency has been studied. In particular the behaviour at the positions of laser mode jumps has been emphasised as well as consistency of the recorded spectra across the entire tuning range, These tests were performed with a tuneable Fabry-Perot filter. The operation conditions were adapted for high and sustained FM response for modulation spectroscopy over a wide wavelength range. A conventional Bragg grating is used as an example of practical application. (C) 1999 Elsevier Science Ltd. All rights reserved. [References: 8]