Title :
Heterodyne Method for Time Resolved Spectral Analysis of Fast Laser Wavelength Switching
Author :
Engelstaedter, J.P. ; Roycroft, B. ; Peters, F.H. ; Corbett, B.
Abstract :
We present a highly sensitive heterodyne method for time resolved optical spectrum analysis of fast laser wavelength switching. The method achieves signal-to-noise ratios in excess of 50 dB and allows, for the first time, the direct measurement of the dynamic sidemode suppression ratio during fast laser channel transitions. Wavelength range and accuracy are determined by the reference external cavity laser, while temporal and wavelength resolution are set by electronic filtering.
Keywords :
Filtering; Laser transitions; Optical filters; Optical mixing; Optical sensors; Signal resolution; Signal to noise ratio; Spectral analysis; Time measurement; Wavelength measurement; Dynamic sidemode suppression ratio (SMSR); heterodyning; laser measurements; time resolved spectra;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2028895
