Abstract
A new approach to the analysis of amplified spontaneous emission (ASE)
spectra, based on the least-squared fitting, is proposed for characterization
of broad-band multilayer antireflection (AR) coatings and semiconductor
optical amplifiers (SOAs). The model formula for ASE spectra contains eight
fitting parameters, representing the parabolic approximation of spontaneous
emission and gain spectra, together with the linear approximation of
refractive index dispersion. By zone fitting to the segmented experimental
data after AR coating,a stepwise reflectivity estimate is obtained.
Double-layer AR-coated 1.3 µm InGaAsP MQW SOAs were fabricated and
evaluated. For the best samples, minimum reflectivities on the order of 10-6
and bandwidths (for R < 1 x 10-4) of about 50 nm were reproducibly
obtained. Reliability of the analysis procedure was checked on the basis of
relevance of various physical parameters, bias current dependence, and
reproducibility of the extrapolation procedure. Being noise-resistant and
applicable to wider spectral range, the new method is confirmed to be a
significant improvement over the standard ASE analysis procedure (i.e., the
conventional Hakki-Paoli (HP) method).
© 2000 IEEE
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