User`s guide

Optional Performance Tests Performance Tests
Agilent 81600B Tunable Laser Source Family, Fourth Edition 145
Normalized Sweep Acceleration
The determination of this parameter is extremely complex and cannot be
done manually. It requires Fourier and Hilbert Transformation that can only
be done by means of sophisticated mathematics. The associated test can
only be done by use of specific software tools which are available in
dedicated Agilent service centers.
Principal Measurement Setup:
Figure 44 Measurement Setup to Determine the Sweep Speed
The measurement of the sweep speed is performed in the following
manner:
The TLS performs a continuous sweep with a constant output power. The
laser signal enters a Michelson Interferometer, which splits the beam into
two equal parts. These travel over different paths and are reflected from
Faraday mirrors (thus inverting the polarization). The reflected rays
interfere at the coupler and produce an interferogram at the powermeter
depending on destructive or additive interference. Afterwards, all data is
transferred to the host PC, which starts the analysis of the interferogram
from which the parameter Normalized Sweep Acceleration is determined.