Agilent Technologies 86038A User Manual page 53

Description of the 86038A Measurement Concepts
measurement by taking larger wavelength steps or by moving the slider
controls. If phase wrapping occurs, you can identify it by the change in the
shape of the group delay curve compared to the earlier conditions.
A second approach to choosing appropriate setup parameters is to check
your values using the equations and graphs presented earlier in this
section. For example, if the device is expected to exhibit fine group delay
ripple of a particular wavelength period, select a wavelength step and
modulation frequency from Figure 8.
Suggested reading:
Fiber Optic Test and Measurement (Derickson Ed.)
T.Niemi et al., "Limitations of the phase shift method in measuring dense
group delay ripple in fiber Bragg gratings", IEEE Photonics Technology
Leltters, vol.13, no.12, p.1334, December 2001.
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Agilent 86038A Optical Dispersion Analyzer, Third Edition