HP 8509A User Reference Manual page 237

Wavelength Scanning PMD Measurement
Test device is a pigtailed quartz PMD standard, under development.
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Measurement wavelength range of 1500 to 1560 nm.
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Measurement wavelength interval of 10 nm.
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Reposition pigtails randomly before each measurement.
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The 0.010 ps tolerance is provided to allow for the e ects of pigtails and
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packaging.
Assumes 100 nm wavelength tuning range.
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Assumes a single peak and a single valley.
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Assumes an average of 3 cycles of polarization change (4 peaks).
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