HP 8509A User Reference Manual page 238

Comparison Between Jones Matrix Eigenanalysis
and Wavelength Scanning Methods
The test device was 14 km of loosely-spooled, dispersion-shifted ber. Eleven measurements of each
1
type were taken with random arrangements of the loose turns of the ber.
Wavelength scanning responses typically exhibited 16 extrema (# of extrema = # of peaks + # of
2
valleys).
Wavelength scanning measurements use mode coupling factor of 0.82.
3
1 , 2 , 3