Re. Schuh et As. Siddiqui, SINGLE-CHANNEL POLARIMETRIC OTDR FOR MEASUREMENT OF BACKSCATTERED SOPEVOLUTION ALONG A FIBER WITH TWIST, Electronics Letters, 33(25), 1997, pp. 2153-2154
The authors show how the state of polarisation (SOP) evolution along a
n optical fibre can be measured non-destructively by using a commercia
l OTDR modified to act as a single channel polarimetric OTDR (POTDR).
From the SOP evolution, the linear birefringence and twist can be calc
ulated along the fibre, thus identifying fibre sections with relativel
y high and low polarisation mode dispersion (PMD).