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Stefano and all,
thank
you for the comment, but the statement reads: "linear
polarization is lost"
That war reported
byDavid. It is not
possible to detect a polarization with a
single polarizer, in other words that there is no linear
polarization left!
The explaination may be as follows (which was not discussed in
detail in the
telco):
The linear polarization of the launch is turned into circular
polarization because of the birefringence (which is caused by the mechanical
stress in the fiber) after some meter of fiber. This circular polarization will
be existent in some modifications
even over a long piece of fiber and therefore you can influence the
signal on longer fiber pieces (That observation was already stated by
David).
This result is similar to our
observations. We tested transmission even with circular polarized
launch and the result was that we see similar effects as with linear
polarization. That fits completely with the explaination
above.
Joerg
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