
corrections seem to capture the steeper (in comparison with Eqn (17.9)) rise seen
in the commercial receiver. Note that
1dB
= (" = 1dB)= 28, 31, 36 ps are about
a third of the bit period for all the models. Presumably, future technological
advances will extend this limit. However, it is hard to envision a dramatic change
in
1dB
for systems without PMD compensation
*
.
The emergence of electronic PMD mitigation techniques in recent years, such
as multiple likelihood sequence estimation (MLSE) [43] has resulted in relatively
more tolerant PMD receivers with
1dB
= 48 ps at 10 Gb/s [44, 45]. While the
economic impact of such improvement is enormous, we