Abstract
Experimental results are presented for the first time of Q penalties resulting
from multiple passes through commonly available fixed optical add-drop multiplexers
(OADMs) in a 50-GHz channel plan at 10 Gbit/s. We find that transmission through
>6 OADMs is feasible within a laser center frequency range of ±2.5 GHz with a Q
penalty of <1 dB. We find expressions for the Q penalty contributions from
distortion-induced eye closure and optical signal-to-noise ratio (OSNR) degradation
and show that the predicted penalty functions from these components fit very well
the measured Q penalty as a function of laser-frequency offset within a filter
passband. Both contributions are necessary for accurately predicting the total Q
penalty.
© 2004 Optical Society of America
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