The conventional limit on real-time path-length noise suppression in optical fibers can be exceeded by optimizing the feedback signal with temporal correlations between round-trip and one-way signals, yielding 6 dB improvement in deployed urban fiber and over 10 dB in a reconfigurable lab testbed.
Prentice-Hall, Inc., Upper Saddle River, NJ, USA (1999) 28
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Redefining the limits of real-time noise cancellation in optical fiber links
The conventional limit on real-time path-length noise suppression in optical fibers can be exceeded by optimizing the feedback signal with temporal correlations between round-trip and one-way signals, yielding 6 dB improvement in deployed urban fiber and over 10 dB in a reconfigurable lab testbed.