Abstract
It is shown that strong optical filters that are included in a ULH system can suppress, or enhance amplitude noise depending on their positioning. Our study explains the improvement measured in a 60-span system with 10 band-limited DGEs [1]. Understanding of the physical mechanism allows the realization of same and better performance improvement as in [1] with only 2, optimally positioned filters.
© 2006 Optical Society of America
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