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Reported here are optical fibers exhibiting significant longitudinal changes in optical properties over short lengths. The Brillouin gain is found to decrease by over 6 dB relative to a standard optical fiber as a result
In the paper, the proportions of the sea clutter Intrinsic Mode Functions (ab. IMFs) energy to the whole signal energy and the influence of the target on the proportions are discussed. It is found that the latter low frequency IMFs are weaker when no target is hit, but they are stronger when the target is hit, and the proportions of their energy to the whole signal energy become larger, which could...
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