Mandrel wrapping
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In multimode fiber optics, mandrel wrapping is a technique used to modify the modal distribution of a propagating optical signal.
A cylindrical rod wrap consists of a specified number turns of fiber on a mandrel of specified size, depending on the fiber characteristics and the desired modal distribution. It has application in optical transmission performance tests, to simulate (or establish) equilibrium mode distribution in a launch fiber (a fiber used to inject a test signal in another fiber that is under test). If the launch fiber is fully filled ahead of the mandrel wrap, the higher-order modes will be stripped off, leaving only lower-order modes. If the launch fiber is underfilled, for example as a consequence of being energized by a laser diode or edge-emitting LED, there will be a redistribution to higher-order modes until modal equilibrium is reached.
[edit] See also
This article contains material from the Federal Standard 1037C, which, as a work of the United States Government, is in the public domain.
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