mandrel wrapping

Mandrel wrapping: In multimode fiber optics, a technique used to modify the modal distribution of a propagating optical signal. Note: 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, i.e., 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, e.g., 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. Source: from Federal Standard 1037C

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loading characteristic
loading coil
lobe
local access and transport area
local battery
local call
lockout (telecommunication)
log periodic antenna
long haul communications
longitudinal redundancy check
longitudinal voltage

long term stability
loop back
loop gain
low performance equipment
low power communication device
machine readable medium
magneto ionic double refraction
magneto optic effect
main distribution frame
main lobe
main storage

maintainability
maintenance
managed object
manchester code
margin
maritime broadcast communications net
master frequency generator
master station
material scattering
maximal ratio combiner
maximum usable frequency

maximum user signaling rate
mean time between failures
mean time between outages
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mediation function
medium power talker
message
message format
micro mainframe link
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mixer