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Attenuation is a decrease of light intensity within a fiber, usually due to absorption and scattering losses. This loss of power is measured in decibels (dB) where
dB = 10*log (Pin/Pout)
where:
Pin, Pout are the input and output powers.
The affects of these losses increase with fiber length. The value dB/m measures power lost in dB for every meter of fiber. Edmund Optics' attenuation curves measure the power loss in dB/m for our Communications Grade Optical Fibers and dB/km for our Optical Grade Fibers across the visible spectrum. For example, our 1000 micron diameter Communications Grade Optical Fiber has an attenuation of approximately 0.1dB/m at 600nm. If you were to use a 2-meter fiber, then the total loss would be 0.2 decibels. If we had an input power of 100mW, the output power would then be 95.5mW, resulting in a 5.5% loss. Resultant output power of a fiber, given its attenuation, can be calculated using the equation below:
Pout = Pin * 10-dB/10
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