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Subject : 
light through the fiber
 
Description : 
Why I cannot see the light through the fiber?

 
Solution : 
Single mode LC fiber will have a wavelength around 1400nm (Infrared) whereas a typical human eye will respond to wavelengths from about 390 to 700 nm. In other words the light coming from the fiber will be invisible for human eye. To test a fiber you will need a specific tool call VFL (Visual Fault Locator).
 
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