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Telecommunications Industry Association , 10/01/1990
Publisher: TIA
File Format: PDF
$34.00$69.00
This test method describes a procedure for measuring the spectral attentuation of long-length (greater than or equal to 1 km), graded-index multimode optical fibers. Definition of Spectral Attenuation The attenuation A(lambda) expressed in dB at wavelength lambda between two cross sections 1 and 2 separated by distance L of fiber is defined as: A(lambda) = -10 log P2/P1 where: P1 is the optical power traversing the cross section 1. P2 is power traversing cross section 2. For a uniform fiber under equilibrium conditions, it is possible to define an attenuation per unit length, or an attenuation coefficient alpha(lambda) = A(lambda)/L which is independent of the chosen length of the fiber.
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