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This test evaluates the change in optical transmittance of a fiber optic cable after exposure to one or more environmental or physical stress tests. It is not typically performed as a stand-alone test, but performed before, during, and after specified mechanical/environmental tests.
A baseline measurement of optical power is recorded prior to any stress tests. Measurements may be taken at specified intervals throughout the duration of testing. The test setup involves the use of an optical switching system, along with an optical source, a monitor fiber, and a power meter. Optical power will be measured in units of dB and normalized for length.