A typical splitter can introduce a signal loss of 3-6 decibels (dB) per split. The signal loss can be a problem if the original signal is already weak or if the splitter is used in a long cable run. 6 dB of loss, a 1×8 introduces ~10. 1. This loss, measured in decibels (dB), is a critical parameter that network designers must account for when planning fiber optic systems. Every time you double the ports, you double the signal paths — and the theoretical loss grows by about 3 dB. Power is divided equally among output ports. The table below illustrates typical.
[pdf] Attenuation refers to the amount of signal loss as it travels down the fiber, typically expressed in dB/km. Losses can be caused by scattering, absorption, dispersion & bending. Optical Time Domain Reflectometers (OTDR) are widely used with telecommunications products and systems for testing bare and cabled fiber, as well as performing final system acceptance testing. This type of testing is the most accurate testing available and is the most accurate characterization of the fiber optic system's apability. This is. Recommendation ITU-T G.
[pdf] 
