Bel (B)
The logarithm to the base 10 of a power ratio, expressed as: B = log10(P1/P2), where P1 and P2 are distinct powers. The decibel, equal to one-tenth bel, is a more commonly used unit.
Fiber-Optics.infoThe logarithm to the base 10 of a power ratio, expressed as: B = log10(P1/P2), where P1 and P2 are distinct powers. The decibel, equal to one-tenth bel, is a more commonly used unit.