Extinction ratio

In telecommunications, extinction ratio (r _e) is the ratio of two optical power levels, of a digital signal generated by an optical source, e.g., a laser diode, where P ₁ is the optical power level generated when the light source is "on," and P ₀ is the power level generated when the light source is "off." The extinction ratio may be expressed as a fraction, in dB, or as a percentage.^[1]

$r_e = \frac{P_1}{P_0}$

References

^ "Extinction Ratio". timbercon. http://www.timbercon.com/Extinction-Ratio.html. Retrieved 2009-05-14.

This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
MIL-STD-2196