Extinction ratio

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" 2 is the power level generated when the light source is "off."

"Note:" The extinction ratio may be expressed as a fraction or in dB.

Source: from Federal Standard 1037C and from MIL-STD-2196

An example of an extinction ratio measurement taken on a eye diagram can be seen below:


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