Extinction ratio: Difference between revisions
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where ''P''<sub>1</sub> is the optical power level generated when the light source is on, and ''P''<sub>0</sub> is the power level generated when the light source is off. | where ''P''<sub>1</sub> is the optical power level generated when the light source is on, and ''P''<sub>0</sub> is the power level generated when the light source is off. | ||
The '''polarization extinction ratio''' ('''PER''') is the ratio of optical powers of perpendicular polarizations, usually called TE (transverse electric) and TM (transverse magnetic). In telecommunications, the PER is used to characterize the degree of polarization in a polarization-maintaining device | The '''polarization extinction ratio''' ('''PER''') is the ratio of optical powers of perpendicular polarizations, usually called TE (transverse electric) and TM (transverse magnetic). In telecommunications, the PER is used to characterize the degree of polarization in a polarization-maintaining device [[polarization-maintaining optical fiber]]. For coherent transmitter and receiver, the PER is a key parameter, since X polarization and Y polarization are coded with different signals. | ||
==References== | ==References== | ||
{{Reflist}} | |||
{{ | |||
* {{FS1037C}} | * {{FS1037C}} | ||
* Material also incorporated from MIL-STD-2196. | * Material also incorporated from MIL-STD-2196. | ||
[[Category:Data transmission]] | [[Category:Data transmission]] | ||
[[Category:Engineering ratios]] | [[Category:Engineering ratios]] | ||
[[Category:Laser science]] | [[Category:Laser science]] | ||
[[Category:Telecommunication theory]] | |||
{{electronics-stub}} | {{electronics-stub}} | ||
Latest revision as of 23:21, 28 August 2025
In telecommunications, extinction ratio (re) is the ratio of two optical power levels of a digital signal generated by an optical source, e.g., a laser diode. The extinction ratio may be expressed as a fraction, in dB, or as a percentage.[1] It may be given by
where P1 is the optical power level generated when the light source is on, and P0 is the power level generated when the light source is off.
The polarization extinction ratio (PER) is the ratio of optical powers of perpendicular polarizations, usually called TE (transverse electric) and TM (transverse magnetic). In telecommunications, the PER is used to characterize the degree of polarization in a polarization-maintaining device polarization-maintaining optical fiber. For coherent transmitter and receiver, the PER is a key parameter, since X polarization and Y polarization are coded with different signals.
References
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- Material also incorporated from MIL-STD-2196.
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