Elliptical polarization: Difference between revisions

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[[File:On-off keying eye diagram.svg|thumb|300px|right|[[Eye diagram]] showing an example of two power levels in an [[On-off keying|OOK]] modulation scheme which can be used to calculate extinction ratio. ''P<sub>1</sub>'' and ''P<sub>0</sub>'' are represented by ''(binary '1')'' and ''(binary '0')'' respectively.]]
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In [[telecommunication]]s, '''extinction ratio''' (''r''<sub>e</sub>) is the [[ratio]] of two optical [[Power (physics)|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 [[decibel|dB]], or as a [[percentage]].<ref>{{cite web|url=http://www.timbercon.com/Extinction-Ratio.html|title=Extinction Ratio|publisher=Timbercon|accessdate=May 14, 2009}}</ref> It may be given by
 
:<math>r_e = \frac{P_1}{P_0}</math>,
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 is the ratio of optical powers of perpendicular polarization, usually called TE (transverse electrical) and TM (transverse magnetic).
 
==References==
<references/>
*{{FS1037C}}
*Material also incorporated from MIL-STD-2196.
 
[[Category:Data transmission]]
[[Category:Telecommunication theory]]
[[Category:Ratios]]
[[Category:Lasers]]
 
{{electronics-stub}}

Latest revision as of 03:01, 1 October 2014



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Then move on to understanding musician success, recommended you read, it. Your first stage here is to spend the words to memory. Don't make an effort sing together quite yet and to play with guitar! Just examine the lyrics and tune in to how the performer gets particular records, keeps unique notes (as well as for the length of time), and applies over the sensations of the course.

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But I prefer this book because the nursery songs they've picked are most of my favorites. The pictures are eye-catching and vivid if you'd like and you may sing a lot of the selections.

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