Polarization-Insensitive Cross Correlation Using Two-Photon Absorption in a Silicon Photodiode Pape...
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Transcript of Polarization-Insensitive Cross Correlation Using Two-Photon Absorption in a Silicon Photodiode Pape...
![Page 1: Polarization-Insensitive Cross Correlation Using Two-Photon Absorption in a Silicon Photodiode Pape Sylla.](https://reader031.fdocuments.net/reader031/viewer/2022032309/56649d425503460f94a1da7c/html5/thumbnails/1.jpg)
Polarization-Insensitive Cross Correlation Using Two-Photon Absorption in a Silicon Photodiode
Pape Sylla
![Page 2: Polarization-Insensitive Cross Correlation Using Two-Photon Absorption in a Silicon Photodiode Pape Sylla.](https://reader031.fdocuments.net/reader031/viewer/2022032309/56649d425503460f94a1da7c/html5/thumbnails/2.jpg)
Cross-correlation in fiber optics Used for sampling, pattern recognition,
demultiplexing So far, done using a nonlinear effect called
sum-frequency generation which takes place in χ² crystals
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Quick overview of nonlinearity We are use to linear material response of
materials, which manifest itself in the index of refraction.
There are nonlinear material response
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Limitation of the existing method It is polarization dependant, which makes it
unpractical for most application
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Remediation: Two photon absorption They want to use a quantum nonlinear effect
called two photon absorption (TPA) in silicon, which is χ³ susceptible.
It is based of the fact that two photons are simultaneously absorbed by the material to produce current
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Normalized Stokes vectors are located on a unit sphere
11
0
Ss
S 2
20
Ss
S 3
30
Ss
S
Poincare’ sphere:
2 2 21 2 2
0
S S SDOP
S
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Observation: in Silicon, TPA is polarization dependent
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In theory
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Experiment
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