sylla_20071009.ppt
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Transcript sylla_20071009.ppt
Broad-Band Optical Clock Recovery
System Using Two-Photon
Absorption in a Silicon Photodiode
Pape Sylla
Clock recovery in fiber optics
Critical to any optical receiver, transceiver, 3R
generator (reamplification, reshaping,
retiming) and optical demultiplexer
Ways to recover clock: Electronically
Limited because of speed
Ways to recover clock: Using nonlinear
effects
To avoid the speed limitation of electronics,
people used nonlinear effects and used PLL
to synchronized the signals.
Problem: Polarization dependent
Other ways to recover clock
People have used injection locking and
resonator filters
Problem: limited data rate
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
Experiment
Experiment II
Results: BER-Eye diagram
Results
Results: Timing Jitter
Questions?