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?