1. Broad-Band Optical Clock Recovery System Using Two-Photon Absorption in a Silicon Photodiode Pape Sylla

2. Clock recovery in fiber optics Critical to any optical receiver, transceiver, 3R generator (reamplification, reshaping, retiming) and optical demultiplexer

3. Ways to recover clock: Electronically Limited because of speed

4. 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

5. Other ways to recover clock People have used injection locking and resonator filters Problem: limited data rate

6. 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

7. Experiment

8. Experiment II

9. Results: BER-Eye diagram

10. Results

11. Results: Timing Jitter

12. Questions?