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?