Published/Posted: February 15, 2010
Authors: Apiratikul, P.; Murphy, T. E.
We describe an ultrafast optical sampling system that uses nondegenerate two-photon absorption (2PA) in a GaAs photodiode. By choosing the sampling pulses to have a photon energy below the half-bandgap, we successfully suppress the otherwise large photocurrent associated with 2PA of the strong sampling pulses. Using this approach, we demonstrate a background-suppressed measurement of quasi-4-Tb/s eye diagrams, with temporal resolution that is limited by the sampling pulsewidth.
P. Apiratikul and T. E. Murphy, "Background-Suppressed Ultrafast Optical Sampling Using Nondegenerate Two-Photon Absorption in a GaAs Photodiode", IEEE Photon. Technol. Lett. 22(4) 212-214 (2010)
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