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Ultrafast optical thresholding based on two-photon absorption GaAs waveguide photodetectors

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4 Author(s)
Z. Zheng ; Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA ; A. M. Weiner ; J. H. Marsh ; M. M. Karkhanehchi

We report measurements of the pulsewidth dependence of the two-photon absorption photocurrent in GaAs p-i-n waveguide photodetectors using subpicosecond optical pulses at 1.5 μm. For fixed pulse energy, the photocurrent is observed to depend linearly on the inverse of the optical pulsewidth. A subnanosecond electrical response is also observed. Our results show the feasibility of applying such devices for nonlinear processing in ultrafast optical code-division multiple-access and other ultra high-speed optical network applications.

Published in:

IEEE Photonics Technology Letters  (Volume:9 ,  Issue: 4 )