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

Zheng, Z., Weiner, A.M., Marsh, J.H. and Karkhanehchi, M.M. (1997) Ultrafast optical thresholding based on two-photon absorption GaAs waveguide photodetectors. IEEE Photonics Technology Letters, 9(4), pp. 493-495. (doi: 10.1109/68.559399)

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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.

Item Type:Articles
Additional Information:The work of Z. Zheng and A. M. Weiner was supported by the AFOSR under Contract F49620-95-1-0533.
Glasgow Author(s) Enlighten ID:Marsh, Professor John
Authors: Zheng, Z., Weiner, A.M., Marsh, J.H., and Karkhanehchi, M.M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Photonics Technology Letters
ISSN (Online):1941-0174

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