Title :
High-sensitivity two-photon absorption microcavity autocorrelator
Author :
Krug, T. ; Lynch, M. ; Bradley, A.L. ; Donegan, J.F. ; Barry, L.P. ; Folliot, H. ; Roberts, J.S. ; Hill, G.
Author_Institution :
Semicond. Photonics Group, Univ. of Dublin, Ireland
fDate :
6/1/2004 12:00:00 AM
Abstract :
A GaAs-AlAs microcavity device has been used as a photodetector in an autocorrelator for measuring the temporal pulsewidth of 1.5-μm optical pulses. Enhancement of the two-photon absorption photocurrent due to the microcavity structure results in an autocorrelation (average power times peak power) sensitivity of 9.3×10/sup -4/ (mW)2, which represents two orders of magnitude improvement when compared with conventional autocorrelators.
Keywords :
III-V semiconductors; aluminium compounds; gallium arsenide; high-speed optical techniques; micro-optics; microcavities; optical communication equipment; optical correlation; photodetectors; two-photon processes; 1.5 mum; GaAs-AlAs; microcavity autocorrelator; photodetector; temporal pulsewidth measurement; two-photon absorption; Absorption; Autocorrelation; Distributed Bragg reflectors; Microcavities; Mirrors; Optical pulses; Optical waveguides; Photoconductivity; Pulse measurements; Space vector pulse width modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.827102
