Photoconductive optical correlator

Details Photoconductive optical correlator Photoconductive optical correlator

1996-05-29

1999-05-04

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214VT, H01J 4014

Patent

active

059006242

ABSTRACT:
An optical correlator for correlating incident optical signals is described. The correlator comprises a transmission line in close juxtaposition to a photoconductor. The photoconductor may be positioned within the transmission line. The transmission line and the photoconductor may be monolithically integrated on a substrate. The optical correlator has an electrical non-linear response to the incident optical signals that results from a voltage divider formed from the combination of the transmission line and the photoconductor. The electrical non-linear response is proportional to a second-order intensity autocorrelation function g.sup.(2) (.tau.). The response time of the electrical nonlinear response is less than the width of the narrowest pulse of the optical signals and may be less than twenty picoseconds.

REFERENCES:
patent: 4866660 (1989-09-01), Merkelo et al.
patent: 4870295 (1989-09-01), Rauscher
F.W. Smith et al., "Picosecond GaAs-based photoconductive optoelectronic detectors", Applied Physics Letters 54 (10): 890-892 (1989), Jan. 1989.
K. Grigoras et al., "Picosecond Lifetime Measurement in Semiconductor by Optoelectronic Autocorrelation", Electronics Letters 27(12): 1024-1025 (1991), Jun. 1991.
S. Verghese et al., "Correlation of Optical Pulses with A Low-Temperature-Grown GaAs Photoconductor" Proceedings of 1995 International Semiconductor Device Research Symposium, Charlottesville, Dec. 5-8, 1995, p. 433.

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