High sensitivity autocorrelation using two-photon absorption in InGaAsP waveguides

Author

Tsang, H.K. ; Chan, L.Y. ; Soole, J.B.D. ; Leblanc, H.P. ; Koza, M.A. ; Bhat, R.

Author_Institution

Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong

Volume

31

Issue

20

fYear

1995

fDate

9/28/1995 12:00:00 AM

Firstpage

1773

Lastpage

1775

Abstract

We have used TPA in an InGaAsP waveguide for a high sensitivity autocorrelator suitable for measuring the pulse width of low power 1.55 μm wavelength optical pulses. The autocorrelation pulse widths are consistent with those expected from numerical autocorrelation of the actual pulse temporal profile. And the magnitude of the photocurrent is in good agreement with that expected from TPA. The sensitivity achieved by the autocorrelator of 0.08 (mW)² is the best reported to our knowledge. The use of TPA in a semiconductor waveguide was found to be a practical and easily implementable alternative to the use of SHG for autocorrelation measurements

Keywords

III-V semiconductors; gallium arsenide; high-speed optical techniques; indium compounds; optical correlation; optical variables measurement; optical waveguides; two-photon processes; 1.55 micron; InGaAsP; autocorrelation; low power optical pulses; photocurrent; pulse width measurement; semiconductor waveguide; two-photon absorption;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19951185

Filename

469246