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Proceedings Paper

Ultrafast measurements of 200-GHz GaAs Schottky photodiodes
Author(s): Katheryn Li-Dessau; E. Ozbay; A. S. Hou; J. A. Sheridan; David M. Bloom
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Paper Abstract

Photodetectors play a fundamental role in optical communication and measurement systems. To date, the fastest reported photodiodes have bandwidths around 100 GHz. Because presently available oscilloscopes have bandwidths up to only 50 GHz, electro-optic sampling was used to measure their responses. The speed of the actual devices was indirectly determined by a deconvolution of the system response from the measured data. To overcome this measurement limitation, we have devised two new circuits that allow high-speed photodetectors to be used to measure laser pulses without using expensive sampling oscilloscopes or complex laser systems. The first is a high-speed Schottky photodiode monolithically integrated with an electronic sampler. With this circuit we were able to measure an impulse response of 1.8 ps FWHM corresponding to 3-dB bandwidth of 200 GHz. The second circuit is a high-speed photodiode monolithically integrated with a microwave detector. This second circuit can replace the wavelength-selective nonlinear crystal in autocorrelation and crosscorrelation setups. With this circuit, we were able to measure a 1.4 ps FWHM. The main advantage that the photodetector circuit has over the nonlinear crystal is that it is not wavelength specific.

Paper Details

Date Published: 15 October 1993
PDF: 11 pages
Proc. SPIE 2022, Photodetectors and Power Meters, (15 October 1993); doi: 10.1117/12.158576
Show Author Affiliations
Katheryn Li-Dessau, New Focus, Inc. (United States)
E. Ozbay, Stanford Univ. (United States)
A. S. Hou, Stanford Univ. (United States)
J. A. Sheridan, Stanford Univ. (United States)
David M. Bloom, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 2022:
Photodetectors and Power Meters
Kenneth J. Kaufmann, Editor(s)

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