Ultrafast measurements of 200-GHz GaAs Schottky photodiodes

Katheryn Li-Dessau; E. Ozbay; A. S. Hou; J. A. Sheridan; David M. Bloom

doi:10.1117/12.158576

15 October 1993 Ultrafast measurements of 200-GHz GaAs Schottky photodiodes

Katheryn Li-Dessau, E. Ozbay, A. S. Hou, J. A. Sheridan, David M. Bloom

Proceedings Volume 2022, Photodetectors and Power Meters; (1993) https://doi.org/10.1117/12.158576
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

Citation Download Citation

Katheryn Li-Dessau, E. Ozbay, A. S. Hou, J. A. Sheridan, and David M. Bloom "Ultrafast measurements of 200-GHz GaAs Schottky photodiodes", Proc. SPIE 2022, Photodetectors and Power Meters, (15 October 1993); https://doi.org/10.1117/12.158576

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