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Proceedings Paper

Large-area transmission modulators for 3D time-of-flight imaging
Author(s): Markus Miller; Hongwang Xia; Mina Beshara; Susanne Menzel; Karl Joachim Ebeling; Rainer Michalzik
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Paper Abstract

The indirect time-of-flight principle is one possibility to build a three-dimensional (3D) camera system. Available products based on this principle mostly use special CMOS sensors for demodulation of the optical signal at the receiver. This special CMOS chip can be replaced by a standard image sensor in combination with a quantum well electroabsorption modulator. In this case, the modulator heavily influences the 3D camera performance. Especially the characteristics of large-area devices are of major interest. Transmission electroaborption modulators with sizes in the square millimeter range have been fabricated for operating wavelengths of 850 and 940 nm. While the 850nm devices were realized as non-resonant structures, for 940nm devices a resonant design was developed to overcome the limitation in the number of quantum wells. Investigations of the static and dynamic behavior show extinction ratios up to 2.5 dB and corner frequencies up to 30 MHz. A single-point distance measurement setup demonstrates the high potential of the devices for the 3D application.

Paper Details

Date Published: 30 March 2020
PDF: 10 pages
Proc. SPIE 11351, Unconventional Optical Imaging II, 113511F (30 March 2020); doi: 10.1117/12.2553473
Show Author Affiliations
Markus Miller, Univ. Ulm (Germany)
Hongwang Xia, Univ. Ulm (Germany)
Mina Beshara, Univ. Ulm (Germany)
Susanne Menzel, Univ. Ulm (Germany)
Karl Joachim Ebeling, Univ. Ulm (Germany)
Rainer Michalzik, Univ. Ulm (Germany)

Published in SPIE Proceedings Vol. 11351:
Unconventional Optical Imaging II
Corinne Fournier; Marc P. Georges; Gabriel Popescu, Editor(s)

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