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A new concept for spatially resolved coherent detection with vertically illuminated photodetectors targeting ranging applications

: Rustige, P.; Runge, P.; Soares, F.M.; Krause, J.; Schell, M.


Jiang, S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical Components and Materials XVIII : 6-11 March 2021, Online Only, United States
Bellingham, WA: SPIE, 2021 (Proceedings of SPIE 11682)
ISBN: 978-1-5106-4199-0
ISBN: 978-1-5106-4200-3
Paper 1168206, 7 S.
Conference "Optical Components and Materials" <18, 2021, Online>
Fraunhofer HHI ()

A novel approach for coherent detection with double-side vertically illuminated photodetectors is presented. Signal and local oscillator (LO) are injected collinearly from opposite sides of the photodetector chip. As a result, no optical combiners are required and the concept inherently provides angular selective detection, as the relative angle between signal and LO has a strong influence on the generated RF power. These properties can be exploited for developing compact, solid-state receiver modules in single-channel and arrayed configurations for different sensing and imaging applications, e.g., coherent light detection and ranging (LiDAR).