Journal
OPTICS EXPRESS
Volume 30, Issue 22, Pages 40188-40195Publisher
Optica Publishing Group
DOI: 10.1364/OE.470615
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Funding
- Horizon 2020 Framework Programme [828893]
- Austrian Science Fund [M2485-N34]
- Air Force Office of Scientific Research [FA8655-22-1-7170]
- osterreichische Forschungsforderungsgesellschaft [883941]
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Quantum cascade detectors (QCDs) operate at zero external bias with low dark-current, making them suitable for heterodyne detection in long-wave infrared (LWIR) free space optical communication systems. The study compares single and multi-period QCDs to optimize responsivity and noise behavior, revealing significant differences in room-temperature responsivities between the two types of devices.
Quantum cascade detectors (QCDs) are devices operating at zero external bias with a low dark-current. They show linear detection and high saturation intensities, making them suitable candidates for heterodyne detection in long-wave infrared (LWIR) free space optical communication systems. We present an approach to mitigate the performance limitation at long wavelengths, by a comparison of similar single and multi-period QCDs for optimizing their responsivity and noise behaviour. Our InGaAs/InAlAs/InP ridge QCDs are designed for operation at lambda = 9.124 mu m. Optical waveguide simulations support the accurate optical characterization. A detailed device analysis reveals room-temperature responsivities of 111 mA/W for the 15-period and 411 mA/W for the single-period device.
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