Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Geiger mode"”.
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Optical communications with a Geiger mode APD array
… the theoretical and practical performance of a Geiger mode avalanche photodiode (GM-APD, or Geiger mode APD) array for use in optical communications systems. I designed and implemented a test pattern generator, capable of producing waveforms with OOK and PPM modulations at a variety of symbol …
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Multi-Domain Coincidence Processing and Memory Architecture for Real-Time Geiger Mode LiDAR
Geiger-Mode LiDAR is a powerful time-of-flight range sensing technology that enables rapid, wide area three-dimensional mapping with the unique capability of foliage penetration. These sensor arrays produce very high data rates on the order of 5 Gbps, requiring high-bandwidth motion compensation …
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A new technique for 3D modeling of water surfaces using a Geiger mode receiver
… (i.e in real time) create a digital surface model of a water surface using bathymetric lidar when presented with water turbidity. Accurate and consistent modeling of the water surface is required in order to correct for the surface’s volatility when imaging the sea floor. However, this …
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Modeling and engineering impact ionization in avalanche photodiodes for near and mid infrared applications
… state-of-the-art APDs, operating in linear and Geiger modes, is to achieve higher operating speeds. For application in which the APD is operated in linear mode the limited speed of APD-based receivers have limited their use in systems that operate at 2.5 and 10 Gbps. However, to meet the demand …
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Data Quality Analysis of the Leica SPL100 Airborne Single Photon Lidar Sensor
Recently, Geiger-mode and single photon lidar sensors have emerged on the commercial market, advertising greater collection efficiency than traditional linear mode lidar systems. Non-linear photon detection is a new technology for the geospatial community, and its performance characteristics for …
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Dynamic pixel selection in free-space photon-counting optical communication systems for the exploitation of excess channel capacity
… signal demodulation and decoding into a multimode problem as wavefronts of the transmitting laser beams are warped spatially past the desired form of a diffraction-limited spot at the receiver end of a free-space optical receiver. Adaptive optics, a traditional solution to this problem, is …
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Nonlinear optics for frequency-doubling in nanosatellite laser communication
… parts. For links at extreme ranges, where linear-mode APDs are insufficient and photon-counting Geiger-mode APDs are required, frequency-doubling can provide up to 10 dB of channel capacity improvement. Additionally, frequency-doubling shows promise as a means to allow CubeSats and …
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Linear Mode CMOS Compatible p-n Junction Avalanche Photodiode for Smart-lighting Applications
… APD devices have been dedicated to the Geiger mode, which aims to count individual photons under ultralow light conditions. This thesis reports on the modeling, design, fabrication,and characterization of CMOS compatible p-n junction Si APDs to be operated in the linear avalanche mode. …
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Silicon Photomultipliers as Free Space Optical Communication Sensors
… sensor. SiPMs are arrays of APDs operated in Geiger mode, characterized by nanosecond output pulses and gains in the order of 106 electrons per photon. This thesis proposes using a SiPM in a 2x2 pixel configuration as a dual pointing and communication sensor for FSOC terminals in LEO. In this …
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Behavioral Modeling of CMOS SPADs Based on TCAD Simulations
… In this region, specifically, when operating in Geiger mode, a single photon is enough to start a chain reaction that manifests as a current pulse. This pulse’s sharp, active edge encodes the time instant when the photon was detected, which supports the use of SPADs to measure Time-Of-Flight and, …
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Designing and implementing a readout strategy for superconducting single photon detectors
… Currently, the leading competition is from the geiger-mode avalanche photodiode, which is capable of ~20- 70% efficiency at a ~5MHz count rate depending on photon energy. In spite of these advantages, the SNSPD is still a brand-new technology and as a result they do not have the same support …
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Study of ultranarrow superconducting NbN nanowires and nanowires under strong magnetic field for photon detection
… Currently, the leading competition is from the geiger-mode avalanche photodiode, which is capable of ~20 ~70% efficiency at a ~5MHz count rate depending on photon energy. In spite of this, the SNSPD is still a brand-new technology with many potential avenues unexplored. Therefore, it is still …