In situ 100 MeV proton and gamma radiation testing of 25 Gbaud balanced photoreceivers
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43 PARTICLE ACCELERATORS↗
Engineering topics
Datta, Shubhashish
Publications and source records attributed to Datta, Shubhashish.
In-situ gamma radiation testing of 2.4 micron wavelength extended InGaAs photodiodes at dry ice temperatures
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43 PARTICLE ACCELERATORS↗
Programmable pseudo-random sequence generator for use with universal lidar and its associated method of operation
A pseudo-random sequence generator for use within a universal lidar system and its corresponding method of operation. The pseudo-random sequence generator uses synchronized shift registers that are in series Binary adders are provided. The signal output of each of the shift registers is tapped and directed to the binary adders. High-speed switches are provided between the shift registers and the binary adders. The switches are programmed to connect only two of the shift registers to the binary adders for each of the pseudo-random patterns being generated. The binary adders generate an output signal that is received by the first shift register. The signal propagates through all the shift registers to the last shift register. The last shift register outputs a pseudo-random sequence.
Datta, Shubhashish↗
Low-Noise Large-Area Photoreceivers with Low Capacitance Photodiodes
A quad photoreceiver includes a low capacitance quad InGaAs p-i-n photodiode structure formed on an InP (100) substrate. The photodiode includes a substrate providing a buffer layer having a metal contact on its bottom portion serving as a common cathode for receiving a bias voltage, and successive layers deposited on its top portion, the first layer being drift layer, the second being an absorption layer, the third being a cap layer divided into four quarter pie shaped sections spaced apart, with metal contacts being deposited on outermost top portions of each section to provide output terminals, the top portions being active regions for detecting light. Four transimpedance amplifiers have input terminals electrically connected to individual output terminals of each p-i-n photodiode.
Joshi, Abhay M.↗