Optical crosstalk and ancillary measurements of free space coupled: InGaAs quad photoreceivers exposed to protons and alpha particles

Shubhashish Datta; Abhay M. Joshi; Nilesh Soni; Jeff Mertz; Michael Sivertz; Trevor Olsen

doi:10.1117/12.2663407

15 June 2023 Optical crosstalk and ancillary measurements of free space coupled: InGaAs quad photoreceivers exposed to protons and alpha particles

Shubhashish Datta, Abhay M. Joshi, Nilesh Soni, Jeff Mertz, Michael Sivertz, Trevor Olsen

Author Affiliations +

Proceedings Volume 12514, Image Sensing Technologies: Materials, Devices, Systems, and Applications X; 1251406 (2023) https://doi.org/10.1117/12.2663407
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

Free space coupled, InGaAs PIN + TIA Quad Photoreceivers enable multiple space applications that require differential wavefront sensing, such as gravitational wave detectors, and position sensing and tracking, for example inter-satellite optical communication links. Optical crosstalk between the individual quadrants of the 2 × 2 photoreceiver array is a key parameter that limits the position and/or direction sensing error of the system. Therefore, it is imperative to ensure low crosstalk in the quad photoreceivers throughout the mission life. We present 1 mm, 1.5 mm, and 2 mm diameter low noise Quad Photoreceivers that demonstrate crosstalk < -30 dB up to 20 MHz frequency. These devices were subjected to 100 MeV Protons and 100 MeV/n Helium Ions up to a fluence of 1 × 1010 cm^-2. These tests not only validate the devices for Geostationary Orbit missions, but also for deep space missions outside of Earth’s protective magnetosphere where Galactic Cosmic Rays are a significant component of the radiation environment. All devices were found to be fully functional after radiation, and their crosstalk was essentially unchanged in all cases. Pre- and Post- radiation results were also measured for Dark Current vs. Reverse Bias Voltage for the Quad Photodiodes, DC Responsivity of the Quad Photodiodes, Conversion Gain and Bandwidth of the PIN + TIA Quad Photoreceiver, TIA Drive Current, and Input Equivalent Noise Density of PIN + TIA. Although we observed an increase in dark current due to radiation induced displacement damage in the Quad Photodiode, we did not observe any change in any other parameter for Quad Photoreceivers.

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Citation Download Citation

Shubhashish Datta, Abhay M. Joshi, Nilesh Soni, Jeff Mertz, Michael Sivertz, and Trevor Olsen "Optical crosstalk and ancillary measurements of free space coupled: InGaAs quad photoreceivers exposed to protons and alpha particles", Proc. SPIE 12514, Image Sensing Technologies: Materials, Devices, Systems, and Applications X, 1251406 (15 June 2023); https://doi.org/10.1117/12.2663407

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