Sarah A. Tedder

Photon Counting Optical Communications Modem Performance

Nicholas C. Lantz, Sarah A. Tedder, John S. Clapham, Nathaniel C. Wilson et autres

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NASA’s laser communications relay demonstration extended experiment program: recent results

Jonathan Woodward, Alan Hylton, Nicholas I. Cummings, Sabino Piazzolla et autres

NASA’s Laser Communications Relay Demonstration Extended Experiment Program: Recent Results

Sabino Piazzolla, Jonathan R. Woodward, Alan Hylton, Nicholas I. Cummings et autres

NASA’s Laser Communications Relay Demonstration Extended Experiment Program: Recent Results

Photonic Lanterns With Increased Mode Capacity Per Output Leg for Use in Superconducting Nanowire Single Photon Detector-Based Ground Receivers

Sarah A. Tedder, Yousef K. Chahine, Brian E. Vyhnalek, Sergio G. Leon-Saval et autres

Photonic lanterns provide an efficient way of coupling light from a single large-core fiber to multiple small core fibers. This capability is of interest for the most demanding space-to-ground optical communication ground receivers. These receivers require high-efficiency coupling from an atmospherically distorted …

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Multi-Gbps fiber-optic wavefront sensing coherent optical receiver

Brian E. Vyhnalek, Yousef K. Chahine, Sarah A. Tedder

We report recent progress on technology developments at the NASA Glenn Research Center using photonic lanterns for coherent optical communications applications. In particular, the development of a spatial mode-diversity optical receiver using a photonic lantern combined with a photonic integrated circuit (PIC). …

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Testing of a photon-counting optical ground receiver with emulated space-to-ground link effects

Michael A. Marsden, Jennifer N. Downey, Sarah A. Tedder, Brian E. Vyhnalek

The National Aeronautics and Space Administration (NASA) Glenn Research Center (GRC) developed and previously characterized a photon-counting optical ground receiver system. The receiver is compliant with the Consultative Committee for Space Data Systems (CCSDS) Optical Communications Coding and Synchronization High Photon Efficiency …

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Performance of a real-time photon counting optical receiver in the presence of emulated channel fading

Jennifer N. Downey, Yousef K. Chahine, Sarah A. Tedder, Evan J. Katz et autres

Free-space optical communication links with terrestrial ground stations experience fading due to atmospheric scintillation and beam pointing. Fiber-coupled receiver systems experience additional fading at the interface between the fiber and free-space optics of the telescope. The National Aeronautics and Space Administration (NASA) …

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Experimental demonstration of coherent receiver with photonic lantern and digital signal processing

Aaron Yevick, Robert Bayne, R. A. García, V.S. Grigoryan et autres

In free-space optical communications in which the signal is coupled into a single-mode fiber, atmospheric distortion leads to loss of signal and reduced receiver sensitivity. We demonstrate a coherent receiver system in which a Dual Polarization Quadrature Phase Shift-Keying (DP-QPSK) signal is …

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The application of photonic lanterns in free space optical communications

Sarah A. Tedder

Photonic lanterns offer an efficient solution to transition distorted light from free space into small aperture or single-mode waveguide devices. As a result, photonic lanterns can be useful for free space optical communications, where light is transmitted across a channel with varying …

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A real-time optical ground receiver for photon starved environments

Jennifer N. Downey, Sarah A. Tedder, Brian E. Vyhnalek, Nicholas C. Lantz et autres

The National Aeronautics and Space Administration (NASA) Glenn Research Center (GRC) has developed a photon-counting optical ground receiver for pulse-position modulated signals. The real-time receiver system includes a fiber interconnect, superconducting nanowire single-photon detectors (SNSPDs), and a real-time field programmable gate array …

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Fiber-detector subsystem loss comparison for a ground-based photon-counting optical receiver

Brian E. Vyhnalek, Sarah A. Tedder

In this paper we present a comparative study of the losses associated with fiber-coupled single-photon detectors in two different configurations, each with the goal of receiving a pulsed-position modulated signal with a maximum data rate of 267 Mbps. First, we consider a …

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Folded optical design for high fidelity atmospheric emulation with a spatial light modulator

Sarah A. Tedder, Yousef K. Chahine

Atmospheric emulators based on spatial light modulators offer the ability to test atmospheric propagation effects on a laser communication component’s performance in the laboratory setting. To create a high-fidelity atmospheric emulator, details of the optical design are key. This paper discusses the …

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