Dr. Timothy M. Yarnall Profile

Dr. Timothy M. Yarnall

Assistant Group Leader at MIT Lincoln Lab

SPIE Involvement:

Author

Publications (16)

Proceedings Article | 12 March 2024 Presentation + Paper

Presentation + Paper

Empirical model for lasercom size, weight, and power (SWaP)

Jenny Sun, Sarah Wolpert, Richard Garner, Daniel Marella, Connor Sellar, John Moores, Todd Ulmer, Timothy Yarnall

Proceedings Volume 12877, 1287715 (2024) https://doi.org/10.1117/12.2691617

KEYWORDS: Forward error correction, Data modeling, Design, Quantum receivers, Laser development, Acquisition tracking and pointing, Field programmable gate arrays, Transmitters, Laser communication terminals, Laser communications, Free space optical communications, Optical communications, Satellite communications

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Recovery of single-polarization waveforms with dual-polarization coherent receivers at low SNRs

Christopher Foy, Jeffrey Minch, Thomas Royster, Derrick Feld, Margaret Boning, Timothy Yarnall

Proceedings Volume 12413, 1241318 (2023) https://doi.org/10.1117/12.2655357

KEYWORDS: Polarization, Digital signal processing, Reconstruction algorithms, Algorithm development, Optical communications

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Proceedings Article | 4 March 2022 Presentation + Paper

Presentation + Paper

Qualifying an integrated coherent receiver for space applications

Christopher Foy, Jeffrey Minch, Derrick Feld, Rebecca Bourque, Daniel Weidman, Michael Kass, Margaret Boning, Timothy Yarnall

Proceedings Volume 11993, 1199306 (2022) https://doi.org/10.1117/12.2612842

KEYWORDS: Free space optics, Telecommunications, Receivers, Satellites, Photonic integrated circuits, Space operations

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The development of space-based, free-space optical (FSO) communication systems is exciting for expanding internet connectivity worldwide. These systems will incorporate dense, low-earth constellations with short intersatellite links. Key to the performance of these satellite constellations are flexible architectures that support higher rates via complex modulation formats, with FSO data links varying between 10-100 Gb/s. However, prior efforts have designed custom modems optimized for each link, severely limiting their flexibility. An alternative is to leverage advances developed by the fiber telecom industry which offer high-rate high-sensitivity digital coherent communication systems while minimizing size, weight, and power (SWAP). These low-SWAP systems rely on commercially available microfabricated integrated coherent receivers (μICRs). Here we present data to help qualify a commercially available μICR for a space application; this data was collected through a series of environmental tests. This work thus expands the reach of coherent systems, allowing for the development of low-SWAP space-based FSO communication systems buttressed with commercially available μICRs. We achieved the space qualification of the μICR by monitoring the component’s bandwidth and electrooptical (EO) transfer function as environmental testing conditions were varied. We selected these environmental conditions to simulate a low-Earth orbit. The environmental testing included: (i) irradiation using a cobalt-60 source up to a total ionizing dose of 100 kilorads, extending qualification to all of the commercial orbits; (ii) thermal cycling with survival temperatures ranging from -40 °C to 70 °C and operational temperatures varying between -5 °C and 65 °C with the part cycled between its survival temperature range twice and its operational range an additional ten times over a 7-day period; (iii) vibration testing to 28 GRMS for 180 seconds on each axis; (iv) shock to a maximum of 1201 g; and (v) thermal vacuum testing at ∼ 6.3 × 10⁻⁶ torr. We observed no degradation in device EO performance after environmental testing.

Proceedings Article | 15 February 2018 Presentation + Paper

Presentation + Paper

Experimental comparison of 3-mode and single-mode coupling over a 1.6-km free-space link

D. Geisler, T. Yarnall, G. Lund, C. Schieler, M. Stevens, N. Fontaine, B. Robinson, S. Hamilton

Proceedings Volume 10524, 105240H (2018) https://doi.org/10.1117/12.2294039

KEYWORDS: Single mode fibers, Staring arrays, Mirrors, Data acquisition, Atmospheric propagation, Atmospheric optics, Free space optics, Optical amplifiers, Receivers, Amplifiers

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Proceedings Article | 15 February 2018 Paper

Paper

Laser communications for human space exploration in cislunar space: ILLUMA-T and O2O

B. Robinson, T. Shih, F. Khatri, D. Boroson, J. Burnside, O. Guldner, S. Constantine, J. Torres, T. Yarnall, C. DeVoe, W. Hubbard, D. Geisler, M. Stevens, O. Mikulina, N. Spellmeyer, J. Wang, R. Butler, M. Hogan, T. King, A. Seas

Proceedings Volume 10524, 105240S (2018) https://doi.org/10.1117/12.2291128

KEYWORDS: Relays, Space operations, Optical communications, Laser communications, Telecommunications, Satellites, Optical amplifiers, Data communications, Modulation, Space telescopes

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Proceedings Article | 22 May 2017 Presentation + Paper

Presentation + Paper

Undersea narrow-beam optical communications field demonstration

Scott Hamilton, Cathy DeVoe, Andrew Fletcher, Igor Gaschits, Farhad Hakimi, Nicholas Hardy, Thomas Howe, Nathan Mittleman, Hemonth Rao, Marvin Scheinbart, Timothy Yarnall

Proceedings Volume 10186, 1018606 (2017) https://doi.org/10.1117/12.2264733

KEYWORDS: Remotely operated vehicles, Free space optical communications, Optical engineering, Laser scattering, Scattering, Signal attenuation, Collimation, Optical communications, Ocean optics, Forward error correction, Laser optics, Atmospheric propagation, Laser development, Receivers, Laser beam propagation, Photon counting, Absorption

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Proceedings Article | 19 April 2017 Presentation

Presentation

Field demonstration of multi-rate narrow-beam undersea optical communication with photon-counting and linear receivers in a turbid harbor (Conference Presentation)

Hemonth Rao, Catherine DeVoe, Andrew Fletcher, Igor Gaschits, Farhad Hakimi, Scott Hamilton, Nicholas Hardy, John Ingwersen, Richard Kaminsky, Marvin Scheinbart, Timothy Yarnall

Proceedings Volume 10096, 1009617 (2017) https://doi.org/10.1117/12.2256597

KEYWORDS: Forward error correction, Optical communications, Receivers, Geometrical optics, Optical testing, Transmitters, Metals, Light wave propagation, Avalanche photodetectors, Atmospheric propagation

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Proceedings Article | 24 February 2017 Presentation + Paper

Presentation + Paper

Experimental demonstration of multi-aperture digital coherent combining over a 3.2-km free-space link

D. Geisler, T. Yarnall, C. Schieler, M. Stevens, B. Robinson, S. Hamilton

Proceedings Volume 10096, 100960C (2017) https://doi.org/10.1117/12.2256581

KEYWORDS: Atmospheric propagation, Receivers, Free space optics, Atmospheric optics, Free space optical communications, Digital signal processing, Free space, Signal to noise ratio, Composites, Telecommunications, Adaptive optics, Signal processing

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SPIE Journal Paper | 9 August 2016 Open Access

Open Access

Demonstration of a variable data-rate free-space optical communication architecture using efficient coherent techniques

David Geisler, Curt Schieler, Timothy Yarnall, Mark Stevens, Bryan Robinson, Scott Hamilton

OE, Vol. 55, Issue 11, 111605, (August 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.11.111605

KEYWORDS: Forward error correction, Signal to noise ratio, Digital signal processing, Receivers, Modulation, Telecommunications, Free space optical communications, Transmitters, Data communications, Binary data

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Proceedings Article | 13 April 2016 Paper

Paper

A burst-mode photon counting receiver with automatic channel estimation and bit rate detection

Hemonth Rao, Catherine DeVoe, Andrew Fletcher, Igor Gaschits, Farhad Hakimi, Scott Hamilton, Nicholas Hardy, John Ingwersen, Richard Kaminsky, John Moores, Marvin Scheinbart, Timothy Yarnall

Proceedings Volume 9739, 97390H (2016) https://doi.org/10.1117/12.2222885

KEYWORDS: Receivers, Forward error correction, Transmitters, Field programmable gate arrays, Clocks, Signal attenuation, Photodetectors, Scattering, Data communications, Signal detection

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Proceedings Article | 15 March 2016 Paper

Paper

Demonstration of lasercom and spatial tracking with a silicon Geiger-mode APD array

Timothy Yarnall, Benjamin Horkley, Ajay Garg, Scott Hamilton

Proceedings Volume 9739, 97390N (2016) https://doi.org/10.1117/12.2219895

KEYWORDS: Sensors, Receivers, Readout integrated circuits, Signal detection, Photodetectors, Silicon, Avalanche photodetectors, Modulation, Photon counting, Forward error correction

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Proceedings Article | 15 March 2016 Paper

Paper

Experimental demonstration of photon efficient coherent temporal combining for data rate scaling

D. Geisler, T. Yarnall, M. Stevens, C. Schieler, B. Robinson, S. Hamilton

Proceedings Volume 9739, 97390Y (2016) https://doi.org/10.1117/12.2218082

KEYWORDS: Receivers, Free space optics, Digital signal processing, Optical communications, Free space optical communications, Transmitters, Signal to noise ratio, Clocks, Modulation, Binary data, Modulators

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Proceedings Article | 28 May 2013 Paper

Paper

A phase-unlocked Hong-Ou-Mandel interferometer

Timothy Yarnall, Ayman Abouraddy, Giovanni Di Guiseppe

Proceedings Volume 8749, 87490G (2013) https://doi.org/10.1117/12.2018094

KEYWORDS: Interferometers, Photons, Interferometry, Phase interferometry, Sensors, Photonics, Beam splitters, Physics, Quantum optics, Quantum information

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Proceedings Article | 24 August 2010 Paper

Paper

Comparisons of Cn2 measurements and power-in-fiber data from two long-path free-space optical communication experiments

Ronald Parenti, Steven Michael, Jeffrey Roth, Timothy Yarnall

Proceedings Volume 7814, 78140Z (2010) https://doi.org/10.1117/12.864256

KEYWORDS: Receivers, Scintillation, Turbulence, Free space optical communications, Transceivers, Information operations, Sensors, Transmitters, Free space optics, Signal detection

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Proceedings Article | 21 August 2009 Paper

Paper

The use of statistical channel models, full-field propagation codes, and field data to predict link availability

Steven Michael, Ronald Parenti, John Moores, William Wilcox, Timothy Yarnall, Alicia Volpicelli, John Taylor

Proceedings Volume 7464, 74640O (2009) https://doi.org/10.1117/12.825490

KEYWORDS: Error analysis, Scintillation, Receivers, Data modeling, Turbulence, Atmospheric propagation, Atmospheric modeling, Transceivers, Statistical modeling, Statistical analysis

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Proceedings Article | 2 May 2009 Paper

Paper

Analysis of rapid Cn2 fluctuations observed during a 5-km communication link experiment

Timothy Yarnall, Steven Michael, John Moores, Ronald Parenti, William Wilcox

Proceedings Volume 7324, 73240B (2009) https://doi.org/10.1117/12.818795

KEYWORDS: Turbulence, Receivers, Telecommunications, Scintillation, Optical communications, Solar radiation, Atmospheric propagation, Clouds, Atmospheric modeling, Atmospheric optics

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Showing 5 of 16 publications

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