Mr. Ondrej Cierny Profile

Ondrej Cierny

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Publications (8)

Proceedings Article | 12 July 2023 Open Access

Transmitter and fine pointing system development and testing for the CubeSat Laser Infrared CrosslinK (CLICK) B/C mission

Hannah Tomio, William Kammerer, Peter Grenfell, Ondrej Cierny, Madeline Garcia, Charles Lindsay, Nicholas Belsten, Paul Serra, Kerri Cahoy, Myles Clark, Danielle Coogan, John Conklin, David Mayer, Jan Stupl, John Hanson

Proceedings Volume 12777, 1277731 (2023) https://doi.org/10.1117/12.2690323

KEYWORDS: Transmitters, Acquisition tracking and pointing, Modulation, Infrared radiation, Infrared lasers, Astronomical imaging, Space operations, Laser soldering, Digital signal processing, Beam steering

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Proceedings Article | 12 July 2023 Open Access

CLICK mission flight terminal optomechanical integration and testing

William Kammerer, Peter Grenfell, Laura Hyest, Paul Serra, Hannah Tomio, Nick Belsten, Charles Lindsay, Ondrej Cierny, Kerri Cahoy, Myles Clark, Dani Coogan, John Conklin, David Mayer, Jan Stupl, John Hanson

Proceedings Volume 12777, 1277730 (2023) https://doi.org/10.1117/12.2690321

KEYWORDS: Optical benches, Space operations, Sensors, Telescopes, Beam divergence, Avalanche photodetectors, Collimators, Cameras, Optical mounts, Optical alignment

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Proceedings Article | 15 March 2023 Presentation + Paper

Evaluating the performance of a sensorless wavefront correction algorithm for turbulent horizontal point-to-point links

Ondrej Čierny, Bruce Moision, Kerri Cahoy

Proceedings Volume 12413, 1241312 (2023) https://doi.org/10.1117/12.2651076

KEYWORDS: Adaptive optics, Scintillation, Actuators, Wavefronts, Receivers, Computer simulations, Spatial light modulators, Calibration, Wavefront sensors, Single mode fibers

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Proceedings Article | 11 June 2021 Open Access

Optical front-end for a quantum key distribution cubesat

Paul Serra, Ondrej Čierny, William Kammerer, Ewan Douglas, Dae Wook Kim, Jaren N. Ashcraft, George Smith, Charlotte Guthery, Tom Vergoossen, Alexander Lohrmann, Robert Bedington, Chithrabhanu Perumangatt, Alexander Ling, Kerri Cahoy

Proceedings Volume 11852, 118523C (2021) https://doi.org/10.1117/12.2599542

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Proceedings Article | 11 June 2021 Open Access

CubeSat laser infrared crosslinK mission status

Paul Serra, Hannah Tomio, Ondrej Cierny, William Kammerer, Peter Grenfell, Grant Gunnison, Joseph Kusters, Cadence Payne, Paula do Vale Pereira, David Mayer, Jan Stupl, John Hanson, Simon Barke, Myles Clark, Tyler Ritz, Danielle Coogan, John Conklin, Kerri Cahoy

Proceedings Volume 11852, 118523D (2021) https://doi.org/10.1117/12.2599543

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Proceedings Article | 5 March 2021 Presentation + Paper

Beaconless pointing and tracking for bidirectional optical links using MEMS mirror nutation

Ondrej Čierny, Paul Serra, Kerri Cahoy

Proceedings Volume 11678, 116780I (2021) https://doi.org/10.1117/12.2582615

KEYWORDS: Signal to noise ratio, Mirrors, Microelectromechanical systems, Optical tracking, Free space optics, Signal detection, Receivers, Error analysis, Optoelectronics, Transceivers

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Proceedings Article | 5 March 2021 Presentation + Paper

Link analysis for a liquid lens beam steering system, the miniature optical steered antenna for intersatellite communication: MOSAIC

Shreeyam Kacker, Ondrej Cierny, Jared Boyer, Kerri Cahoy

Proceedings Volume 11678, 116780T (2021) https://doi.org/10.1117/12.2582607

KEYWORDS: Telecommunications, Liquid lenses, Beam steering, Optical communications, Liquids, Antennas, Radio optics, Mirrors, Zemax, Transmitters

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Laser communications can enable more efficient and higher bandwidth communications across longer distances than conventional radio frequency (RF) systems. However, beam divergence angles for laser systems are narrower than typical RF systems, and require precise pointing, acquisition, and tracking systems to establish and maintain the link. In addition, typical lasercom links are point-to-point, and not capable of multicast or broadcast. Conventional pointing and tracking (PAT) systems use mechanical gimbals or fast-steering mirrors. Mechanical gimbals may not meet the size, weight, and power (SWaP) constraints for small spacecraft, particularly for multiple concurrent spatially diverse beams. Fast-steering mirrors while compact and efficient have limited aperture size, and many would be needed to provide multiple links over a hemisphere. The Miniature Optical Steered Antenna for Intersatellite Communications (MOSAIC) aims to provide nonmechanical pointing and tracking using liquid lenses, allowing a wide field-of-view and support for multiple concurrent links. Initial work with commercially available liquid lenses showed that liquid lenses can be used in a space environment and assessed spatial coverage. In this work, we model a transmitter using three liquid lenses. One on-axis lens provides focusing capability. Two off-axis and perpendicular lenses provide beam steering, with a fisheye lens amplifying the effect. This provides near-hemispherical pointing up to 170 degrees. We investigate beam quality and divergence using a Zemax model and conduct a link analysis dependent on the beam steering angle and rotation angle. A 25 Mbps link with 200 mW transmit power at 1550 nm (optical C band) and 16-ary pulse position modulation (16-PPM) can be maintained up to 28 km separation with 3 dB margin for an Optotune EL-16-40-TC liquid lens. Losses are primarily due to the liquid lenses limiting aperture size to 16 mm. We also consider the impact of diffusers for increasing numerical aperture through a simple ray transfer analysis and experimental results.

SPIE Journal Paper | 21 November 2018 Open Access

On-orbit beam pointing calibration for nanosatellite laser communications

Ondrej Čierny, Kerri Cahoy

OE, Vol. 58, Issue 04, 041605, (November 2018) https://doi.org/10.1117/12.10.1117/1.OE.58.4.041605

KEYWORDS: Calibration, Staring arrays, Error analysis, Sensors, Laser communications, Space operations, Beam controllers, Signal detection, Feedback signals, Statistical analysis

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