Atmospheric Emulation and Testing Methodology for Laboratory Verification of FSO Communications Transceivers

Geisler, David J.; Hamilton, Scott A.; Wong, Kenaz S.; Schulein, Robert; Wang, J. P.; Bedrosian, P. S.; Schieler, Curt; Spellmeyer, Neal; Caplan, D.O.

doi:10.1109/icsos45490.2019.8978991

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…The Optical Terminal Verification Testbed (OTVT) is a lasercom interoperability testbed for verifying the proper operation of a single Terminal Under Test (TUT) by emulating the remote terminal at the opposite end of a link. Additionally, OTVT emulates channel effects, including far-field irradiance, [19][20] , line-of-sight jitter, PAT propagation time, Doppler shift, and point-ahead, providing a realistic context for evaluation of terminals as they will operate in their deployed environment. OTVT is flexible, adjustable in real-time, and generalized in its implementation while upholding a high standard of accuracy and test repeatability.…”

Section: Interoperability Testingmentioning

confidence: 99%

Implementing and testing generalized pointing, acquisition, and tracking for a space-based adaptive communication node (Space-BACN)

Ulmer,

Reynolds,

Moores

et al. 2024

Free-Space Laser Communications XXXVI

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As lasercom transitions from individual demonstrations to wide-spread deployment, diverging standards and proprietary implementations will impede interoperability between terminals from different suppliers. In this environment, there is an urgent need for a universal lasercom translator terminal capable of supporting multiple acquisition sequences and communication waveforms in order to connect disparate networks. Development of such a generalized terminal is a key goal of the DARPA Space-Based Adaptive Communication Node (Space-BACN) program.Pointing, acquisition, and tracking (PAT) are crucial aspects of interoperability, and multiple styles of PAT sequences have emerged. Even within a given category of beacon generation (e.g., synthesized, in-band, out-of-band), multiple parameters must be specified to define specific entry/exit criteria for each PAT stage, requiring detailed pre-coordination to ensure that terminals from different suppliers can establish a link between them. In addition, extra hardware must be incorporated into the terminal design to accommodate a superset of PAT requirements. Finally, verification testing of multiple PAT sequences in a common testbed drives the testbed implementation requirements.Here, we examine the implications of attempting to accommodate a generalized PAT sequence with a single lasercom terminal. First, we consider the performance of different styles of PAT sequence, and the trades between pointing uncertainty, maximum acquisition range, and allowable scan time. Next, we consider potential hardware requirements for terminals that support multiple PAT sequences. Finally, we consider the testing of such a terminal, and present a testbed architecture intended to accommodate multiple PAT sequences by highly flexible emulation of the remote terminal PAT behavior.

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Section: Interoperability Testingmentioning

confidence: 99%

Implementing and testing generalized pointing, acquisition, and tracking for a space-based adaptive communication node (Space-BACN)

Ulmer,

Reynolds,

Moores

et al. 2024

Free-Space Laser Communications XXXVI

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“…A completely different alternative 36 to turbulence emulation uses a variable optical attenuator to create fade profiles in an optical fiber signal derived from numerical simulations (incorporating both turbulence disturbances and the AO system). This is a cost effective solution to emulate a communication channel under the effect of turbulence, with AO correction or not.…”

Section: Optical Turbulence Emulationmentioning

confidence: 99%

Emulating and characterizing strong turbulence conditions for space-to-ground optical links: the PICOLO bench

Robles,

Petit,

Velluet

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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.We present a method to develop a turbulence emulation bench for low-Earth-orbit satellite-to-ground optical communication links under strong turbulence. We provide guidelines to characterize the spatio–temporal dynamics of phase disturbances and scintillation produced by the emulator on a laser beam. We implemented such an emulator for a link at 10 deg elevation and discuss here its design method and characterization. The characterization results are compared to numerical simulations, and this characterization results in the validation of a digital twin of the emulator. The emulator will serve as a testing platform for adaptive optics systems and other free-space optical communication components under strong turbulence conditions.

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Demonstration of Reliable High-Rate Optical Communication over an Atmospheric Link using ARQ

Schieler

Garg

Bilyeu

et al. 2019

2019 IEEE International Conference on Space Optical Systems and Applications (ICSOS)

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Atmospheric Emulation and Testing Methodology for Laboratory Verification of FSO Communications Transceivers

Cited by 6 publications

References 24 publications

Implementing and testing generalized pointing, acquisition, and tracking for a space-based adaptive communication node (Space-BACN)

Implementing and testing generalized pointing, acquisition, and tracking for a space-based adaptive communication node (Space-BACN)

Emulating and characterizing strong turbulence conditions for space-to-ground optical links: the PICOLO bench

Demonstration of Reliable High-Rate Optical Communication over an Atmospheric Link using ARQ

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