LCT for the European data relay system: in orbit commissioning of the Alphasat and Sentinel 1A LCTs

Heine, F.; Mühlnikel, Gerd; Zech, Herwig; Tröndle, Daniel; Seel, S.; Motzigemba, Matthias; Meyer, Rolf; Philipp-May, Sabine; Benzi, Edoardo

doi:10.1117/12.2083117

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…1) and on Sentinel-1a and -2a since 2014 and 2015, respectively. GEO-LEO optical coherent communication has been verified in 2014 [4] and GEO-toground communication is currently being verified [5].…”

Section: Introductionmentioning

confidence: 99%

Satellite Quantum Communication via the Alphasat Laser Communication Terminal - Quantum Signals from 36 thousand kilometers above Earth

Elser¹,

Günthner²,

Khan³

et al. 2015

2015 IEEE International Conference on Space Optical Systems and Applications (ICSOS)

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By harnessing quantum effects, we nowadays can use encryption that is in principle proven to withstand any conceivable attack. These fascinating quantum features have been implemented in metropolitan quantum networks around the world. In order to interconnect such networks over long distances, optical satellite communication is the method of choice. quadratures (continuous variables). This opens the possibility to adapt our Laser Communication Terminals (LCTs) to quantum key distribution (QKD). First satellite measurement campaigns are currently validating our approach. Standard telecommunication components allow one to efficiently implement quantum communication by measuring field

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Section: Introductionmentioning

confidence: 99%

Satellite Quantum Communication via the Alphasat Laser Communication Terminal - Quantum Signals from 36 thousand kilometers above Earth

Elser¹,

Günthner²,

Khan³

et al. 2015

2015 IEEE International Conference on Space Optical Systems and Applications (ICSOS)

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“…However, a very common use case of optical satellite links is classical communication via binary phase-shift keying. Since only the sign of the homodyne signal is relevant in this case, the measurement data in the detectors get deliberately projected into binary outcomes by signal processing [30,31]. The question then arises whether these detectors despite the strong technical constraint could be repurposed to detect, e.g., squeezed light.…”

Section: Introductionmentioning

confidence: 99%

Binary homodyne detection for observing quadrature squeezing in satellite links

Müller

Seshadreesan

Peuntinger

et al. 2020

Phys. Rev. Research

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Optical satellite links open up new prospects for realizing quantum physical experiments over unprecedented length scales. We analyze and affirm the feasibility of detecting quantum squeezing in an optical mode with homodyne detection of only one bit resolution, as is found in satellites already in orbit. We show experimentally that, in combination with a coherent displacement, a binary homodyne detector can still detect quantum squeezing efficiently even under high loss. The sample overhead in comparison to nondiscretized homodyne detection is merely a factor of 3.3.

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“…For the satellite optical communication system, the beaconless spatial acquisition is required between the laser communication terminals. Compared with the typical acquisition process, beaconless algorithm investigates the elimination of beacon laser, instead of using the narrow divergence communication beam for acquisition [1]- [3], the spiral scanning mode of laser beam is used in the uncertain areas. In the acquisition process of laser link, the vibration and attitude change of the satellite platform will affect the laser beam acquisition probability.…”

Section: Introductionmentioning

confidence: 99%

The Optimization Design of Sub-Regions Scanning and Vibration Analysis for Beaconless Spatial Acquisition in the Inter-Satellite Laser Communication System

2018

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We mainly report an efficient approach to optimize the design of beaconless spatial laser acquisition. In order to analyze the influence of vibration environment on the beaconless spatial acquisition, a demonstration of an efficient method will be presented to simulate the level of satellite platform vibration. An important power spectral density (PSD) model of satellite platform vibration used by the European Space Agency is introduced. Then through LABVIEW, a simulated vibration waveform is generated, and the simulated PSD has a basic consistency with the in-orbit measurement spectral line, referring to the design of the filter, generating the Gaussian white noise sequence, filtering the pseudorandom signal and the whole processing procedure of parameter matching. The variation interval of the vibration amplitude is from −100 to 40 μrad. Then, the model of beaconless acquisition is proposed, which uses the spiral scan pattern, laser with a divergence angle of 80 μrad scan in an uncertainty cone (UC), and also the scan coupled with the simulated vibration is given. Through the beaconless acquisition program, the vibration is suppressed between −10.7 and 5.9 μrad; when the overlap factor is selected as 10%, it does not produce any leakage scanning area. It can be used for a wide variety of platforms. This new method will be good for analysis and test of beaconless spatial acquisition algorithm. Finally, the description of acquisition duration, which mainly includes the fast steering mirror spiral scan and the mechanical rotary table step scan, is introduced. And the corresponding optimal selection method of sub-region is proposed; the design of 1.6-mrad scanning pattern with 7 × 7 sub-regions in the 8-mrad acquisition UC is given. Through the actual measurement, the acquisition time is 18.21 s, the tracking error is better than 0.4 μrad.

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LCT for the European data relay system: in orbit commissioning of the Alphasat and Sentinel 1A LCTs

Cited by 17 publications

References 5 publications

Satellite Quantum Communication via the Alphasat Laser Communication Terminal - Quantum Signals from 36 thousand kilometers above Earth

Satellite Quantum Communication via the Alphasat Laser Communication Terminal - Quantum Signals from 36 thousand kilometers above Earth

Binary homodyne detection for observing quadrature squeezing in satellite links

The Optimization Design of Sub-Regions Scanning and Vibration Analysis for Beaconless Spatial Acquisition in the Inter-Satellite Laser Communication System

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