Optical technologies for terabit/s-throughput feeder link

Saathof, Rudolf; Breeje, Remco den; Klop, W.; Kuiper, Stefan; Doelman, Niek; Pettazzi, Federico; Vosteen, Amir; Truyens, Niel; Crowcombe, Will; Human, Jet; Ferrario, Ivan; Calvo, Ramon Mata; Poliak, Juraj; Barrios, Ricardo; Giggenbach, Dirk; Fuchs, Christian; Scalise, Sandro

doi:10.1109/icsos.2017.8357221

Cited by 28 publications

(18 citation statements)

References 29 publications

(26 reference statements)

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“…Despite all these technical challenges, the FSO feeder-link remains the most promising tech-nological option for next generation VHTS systems [7], [14]. For instance, in the frame of the Terabit-throughput optical satellite system technology (THRUST) project, the German Aerospace Agency DLR set the world-record in FSO communications to 1.72 Tbit/s and 13.16 Tbit/s in 2016 and 2017, respectively [35], [36].…”

Section: Introductionmentioning

confidence: 99%

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

Zedini¹,

Kammoun²,

Alouini³

2020

Preprint

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Due to recent advances in laser satellite communications technology, free-space optical (FSO) links are presented as an ideal alternative to the conventional radio frequency (RF) feeder links of the geostationary satellite for next generation very high throughput satellite (VHTS) systems. In this paper, we investigate the performance of multibeam VHTS systems that account for nonlinear high power amplifiers at the transparent fixed gain satellite transponder. Specifically, we consider the forward link of such systems, where the RF user link is assumed to follow the shadowed Rician model and the FSO feeder link is modeled by the Gamma-Gamma distribution in the presence of beam wander and pointing errors where it operates under either the intensity modulation with direct detection or the heterodyne detection. Moreover, zero-forcing precoder is employed to mitigate the effect of inter-beam interference caused by the aggressive frequency reuse in the user link. The performance of the system under study is evaluated in terms of the outage probability, the average bit-error rate (BER), and the ergodic capacity that are derived in exact closed-forms in terms of the bivariate Meijer's G function. Simple asymptotic results for the outage probability and the average BER are also obtained at high signal-to-noise ratio.

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Section: Introductionmentioning

confidence: 99%

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

Zedini¹,

Kammoun²,

Alouini³

2020

Preprint

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“…The use of adaptive optics in optical ground stations for high-rate optical links from space to ground is state of the art 1,2 . The adaptive pre-compensation of the transmitted wave-front is considered an enabling technology for high-rate optical data transmission from ground to space, and subject to extensive researchboth analytically, and experimentally 3,4,5,6,7 .…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction and experimental validation of irradiance fluctuations in a pre-compensated optical feeder link

Kudielka¹,

Fischer²,

Dreischer³

2019

International Conference on Space Optics — ICSO 2018

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This paper focuses on optical links from ground to a geostationary satellite, using adaptive optics to pre-compensate the wave-front of the uplink beam. We present the numerical prediction of the irradiance statistics at the satellite. Uplink beam diameters, as well as the turbulence strength in the boundary layer and in the tropopause are varied. Results show, that the choice of uplink beam diameter significantly affects the fading statistics, in particular the shape of the probability density function. In a realistic worst case (30° elevation, day-time turbulence, sea level), the optimum beam diameter, showing minimum irradiance fluctuation at the target, is around 20 cm. In that case, the probability of fades larger than 6 dB (with respect to the diffraction limit) is approx. 10 -3 .A breadboard of such a closed-loop adaptive-optics pre-compensation system has been implemented. It comprises a Shack-Hartmann wavefront sensor, two tip/tilt mirrors, a 140-element deformable mirror, a far-field propagation simulator, and two rotating turbulence phase screens (simulating tropopause and atmospheric boundary layer, respectively). The link geometry is representative of the intended application in an optical feeder link for geo-stationary satellites. Preliminary test results confirm the numerical predictions.

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“…Free space optical (FSO) communications is a well-positioned technology to increase the data-rate of high throughput feeder links for telecommunication satellites beyond the limits of radio frequencies (RF) [1]. At TNO, an optical ground terminal (OGT) is being designed for terabit/s optical feeder links, with a physical layer for the communications system, which is developed by DLR [2].…”

Section: Introductionmentioning

confidence: 99%

“…Adaptive Optics (AO) is a well-known technique originating from astronomy, which can effectively compensate atmospheric turbulence over a downlink [3,4]. Pre-correction AO has been proposed in various publications to mitigate the atmospheric turbulence in the uplink [2,5,6,7,8,9]. Pre-correction AO is based upon the reciprocity principle, which is only partially fulfilled for optical feeder links.…”

Section: Introductionmentioning

confidence: 99%

Pre-correction adaptive optics performance for a 10 km laser link

Saathof

Breeje

Klop

et al. 2019

Free-Space Laser Communications XXXI

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For the next generation of very high throughput communication satellites, free-space optical (FSO) communication between ground stations and geostationary telecommunication satellites is likely to replace conventional RF links. To mitigate atmospheric turbulence, TNO and DLR propose Adaptive Optics (AO) to apply uplink pre-correction. In order to demonstrate the feasibility of AO pre-correction an FSO link has been tested over a 10 km range. This paper shows that AO pre-correction is most advantageous for low point ahead angles (PAAs), as expected. In addition, an optimum AO precorrection performance is found at 16 AO modes for the experimental conditions. For the specific test site, tip-tilt precorrection accounted for 4.5 dB improvement in the link budget. Higher order AO modes accounted for another 1.5 dB improvement in the link budget. From these results it is concluded that AO pre-correction can effectively improve highthroughput optical feeder links.

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Optical technologies for terabit/s-throughput feeder link

Cited by 28 publications

References 29 publications

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

Numerical prediction and experimental validation of irradiance fluctuations in a pre-compensated optical feeder link

Pre-correction adaptive optics performance for a 10 km laser link

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