RZ-DPSK optical modulation for free space optical communication by satellites

Elayoubi, Karim; Rissons, Angélique; Lacan, Jérôme; Antonin, Laurent Saint; Sotom, M.; Kernec, Arnaud Le

doi:10.1109/oecc.2017.8115015

Cited by 5 publications

(4 citation statements)

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“…Similarly, it may also be noticed from Figure 5(b), (c) that for both higher values of the turbulence, downlink channels that are DPSK modulated perform better than the uplink channels that are OOK modulated. This trend has also been observed in other studies especially under strong turbulence conditions [25,26]. To further elaborate the effect of FSO impairments on the received signals, Figure 6 presents the eye-diagrams of the downlink and uplink channels at different values of turbulence.…”

Section: Resultssupporting

confidence: 79%

“…It has been observed that the downlink channels require very low receiver sensitivities while the uplink channels require high values of receiver sensitivities at high turbulence since they propagate twice the FSO distance compared to the downlink channels. Furthermore, DPSK modulation performs better than the OOK modulation under strong turbulence conditions as demonstrated in previous studies as well [25,26]. Gamma-Gamma channel is used to model the turbulence of the FSO links.…”

Section: Discussionmentioning

confidence: 62%

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A high bit rate free space optics based ring topology having carrier‐less nodes

et al. 2021

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A free space optics based ring topology that transmits full-duplex data to four different nodes in the ring is proposed. The link is designed such that the four nodes do not require a local optical source to transmit the uplink data. A wavelength division multiplexed signal composed of four different wavelengths each modulated by the downlink baseband data using differential phase shift keying is transmitted towards the nodes. At each node, the downlink baseband data is extracted and the received optical pulses are remodulated by the uplink baseband data using on-off keying modulation format. Each node has a data rate of 10 Gbps and is at a distance of 400 m from the consecutive node. The free space optical link is modelled on the basis of Gamma-Gamma channel model under different turbulence conditions by considering the refractive index structure parameter values of 5 × 10 −15 , 5 × 10 −13 and 5 × 10 −12 m −2∕3 . Bit error rate results are obtained for both the downlink and uplink channels. Finally, power budget analysis is presented to demonstrate the robustness of the link under different weather conditions.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Resultssupporting

confidence: 79%

Section: Discussionmentioning

confidence: 62%

A high bit rate free space optics based ring topology having carrier‐less nodes

et al. 2021

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“…Optical link models have been used to predict the communication performance 7 . The OOK transmitter was made up of a CW DFB laser and a Mach-Zehnder intensity modulator, and the receiver included a pre-amplification stage based on a low-noise Erbium Doped Fiber Amplifier (EDFA).…”

Section: Ook/dpsk Optical Communication Link Simulationsmentioning

confidence: 99%

Assessment of the effective performance of DPSK vs. OOK in satellite-based optical communications

Maho

Faugeron

Kernec

et al. 2019

International Conference on Space Optics — ICSO 2018

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This paper reports on the assessment of the communication performance of DPSK-and OOK-based free-space optical (FSO) links in satellite-based applications, including LEO downlinks, LEO inter-satellite links, and feeder links for GEO Satellites. The performance is assessed by means of simulations as well as transmission experiments at 10 Gbps. The impact of optical filter bandwidth, optical delay-line-interferometer accuracy, frequency offset between transmitter laser and receiver, is quantified. OOK performance critically depends on transmitter extinction ratio, and proves robust to Doppler-induced frequency offsets. DPSK is sensitive to any laser wavelength drift and offset with the DLI response. Nevertheless, compensation of this drift is considered manageable, making it possible to maintain the 3dB advantage of DPSK vs. OOK in practical use conditions. INTRODUCTIONWith their potential for much higher capacity, smaller beam divergence, and lower terminal mass, volume and power, free-space optical (FSO) communication links are anticipated to dramatically exceed the performance of traditional radio-frequency-based solutions in an increasing number of satellite-based applications. In-orbit demonstrations so far were based either on simple On-Off Keying (OOK) with direct detection, or on Binary Phase-Shift Keying (BPSK) with complex homodyne detection 1 . Differential Phase-Shift Keying (DPSK) is compatible with optical demodulation and direct detection, thus offering the advantage of about 3dB higher noise tolerance at affordable added complexity 2 . Even though it has been considered for a long time 3 , only a few forthcoming FSO link demonstrations in space, namely LCRD 4 and JDRS 5 , will operate DPSK, and its effective suitability for other space applications is still under assessment. The present paper aims at evaluating the impact of critical parameters on DPSK transmission performance in satellitebased FSO communications, with a special attention paid to direct-to-the-Earth LEO down-links, inter-satellite links (ISL) in LEO constellations, and feeder links to high-throughput GEO satellites. The specific requirements deriving from the Doppler effect are taken into account. The theoretical performance of 10 Gbps DPSK-and OOK-based optical communication links, established by means of a commercial simulation software tool, are reported with Non-Return-to-Zero (NRZ) coding. Then, NRZ DPSK and OOK transmission experiments at 10 Gbps channel rate are reported and the results are compared. An experimental assessment of the critical link elements has been carried out and their influence on the Bit Error Rate (BER) performance has been quantified. Such parameters include optical filter bandwidth, optical delay-line-interferometer accuracy, frequency offset between transmitter laser and receiver. SATELLITE-BASED FSO COMMUNICATION APPLICATIONSFSO communications hold the potential to offer unrivalled advantages over RF counterparts, mostly stemming from the large difference in wavelength. Moving to higher carrier freque...

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“…In addition, two different duty cycles can be considered for this transmitter: Non-Return-to-Zero (NRZ) and 50% RZ OOK thanks to two Mach Zehnder Modulator (MZM). More information about this communication transmitter can be found in [15]. The propagation emulator channel is modeled by two different variable optical attenuators (VOA): the first is used to introduce the atmospheric attenuation and all static mitigation, the second one is to emulate the random mitigation due to phase screen deformation (Tip/Tilt) and its correction with adaptive optics system.…”

Section: Optical Link Simulationmentioning

confidence: 99%

Optical test bench experiments for 1-Tb/s satellite feeder uplinks

Elayoubi

Rissons

Belmonte

2018

Laser Communication and Propagation Through the Atmosphere and Oceans VII

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Due to expected capacity bottlenecks of exploited microwave technologies, feeder links for data relay or broadband access systems will require the implementation of high capacity optical communication links between space and ground. In this context, it is necessary a detailed investigation of the optical technologies and techniques that could enable the transmission of high data rates at optical frequencies through the Earth's atmosphere, with regard to all kinds of atmospheric phenomena. In particular, the adverse effects of atmospheric turbulence fading are of special relevance to optical communication systems for ground-to-space uplink applications. Although previous studies and experiments have demonstrated the feasibility of such optical links at low data rate, research is still needed to identify technical solutions and strategies adapted to the specific constraints imposed to these high-speed links in order to ensure the required level of performance. Against this background, various test benches have been developed in order to characterize different modulation and detection techniques for optical communication systems prior to be incorporated in the conceptual design of future 1-Tb/s ground-space optical links. The expected performances of such an experimental demonstration are derived based on simulation models taking into account atmospheric turbulence effects, in order to prove the feasibility of reliable ground-space high date rate optical communication links. Our first simulation studies, considering On-Off Keying (OOK) and Differential Phase Shift Keying (DPSK) modulations, have allowed us to understand the complexity of the link and to optimize both the transmitter and the receiver to achieve acceptable performance levels.

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RZ-DPSK optical modulation for free space optical communication by satellites

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 5 publications

References 2 publications

A high bit rate free space optics based ring topology having carrier‐less nodes

A high bit rate free space optics based ring topology having carrier‐less nodes

Assessment of the effective performance of DPSK vs. OOK in satellite-based optical communications

Optical test bench experiments for 1-Tb/s satellite feeder uplinks

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