Space-Ground Coherent Optical Links: Ground Receiver Performance With Adaptive Optics and Digital Phase-Locked Loop

Paillier, Laurie; Bidan, Raphaël Le; Conan, Jean-Marc; Artaud, Géraldine; Védrenne, Nicolas; Jaouën, Yves

doi:10.1109/jlt.2020.3003561

Cited by 26 publications

(21 citation statements)

References 36 publications

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“…In our study, for the sake of simplicity in the analysis, the feedback channel carrying CSI information is assumed to be reliable 1 . In addition, the temporal coherence times of considered FSO [36] and RF [37] links, i.e., in the order of tens of milliseconds, are relatively long in comparison with the time slot duration, including the data transmission and feedback time (order of several milliseconds). Due to the slowly time-varying nature of fading channels, CSIs are still up-to-date information when arriving at the HAP and satellite.…”

Section: A Adaptive Transmission Schemesmentioning

confidence: 99%

“…Also, P t = 20 dBm, CLWC = 6 mg/m 3 , and different HAP's divergence angles, i.e., θ HAP = 1.5 mrad, 2 mrad, and 2.5 mrad, are considered. It is noted that the obtained results of BER are based on their exactform expressions found in (36) and (41) for respectively the proposed and conventional designs. As expected, our proposed design offers a lower average BER performance compared to the conventional one, even with higher achievable datarate transmissions.…”

Section: Conventional Hybrid Fso/rf Designmentioning

confidence: 99%

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On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

Nguyen

Dang

et al. 2022

IEEE Photonics J.

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This paper addresses the design of hybrid freespace optical/radio frequency (FSO/RF) systems for a highaltitude platform (HAP)-aided relaying satellite communication for mobile networks supported by unmanned aerial vehicle (UAV). While prior work primarily focused on fixed-rate design, which frequently switches between FSO and RF lead reduced the system performance, we propose a rate adaptation design that gradually adjusts the data rate in each link when its channel state fluctuates, under a target bit error rate (BER) constraint. The proposed design's downlink performance is analyzed, taking into account many challenging issues, including beam spreading loss, cloud attenuation, statistical behaviors of the atmospheric turbulence in the dual-hop channel, and pointing misalignment due to the UAV hovering. Different performance metrics are analytically derived based on channel modelings, including outage probability, average transmission rate, and achievable spectrum efficiency. In addition, the average system BER, which satisfies the design constraint, is also numerically obtained. The results quantitatively confirm the effectiveness of our proposed system under the impact of UAV hovering misalignment and atmospheric-related issues like clouds and turbulence. Finally, Monte-Carlo simulations validate the accuracy of theoretical results.

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Section: A Adaptive Transmission Schemesmentioning

confidence: 99%

Section: Conventional Hybrid Fso/rf Designmentioning

confidence: 99%

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

Nguyen

Dang

et al. 2022

IEEE Photonics J.

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“…For free space satellite to ground communications phase locked loop (PLL) and optical phase locked loop (OPLL), OCL are widely used. Recently, design of PLL and OCL based coherent receivers are reported, which can efficiently recover message signals in presence of atmospheric turbulence, laser phase noise, frequency offset between transmitted and received laser signals (7) . Design of low cost and highly efficient semiconductor laser based integrated coherent optical receiver for the recovery of QPSK and BPSK signals is also reported recently (8) .…”

Section: Introductionmentioning

confidence: 99%

“…So, research on improvement and designing of PLL based homodyne receivers for electronic and fibre optic communications is increased day by day. Although, different new designs of OPLL, DOPLL, OCL have been proposed recently (7)(8)(9)(10) , but effect of time delay on the system dynamics have not been discussed with proper attention. It is impossible to design these devices with no time delay.…”

Section: Introductionmentioning

confidence: 99%

Effect of High Frequency Gain on the Performance of Optical Costas Loop in Face of Loop Delay

Dandapathak¹

2022

IJST

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Objectives: Optical costas loops (OCLs) are widely used in optical communication as homodyne receivers. Due to use of different electronic counterparts and fibre optic cable inherent loop delay always presents in the system. The steady state behaviours of optical costas loop are highly affected by the presence of loop delay. Different nonlinear behaviours may be observed due to presence of delay. There are two main objectives of this article. Firstly, how OCL can be operated as stable receiver up to some large value of loop delay by using a proportional plus integrating type loop filter (LF). Secondly, how a controlled chaotic optical signal can be generated from OCL by choosing the system parameters in correct manner. Methods: To investigate system behaviours of OCL both analytical and numerical methods have been used. Stability analysis of OCL has been done by Routh-Hurwitz method. From stability analysis, it is possible to predict the stable and unstable behaviour of the OCL in presence of delay and how system stability can be improved by high frequency gain value of LF. Numerical methods have also been used to solve the nonlinear equation of OCL to observe real time behaviours. Findings: Analytical findings show that loop stability can be improved by increasing the value of high frequency gain of LF. For large value of loop delay, chaotic oscillation of phase error may be observed in OCL. The chaotic oscillation can also be controlled by high frequency gain with certain extent value of loop delay. All the numerical findings have been properly verified with numerical results. Novelty: This article describes how effects of loop delay can be controlled to run OCL in steady as well as in unsteady state. From designer's point of view this study would be helpful to choose correct values of system parameters to improve the performance of OCL in optical communication. It also gives the idea for generation of chaotic optical signal, which is used in secured communications.

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“…Homodyne optical phase-locked loop is one kind of optical phase-locked loops (OPLLs) applied in optical field, such as coherent optical communications [1,2,3,4,5], resonant fiber optical gyroscope (RFOG) [6,7,8,9,10], and so on. Via feedback technology, phase locking between input optical signal and local optical signal can be achieved by homodyne OPLL.…”

Section: Introductionmentioning

confidence: 99%

Z-domain modeling methodology for homodyne digital optical phase-locked loop

Chen

Liu

Zhang

et al. 2021

IEICE Electron. Express

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Homodyne optical phase-locked loop (OPLL) is one kind of PLLs applied in optical field to achieve phase locking between two optical signals. Although there are already some software emulation and s-domain modeling methods studied for homodyne OPLL, few studies about z-domain model of OPLL are reported. For homodyne digital OPLL(DOPLL), the performance of homodyne DOPLL can be analyzed more accurately by z-domain model. So a z-domain modeling methodology for homodyne DOPLL is proposed in the letter. In the proposed methodology, optical related components and analog to digital converter (ADC) are treated as one group. Then with formula transformation, z-domain model for homodyne OPLL is built successfully. Finally, a case study is given, several simulations by z-domain model and Simulink behavioral model are made with the same design parameters. These simulation results agree very well and verify the correctness of z-domain model.

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Space-Ground Coherent Optical Links: Ground Receiver Performance With Adaptive Optics and Digital Phase-Locked Loop

Cited by 26 publications

References 36 publications

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

On the Design of Rate Adaptation for Relay-Assisted Satellite Hybrid FSO/RF Systems

Effect of High Frequency Gain on the Performance of Optical Costas Loop in Face of Loop Delay

Z-domain modeling methodology for homodyne digital optical phase-locked loop

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