Nonlinear adaptive control of optical jitter with a new liquid crystal beam steering device

Orzechowski, P.K.; Gibson, Steve; Tsao, Tsu‐Chin; Herrick, Dan; Beazel, V.

doi:10.1109/acc.2008.4587150

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…A significant reduction in jitter was observed using TFL. Besides using FSM, a liquid crystal beam steering device along with non-linear adaptive controller can also reduce jitter fluctuations [335]. It increases the durability of the tilt corrector as it does not involve mechanical moving part and reduces the power requirement of the controller due to its low voltage operation.…”

Section: From Distant Transmittermentioning

confidence: 99%

Optical Communication in Space: Challenges and Mitigation Techniques

Kaushal

Kaddoum

2017

IEEE Commun. Surv. Tutorials

1,288

721

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Abstract-In recent years, free space optical (FSO) communication has gained significant importance owing to its unique features: large bandwidth, license free spectrum, high data rate, easy and quick deployability, less power and low mass requirements. FSO communication uses optical carrier in the near infrared (IR) band to establish either terrestrial links within the Earth's atmosphere or inter-satellite/deep space links or ground-to-satellite/satellite-to-ground links. It also finds its applications in remote sensing, radio astronomy, military, disaster recovery, last mile access, backhaul for wireless cellular networks and many more. However, despite of great potential of FSO communication, its performance is limited by the adverse effects (viz., absorption, scattering and turbulence) of the atmospheric channel. Out of these three effects, the atmospheric turbulence is a major challenge that may lead to serious degradation in the bit error rate (BER) performance of the system and make the communication link infeasible. This paper presents a comprehensive survey on various challenges faced by FSO communication system for ground-to-satellite/satellite-to-ground and inter-satellite links. It also provide details of various performance mitigation techniques in order to have high link availability and reliability. The first part of the paper will focus on various types of impairments that pose a serious challenge to the performance of optical communication system for ground-to-satellite/satellite-to-ground and inter-satellite links. The latter part of the paper will provide the reader with an exhaustive review of various techniques both at physical layer as well as at the other layers (link, network or transport layer) to combat the adverse effects of the atmosphere. It also uniquely presents a recently developed technique using orbital angular momentum for utilizing the high capacity advantage of optical carrier in case of space-based and near-Earth optical communication links. This survey provides the reader with comprehensive details on the use of space-based optical backhaul links in order to provide high capacity and low cost backhaul solutions.

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Section: From Distant Transmittermentioning

confidence: 99%

Optical Communication in Space: Challenges and Mitigation Techniques

Kaushal

Kaddoum

2017

IEEE Commun. Surv. Tutorials

1,288

721

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“…However, the liquid crystal beam steering device exhibits some nonlinear behaviour due to the rate limit and the quantization. A novel adaptive control approach is presented in Orzechowski et al (2008) for the liquid crystal beam steering device by considering these nonlinearities. The experimental results show that incorporating the nonlinearities in the adaptive control scheme yield good performance.…”

Section: Introductionmentioning

confidence: 99%

H∞ controller design for the mitigation of atmospheric effects on the laser beam pointing

Subaşı

Erol

Altıner

et al. 2021

Transactions of the Institute of Measurement and Control

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In this paper, the control of a fast steering mirror, which is the core element of an adaptive optics system, is investigated to suppress the beam jitter. The main source of the jitter is taken as the atmospheric turbulence. The effect of the atmospheric turbulence on the beam jitter is experimentally determined with respect to the two different refractive index structure parameters. The mathematical model of the fast steering mirror based on the atmoshperic turbulence data is obtained using the system identification. In order to overcome implementation problems, the low order proportional-integral-derivative (PID) type controllers, which minimize the [Formula: see text] norm of the closed loop system, are designed in the centralized and the decentralized settings. In addition to this, the fixed order weighted [Formula: see text] controller is based on the frequency characteristics of the atmospheric turbulence that is determined experimentally. Then, in order to show the effectiveness of the proposed low order PID type controller, the designed controllers are compared on the experimental setup. Finally, the simulation and the experimental results are presented. Comparison of advantageous and disadvantageous of centralized and decentralized controller architectures are discussed.

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“…Moreover, Orzechoski et al (2008b) also demonstrated the capabilities of the new liquid crystal device and an adaptive controller to suppress high-bandwidth jitter. Thus efforts to overcome those variations by correcting for the misalignment on the optical axis may enhance the beam stabilization and system performance.…”

Section: Introductionmentioning

confidence: 99%

A Controller Design for Precision Laser-Beam Positioning System

Woo

Kim

2011

International Journal of Optomechatronics

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This article presents a decentralized control strategy for a two-axis precision laser-beam positioning system (PLPS). The PLPS is composed of two integrated subsystems: the telescope system equipped with a FSM platform and the beam alignment system. The strategy included actual data acquisition, system analysis and modeling, digital controller design, and experimental evaluations. The controller had a sensitivity margin of less than À10 dB at 20 Hz on each axis, and maintained the stability of PLPS. The system had moderate robustness, tracked the command signals and output responses without steady-state errors.

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Nonlinear adaptive control of optical jitter with a new liquid crystal beam steering device

Cited by 8 publications

References 26 publications

Optical Communication in Space: Challenges and Mitigation Techniques

Optical Communication in Space: Challenges and Mitigation Techniques

H∞ controller design for the mitigation of atmospheric effects on the laser beam pointing

A Controller Design for Precision Laser-Beam Positioning System

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