The Role and Challenges of Free-space Optical Systems

Chaudhary, Sushank; Amphawan, Angela

doi:10.1515/joc-2014-0004

Cited by 96 publications

(45 citation statements)

References 34 publications

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“…Numerous advantages of laser such as higher band width, minimal power requirements, marginal electro-magnetic interference (EMI) encouraged it's application in radio frequency (RF) technology [2,3]. Laser being coherent finds its application in free space communication known as Optical Wireless Communication (OWC) and further was used for communication between satellites more commonly known as Inter Satellite Optical Wireless Communication (Is-OWC).…”

Section: Introductionmentioning

confidence: 99%

“…Though the vacuum is assumed to be perfect, path loss which increases as square f the distance is huge. Further Is-OWC links are sensitive for pointing errors which may arise due to misalignment, vibrations or tracking errors [22][23][24][25][26][27][28][29][30][31][32][33][34][35] [2][3][4][5][6][7][8][9][10][11][12]. In our work OFDM-DPSK-Is-OWC system is designed to transmit 10 Gbps data over a distance of 10,000 Km under the impact of turbulence.…”

Section: Introductionmentioning

confidence: 99%

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High Speed and Long Reach DPSK-OFDM-Is-OWC under Impact of Space Turbulences

Sharma¹,

Kumar²,

Chandni³

2018

IJCA

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Inter-satellite communication is a free-space optical technology which is used to establish communication between satellites in space. This work is focused on the transmission of 10 Gbps data over 10,000 km inter-satellite communication link by incorporating orthogonal frequency division multiplexing scheme. The performance of proposed system is evaluated in terms of signal-to-noise ratio, total received power, radio-frequency spectrum and constellation diagrams. KeywordsInter-satellite communication (Is-OWC), Orthogonal frequency division multiplexing (OFDM), Differential phase shift key (DPSK).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Speed and Long Reach DPSK-OFDM-Is-OWC under Impact of Space Turbulences

Sharma¹,

Kumar²,

Chandni³

2018

IJCA

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“…The low complexity projected receiver as well as LMS algorithmic rule, has a higher potency than typical methods (without channel estimation & LMMSE) and it will add lower quantity of SNRs. Previous studies on Is-OWC have reported certain challenges such as beam divergence, and receiving and transmitting pointing errors which further limit transmission distance and capacity [24].When the transmitter and the receiver are not aligned, it leads to power reduction at the receiver side. These further results in pointing losses as shown by the equation below [25][26][27][28][29][30][31][32][33][34][35][36]:…”

Section: Introductionmentioning

confidence: 99%

Study of Various Challenges In IS-OWC – A Review

Sharma¹

2017

IJRASET

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Inter-satellite optical-wireless communication systems (IsOWC), one of the important applications of FSO/WSO technology, will be deployed in space in the near future. The IsOWC systems provide a high bandwidth, small size, light weight, low power and low cost alternative to present microwave satellite systems. In this paper we have reported the challenges of Is-OWC Key words: Is-OWC (inter-satellite optical wireless communication), LOS (line of sight), I.INTRODUCTION Inter-satellite optical wireless communication has attained recognition in small time due to its infinite advantages as compared to its RF counterpart. This study includes system description of Is-OWC system with study of different parameters which effects system performance along with applications and advantages of utilizing this technology. Now we are in the twenty first century, the era of 'Information technology'. There is no doubt that information technology has had an exponential growth through the modern telecommunication systems. A communication system transmits information from one place to another, whether separated by a few kilometers or by transoceanic distances. Information is often carried by an electromagnetic carrier wave whose frequency can vary from a few megahertz to several hundred terahertzes. Optical communication systems use high carrier frequencies (100 THz) in the visible or near-infrared region of the electromagnetic spectrum. Fiber-optic communication systems are light wave systems that employ optical fibers for information transmission. One key problem for developing practical optical communications systems was the lack of good transmission medium.[1] Fig. 1 shows inter-satellite communication and optical communication.

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“…It transmits laser carrying signals through a free-space channel with high capacity, high bandwidth, and a flexible network [1]. FSO is one of the most promising alternative schemes for addressing the 'last mile' communication bottleneck in emerging broadband-access markets [2]. However, atmospheric disturbance can easily affect the laser beam.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Atmospheric Compensation in Free-Space Optical Communication

Wang¹,

Zhao²

2016

Journal of the Optical Society of Korea

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Since the direct-gradient (DG) method uses the Shack-Hartmann wave front sensor (SH-WFS), based on the phase-conjugation principle, for atmospheric compensation in free-space optical (FSO) communication, it cannot effectively correct high-order aberrations. While the stochastic parallel gradient descent (SPGD) can compensate the distorted wave front, it requires more calculations, which is sometimes undesirable for an FSO system. A hybrid compensation (HC) method is proposed by properly using the DG method and SPGD algorithm to improve the performance of FSO communication. Simulations show that this method can well compensate wave-front aberrations and upgrade the coupling efficiency with few computations, preferable correction results, and rapid convergence rate.

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The Role and Challenges of Free-space Optical Systems

Cited by 96 publications

References 34 publications

High Speed and Long Reach DPSK-OFDM-Is-OWC under Impact of Space Turbulences

High Speed and Long Reach DPSK-OFDM-Is-OWC under Impact of Space Turbulences

Study of Various Challenges In IS-OWC – A Review

Hybrid Atmospheric Compensation in Free-Space Optical Communication

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