Free Space Optical Communication System under Different Weather Conditions

AbstractFree space optical communication systems (FSO’s) have surfaced as admired means of communication in the past few years. High speed of operation, low bandwidth requirements and system reliability are the major factors responsible for their wide range of applications. These communication systems use air as a medium of transmission. Since there is no component like fiber or cable, but air is only medium, the variations in atmospheric conditions play a vital role in performance of these networks. The reason behind is that the conditions like presence of humidity, haze, snowfall, rain, dust or smoke changes the attenuation coefficient of medium. The raised attenuation levels results in increased losses and need to be carefully monitored. The present work analyzes the influence of rain on the performance of FSO network in terms of quality of transmission. The paper discusses the impact of rainfall on attenuation coefficient of air. Then impact of this attenuation on network transmission is presented in terms of BER and Q-factor. In order to demonstrate the impact, BER and Q-value is calculated for 10 Gbps FSO link for clear weather and rainfall conditions.

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From Mirrors to Free-Space Optical Communication—Historical Aspects in Data Transmission

Future Internet ◽

10.3390/fi12110179 ◽

2020 ◽

Vol 12 (11) ◽

pp. 179

Author(s):

Magdalena Garlinska ◽

Agnieszka Pregowska ◽

Karol Masztalerz ◽

Magdalena Osial

Keyword(s):

Optical Communication ◽

Data Transmission ◽

Free Space ◽

Communication Systems ◽

High Speed ◽

Rapid Development ◽

Free Space Optical Communication ◽

Atmospheric Conditions ◽

Free Space Optical ◽

Space Optical Communication

Fast communication is of high importance. Recently, increased data demand and crowded radio frequency spectrum have become crucial issues. Free-Space Optical Communication (FSOC) has diametrically changed the way people exchange information. As an alternative to wire communication systems, it allows efficient voice, video, and data transmission using a medium like air. Due to its large bandwidth, FSOC can be used in various applications and has therefore become an important part of our everyday life. The main advantages of FSOC are a high speed, cost savings, compact structures, low power, energy efficiency, a maximal transfer capacity, and applicability. The rapid development of the high-speed connection technology allows one to reduce the repair downtime and gives the ability to quickly establish a backup network in an emergency. Unfortunately, FSOC is susceptible to disruption due to atmospheric conditions or direct sunlight. Here, we briefly discuss Free-Space Optical Communication from mirrors and optical telegraphs to modern wireless systems and outline the future development directions of optical communication.

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High-speed Orbital Angular Momentum Multiplexed Free-space Optical communication systems

10.20944/preprints201808.0355.v1 ◽

2018 ◽

Author(s):

Zhen Qu ◽

Ivan Djordjevic

Keyword(s):

Angular Momentum ◽

Orbital Angular Momentum ◽

Optical Communication ◽

Free Space ◽

Communication Systems ◽

High Speed ◽

Free Space Optical Communication ◽

Free Space Optical ◽

Optical Communication Systems ◽

Space Optical Communication

We review recent progress in high-speed orbital angular momentum (OAM) multiplexed free-space optical communication systems. The outdoor atmospheric turbulence is emulated by an indoor turbulence emulator, which is based on split-step beam propagation method. Adaptive optics, channel coding, Huffman coding combined with LDPC coding, and spatial offset are used for turbulence mitigation; while OAM multiplexing and wavelength-division multiplexing (WDM) are applied to boost aggregate capacity.

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