Free Space Ground to Satellite Optical Communications Using Kramers–Kronig Transceiver in the Presence of Atmospheric Turbulence (original) (raw)
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Free space optical communications system performance under atmospheric scattering and turbulence for 850 and 1550 nm operation, 2016
In this work, a free space optical communications (FSO) link is proposed and utilized to explore and evaluate the FSO link performance under the joint occurrence of the atmospheric scattering and turbulence phenomena for 850 and 1550 nm operation. Diffraction and non diffraction-limited systems are presented and evaluated for both wavelengths' operation, considering far-field conditions under different link distances. Bit error rate, pointing error angles, beam divergence angles, and link distance are the main performance indicators that are used to evaluate and compare the link performance under different system configurations and atmospheric phenomena combinations. A detailed study is performed to provide the merits of this work. For both far-field diffraction-limited and non diffraction-limited systems, it is concluded that 1550 nm system operation is better than 850 nm for the whole presented joint occurrences of atmospheric scattering and turbulence.
Analysis of free space optical link in turbulent atmosphere
Optik - International Journal for Light and Electron Optics, 2014
Free space optical (FSO) communication is an upgraded supplement to the existing wireless technologies. FSO technology provides vast modulation bandwidth, unlicensed spectrum, cost effective deployment, low power consumption and less mass requirement. Today, researchers are preliminary focused to use the free space communication systems for inter satellites links. In this paper, the performance analysis of FSO communication link in weak atmospheric turbulence has been analyzed for different atmospheric transmission windows using OOK modulation. The analysis has been done using bit error rate as the performance metric. The effect of attenuation on the link performance has been investigated by varying distance between transmitter and receiver for a given power and data rate. Further, BER performance analysis has been carried out for varying data rate and transmitted power. Also, the effect of attenuation on received optical power has been studied. The work has been performed in OptSim environment.
Free space optical (FSO) communication technology is a promising candidate for next generation broadband networking, due to its large bandwidth potential, unlicensed spectrum, excellent security and quick and inexpensive setup and used to solve the “last mile” problem to bridge the gap between the end user and the fiber-optic infrastructure already in place [1]-[2]. Its unique properties make it also appealing for a number of other applications, including metropolitan area network extensions, local area network connectivity, fiber backup, back-haul for wireless cellular networks, redundant link and disaster recovery. In FSO communications, optical transceivers communicate directly through the air to form point-to-point line-of-sight (LOS) links. One major impairment over FSO links is the atmospheric turbulence, which occurs as a result of the variations in the refractive index due to inhomogeneities in temperature and pressure fluctuations [3]-[4]. Atmospheric turbulence has been st...
Atmospheric Turbulence Effect on Free Space Optical Communications
This work discusses the effect of atmospheric turbulence on wavelengths transmission in free space. The Rytov variance calculated for plane and spherical waves, were Rytov variance of spherical waves less than from plane waves, on the other hand in spherical waves the values of wavelength 1550 nm less than from the other wavelengths. Scintillation attenuation was calculated depends on Rytov approximation for wavelengths (1550, 850, 633, 532) nm, scintillation attenuation values of the wavelength 1550 nm less than from the other wavelengths. The wavelength 1550nm has a good signal to noise ratio(S/N) from the other wavelengths. The distance between the transmitter and receiver links was (0-1000) m, we take into account the refractive index structure parameter at different turbulence (10 -16 low, 10 -15 medium, 10 -14 high) m -2/3 for all calculations.
Study of the Atmospheric Turbulence in Free Space Optical Communications
In this paper the effect of atmospheric turbulence on free space optical (FSO) communications is investigated experimentally by designing a turbulence simulation chamber. The distributions of bits '0' and '1' levels are measured with and without turbulence. The bit error rate (BER) is then obtained from the distributions. The temperature gradient within the channel is less than 6 °C resulting in turbulence of log irradiance variance of 0.002. The received average signal is measured and used to characterise the simulated turbulence strength. We then evaluated the BER with turbulence and found that from an error free link in the absence of turbulence, the BER increased significantly to about 10 -4 due to the turbulence effect.
Free Space Optical Communications — Theory and Practices
Contemporary Issues in Wireless Communications, 2014
FSO is a line-of-sight technology that uses lasers to provide optical bandwidth connections or FSO is an optical communication technique that propagate the light in free space means air, outer space, vacuum, or something similar to wirelessly transmit data for telecommunication and computer networking. Currently, FSO is capable of up to 2.5 Gbps [1] of data, voice and video communications through the air, allowing optical connectivity without requiring fiberoptic cable or securing spectrum licenses. Operate between the 780-1600 nm wavelengths bands and use O/E and E/O converters. FSO requires light, which can be focused by using either light emitting diodes (LEDs) or lasers (light amplification by stimulated emission of radiation). The use of lasers is a simple concept similar to optical transmissions using fiberoptic cables; the only difference is the transmission media. Light travels through air faster than it does through glass, so it is fair to classify FSO as optical communications at the speed of the light. FSO communication is considered as an alternative to radio relay link line-of sight (LOS) communication systems. This chapter is concentrate on ground-to-ground free-space laser communications. FSO components are contain three stages: transmitter to send of optical radiation through the atmosphere obeys the Beer-Lamberts`s law, free space transmission channel where exist the turbulent eddies (cloud, rain, smoke, gases, temperature variations, fog and aerosol) and receiver to process the received signal. Typical links are between 300 m and 5 km, although longer distances can be deployed such as 8-11 km are possible depending