Comparison of modulation formats for free space optics with SelC diversity

2013 ◽  
Author(s):  
Dharmendra Patel ◽  
Jairam More ◽  
Gireesh G. Soni
Keyword(s):  
Free Space ◽  
Free Space Optics ◽  
Modulation Formats ◽  
Space Optics

Analysis of Free Space Optics Link Performance Considering the Effect of Different Weather Conditions and Modulation Formats for Terrestrial Communication

2020 ◽  
Vol 41 (4) ◽  
pp. 463-468 ◽  
Author(s):  
Sanmukh Kaur ◽  
Amayika Kakati
Keyword(s):  
Free Space ◽  
Weather Conditions ◽  
Index Of Refraction ◽  
Free Space Optics ◽  
Modulation Formats ◽  
Space Optics ◽  
Link Performance ◽  
Dense Fog ◽  
Log Normal ◽  
Research Analysis

AbstractFree space optics (FSO) links provide an effectual and efficient way of transmission of data throughout free channels due to its higher bandwidth and inbuilt capability of security. In this research analysis, the FSO link is evaluated on the basis of Q value for different modulation formats and weather conditions. Gamma–Gamma and log-normal scintillation models have been analyzed for different index of refraction in terms of Q factor versus a range of a proposed FSO link. Attenuation increases during the occurrence of different fog conditions, and there might be complete link failure in the case of dense fog and for some of the cloud conditions.

Selection of suitable wavelengths for the dual-wavelength model of free space optics (FSO) systems for high-speed trains

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Abhijot kaur ◽  
Neeraj Sharma ◽  
Jatinder Singh
Keyword(s):  
Free Space ◽  
Communication Systems ◽  
High Speed ◽  
Dual Wavelength ◽  
Free Space Optics ◽  
Radio Communication ◽  
Modulation Formats ◽  
Space Optics ◽  
High Speed Trains ◽  
Selection Of

AbstractFree space optics (FSO) can be used as an alternative to the currently used wireless radio communication systems to meet the increasing demands for the uninterrupted internet connection in High-Speed Trains (HSTs). FSO is less prone to interference, license-free and more secure as compared to Radio Frequency (RF) technology. In this paper, we have compared three different wavelengths (850, 1330, and 1550 nm) for the dual-wavelength model at a bit rate of 10 Gb/s to see which two wavelengths provide better results. The system is studied for return to zero (RZ) and non-return to zero (NRZ) modulation formats this electronic document is a “live” template and already defines the components of your paper [title, text, heads, etc.] in its style sheet.

scholarly journals Hybrid POF/VLC Links Based on a Single LED for Indoor Communications

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 254
Author(s):  
Juan Andrés Apolo ◽  
Beatriz Ortega ◽  
Vicenç Almenar
Keyword(s):  
Optical Power ◽  
Industrial Applications ◽  
Free Space Optics ◽  
Polymer Optical Fiber ◽  
Hybrid Fiber ◽  
Modulation Formats ◽  
Space Optics ◽  
Indoor Communications ◽  
Power Measurements ◽  
Good Agreement

A hybrid fiber/wireless link based on a single visible LED and free of opto-electronic intermediate conversion stages has been demonstrated for indoor communications. This paper shows the main guidelines for proper coupling in fiber/air/detector interfaces. Experimental demonstration has validated the design results with very good agreement between geometrical optics simulation and received optical power measurements. Different signal bandwidths and modulation formats, i.e., QPSK, 16-QAM, and 64-QAM, have been transmitted over 1.5 m polymer optical fiber (POF) and 1.5 m free-space optics (FSO). Throughputs up to 294 Mb/s using a 64-QAM signal have been demonstrated using a commercial LED, which paves the way for massive deployment in industrial applications.

scholarly journals A Survey of Free Space Optics (FSO) Communication Systems, Links, and Networks

IEEE Access ◽  
2020 ◽  
pp. 1-1
Author(s):  
Samir A. Al-Gailani ◽  
Mohd Fadzli Mohd Salleh ◽  
Ali A. Salem ◽  
Redhwan Q. Shaddad ◽  
Usman Ullah Sheikh ◽  
...  
Keyword(s):  
Free Space ◽  
Communication Systems ◽  
Free Space Optics ◽  
Space Optics
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