Results 61 to 70 of about 35,798 (210)
Free Space Optical Communication Systems [PDF]
, 2009 The main advantage of using optical frequencies in free-space communication systems is the high directivity of the propagating optical beam. (In the context of this chapter, the term “free space” refers to unguided optical communications; exoatmospheric environments are referred to as “space.”) When transmitted from an antenna, electromagnetic waves ...
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Blind Detection for Serial Relays in Free Space Optical Communication Systems
Applied Sciences, 2018 Free-space optical (FSO) communication systems have attracted considerable research interest owing to its high transmission rates and its efficient solution for the last mile problem. Atmospheric turbulence degrades the performance of FSO systems.
Mohamed Elbawab +2 more
doaj +1 more source
Phase Offset Tracking for Free Space Digital Coherent Optical Communication System
Applied Sciences, 2019 The coherent receiving method can improve the sensitivity of an optical signal receiver for free space optical communication system effectively. To implement coherent receiving, the phase offset between the local laser in the receiver and the received ...
Hongwei Li +5 more
doaj +1 more source
, 2011 This paper outlines the experimental investigation of the fog effect on the bit error rate (BER) performance of the free space optical (FSO) communication link under a controlled laboratory environment.
Ghassemlooy, Zabih +5 more
core
, 2007 Optical LEO downlinks from the Japanese OICETS to the optical ground station built by the German Aerospace Center (DLR) near Munich have been performed. This was the first optical LEO downlink on European grounds.
Perlot, Nicolas +13 more
core +1 more source
Multi-element fiber for space-division multiplexed optical communication system [PDF]
, 2014 This paper reviews a novel approach of implementing space-division multiplexing (SDM) based on Multi-element Fiber (MEF) technology. The MEF geometry provides for ultra-low crosstalk between the spatial channels while full compatibility with standard WDM
J. K. Sahu +11 more
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Modelization and Characterization of a CMOS Camera as an Optical Real-Time Oscilloscope
IEEE Photonics Journal, 2020 Complementary Metal-Oxide Semiconductor (CMOS) camera sensors are embedded in many consumer electronics products: thanks to the Rolling Shutter (RS) readout mode, they can detect a time-varying light intensity, which is the key to realize Optical Camera ...
Giulio Cossu +2 more
doaj +1 more source
IEEE Photonics Journal, 2018 A 128 Gbit/s free-space laser link demonstration has been presented. We use a simulated atmosphere system with a tunable 1 km equivalent weak turbulence channel. Eye diagrams and constellation diagrams were observed.
Xianzhu Liu +9 more
doaj +1 more source
Frequency dissemination with free-space optical links
, 2010 Optical clock technology is very certain to be integrated in the next high precision time standards. The demand for higher accuracy in time synchronization makes the use of free-space optical links necessary for frequency dissemination, especially if ...
Mata Calvo, Ramon +2 more
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BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence
, 2009 Free-space optical communications (FSO) propagated over a clear atmosphere suffers from irradiance fluctuation caused by small but random atmospheric temperature fluctuations.
Ghassemlooy, Zabih +3 more
core +1 more source