Results 21 to 30 of about 7,939 (303)

Breakthroughs in Photonics 2012: Generation of Modulated Optical Signals for Optical Fiber Communications

IEEE Photonics Journal, 2013
Recent advances in transmitters for optical fiber communications that exploit the powerful capabilities of digital signal processing and digital-to-analog conversion are reviewed.
J. C. Cartledge, A. S. Karar
doaj   +1 more source

Lambertian source modelling of free space optical ground-to-train communications [PDF]

, 2012
There is a increasing demand for high speed data services while travelling on trains and other means of public transportation. Hence, an alternative technology to radio frequency (RF) communications called free space optics (FSO) could be used to provide
Ghassemlooy, Zabih, H. Le Minh, Paudel, Rupak, R. Paudel, Z. Ghassemlooy, E. Leitgeb, Leitgeb, Erich, Rajbhandari, Sujan, S. Rajbhandari, Le Minh, Hoa   +9 more
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Multi-user indoor optical wireless communication system channel control using a genetic algorithm [PDF]

, 2011
A genetic algorithm controlled multispot transmitter is demonstrated that is capable of optimising the received power distribution for randomly aligned single element receivers in multiple fully diffuse optical wireless communications systems with ...
M.S. Leeson, R.J. Green, E.L. Hines, Leeson, Mark S., Hines, Evor, Higgins, Matthew D., Green, Roger, M.D. Higgins   +7 more
core   +1 more source

Performance Analysis of MPSK FSO Communication Based on the Balanced Detector in a Fiber-Coupling System

IEEE Access, 2019
An average bit error ratio (ABER) performance model for multiple phase shift keying (MPSK) based on a balanced detector with a fiber is presented in the free-space link for the first time.
Haifeng Yao, Xiaolong Ni, Chunyi Chen, Bo Li, Xianglian Feng, Xianzhu Liu, Zhi Liu, Shoufeng Tong, Huilin Jiang   +8 more
doaj   +1 more source

Receiver alignment dependence of a GA controlled optical wireless transmitter [PDF]

, 2009
A genetic algorithm controlled multispot transmitter is demonstrated to be capable of optimizing the received power distribution for single element receivers in fully diffuse mobile indoor optical wireless systems.
Leeson, Mark S., Higgins, Matthew D., Green, Roger   +2 more
core   +1 more source

Synchronization of a WDM Packet-Switched Slotted Ring [PDF]

, 2007
In this paper, we present two different strategies of slot synchronization in wavelength-division-multiplexing (WDM) packet-switched slotted-ring networks.
Carzaniga, D., S. BREGNI, Pattavina, A., R. GAUDINO, PATTAVINA, ACHILLE, Gaudino, Roberto, BREGNI, STEFANO, A. PATTAVINA, Antonino, A., D. CARZANIGA, Bregni, S., A. ANTONINO   +11 more
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Signal Degradation and Excess Insertion Loss of Optical Mach–Zehnder Modulators in the Presence of Electronic Dispersion Compensation

IEEE Photonics Journal, 2017
Mach–Zehnder (MZ) modulators are widely used in optical transmitters to generate high-speed optical signals. With electronic dispersion compensation (EDC), the driving signals to MZ modulators change from digital to analog, or continuous waveforms.
Xiatao Huang, Xingwen Yi, Mingyue Zhu, Jing Zhang, Zengjie Zhang, Yang Song, Kun Qiu   +6 more
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Use of Negative Impedance Converters for Bandwidth Extension of Optical Transmitters

IEEE Open Journal of Circuits and Systems, 2021
The design and advantages of a novel light emitting diode (LED) bandwidth extension technique, based on the adoption of negative impedance converters (NICs), are discussed in the context of visible light communication systems.
Amany Kassem, Izzat Darwazeh
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Performance of coherent optical square-16-QAM-systems based on IQ-transmitters and homodyne receivers with digital phase estimation [PDF]

, 2022
10 S.The potential for higher spectral efficiency and recent activities in the area of coherent optical systems raise the interest in new multi-level modulation formats for optical transmission.
Seimetz, M.
core   +1 more source

Multiple Transmitters for Gain Saturated Pre-Amplified FSO Communication Systems Limited by Strong Atmospheric Turbulence and Pointing Error

IEEE Access, 2023
The use of multiple transmitters in a turbulent free-space optical (FSO) communication link can enhance the systems performance because greater received power can improve receiver sensitivity. Nevertheless, the effect of having more power at the receiver
Jeremiah Oluwatosin Bandele, Ayodeji Olalekan Salau, Mmoloki Mangwala, Adamu Murtala Zungeru   +3 more
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