High Spectral Efficiency Fiber-Optic Transmission

2005 ◽  
Author(s):  
Guifang Li ◽  
Cheolhwan Kim ◽  
Yan Han
Keyword(s):  
Spectral Efficiency ◽  
Fiber Optic ◽  
High Spectral Efficiency

scholarly journals Constellation Shaping for Fiber-Optic Channels With QAM and High Spectral Efficiency

2014 ◽  
Vol 26 (23) ◽  
pp. 2407-2410 ◽  
Author(s):  
Metodi P. Yankov ◽  
Darko Zibar ◽  
Knud J. Larsen ◽  
Lars P. B. Christensen ◽  
Soren Forchhammer
Keyword(s):  
Spectral Efficiency ◽  
Fiber Optic ◽  
Constellation Shaping ◽  
High Spectral Efficiency

Optical data signals in fiber optic communication links with fading

2019 ◽  
pp. 94-104
Author(s):  
I. Juwiler ◽  
I. Bronfman ◽  
N. Blaunstein
Keyword(s):  
Spectral Efficiency ◽  
Fiber Optic ◽  
Fiber Optic Cable ◽  
Optical Signals ◽  
Dispersion Properties ◽  
Optical Cable ◽  
Time Dispersion ◽  
Communication Links ◽  
Fiber Optic Communication ◽  
Optic Communication

Introduction: This article is based on the recent research work in the field of two subjects: signal data parameters in fiber optic communication links, and dispersive properties of optical signals caused by non-homogeneous material phenomena and multimode propagation of optical signals in such kinds of wired links.Purpose: Studying multimode dispersion by analyzing the propagation of guiding optical waves along a fiber optic cable with various refractive index profiles of the inner optical cable (core) relative to the outer cladding, as well as dispersion properties of a fiber optic cable due to inhomogeneous nature of the cladding along the cable, for two types of signal code sequences transmitted via the cable: return-to-zero and non-return-to-zero ones.Methods: Dispersion properties of multimode propagation inside a fiber optic cable are analyzed with an advanced 3D model of optical wave propagation in a given guiding structure. The effects of multimodal dispersion and material dispersion causing the optical signal delay spread along the cable were investigated analytically and numerically.Results: Time dispersion properties were obtained and graphically illustrated for two kinds of fiber optic structures with different refractive index profiles. The dispersion was caused by multimode (e.g. multi-ray) propagation and by the inhomogeneous nature of the material along the cable. Their effect on the capacity and spectral efficiency of a data signal stream passing through such a guiding optical structure is illustrated for arbitrary refractive indices of the inner (core) and outer (cladding) elements of the optical cable. A new methodology is introduced for finding and evaluating the effects of time dispersion of optical signals propagating in fiber optic structures of various kinds. An algorithm is proposed for estimating the spectral efficiency loss measured in bits per second per Hertz per each kilometer along the cable, for arbitrary presentation of the code signals in the data stream, non-return-to zero or return-to-zero ones. All practical tests are illustrated by MATLAB utility.

Tributary Mapping Multiplexing an Efficient Technique for High Speed Fiber Optic Communication

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Usman Illahi ◽  
Javed Iqbal ◽  
Muhammad Ismail Sulaiman ◽  
Muhammad Alam ◽  
Mazliham Mohd Su'ud
Keyword(s):  
Spectral Efficiency ◽  
High Speed ◽  
Fiber Optic ◽  
Single Channel ◽  
Efficient Technique ◽  
High Dispersion ◽  
Optical Filtering ◽  
Fiber Optic Communication ◽  
Optic Communication ◽  
Dispersion Tolerance

<p>A novel technique of multiplexing called Tributary Mapping Multiplexing (TMM) is<br />applied to a single channel wavelength division multiplexing system and performance is monitored on the basis of simulation results. To elaborate the performance of TMM in this paper, a 4-User TMM system over single wavelength channel is demonstrated. TMM showed significant tolerance against narrow optical filtering as compared to that of conventional TDM at the rate of 40 Gbit/s. The above calculations are made by optical filter bandwidth and dispersion tolerance that was allowed at minimum. The spectral efficiency achieved by this TMM was 1 b/s/Hz and it was executed by using transmitters and receivers of 10 Gbit/s without polarized multiplexing. The high spectral efficiency, high dispersion tolerance and tolerance against strong optical filtering makes TMM an efficient technique for High<br />Speed Fiber Optic Communication.</p>

Waveforms with High Spectral Efficiency for Terahertz Communications

2021 ◽  
Author(s):  
Mohamed Shehata ◽  
Ke Wang ◽  
Julian Webber ◽  
Masayuki Fujita ◽  
Tadao Nagatsuma ◽  
...  
Keyword(s):  
Spectral Efficiency ◽  
Terahertz Communications ◽  
High Spectral Efficiency

High-Spectral-Efficiency Mode-Multiplexed Transmission Over Graded-Index Multimode Fiber

2018 ◽  
Author(s):  
Roland Ryf ◽  
Nicolas K. Fontaine ◽  
Steffen Wittek ◽  
Karthik Choutagunta ◽  
Mikael Mazur ◽  
...  
Keyword(s):  
Spectral Efficiency ◽  
Multimode Fiber ◽  
Graded Index ◽  
High Spectral Efficiency
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