Practical low-loss waveguide for long-distance telecommunications

1965 ◽  
Vol 1 (1) ◽  
pp. 14 ◽  
Author(s):  
H.E.M. Barlow ◽  
H.G. Effemey ◽  
S.H. Taheri
Keyword(s):  
Low Loss ◽  
Long Distance

Ultra-low Loss with Single Mode Polymer-Based Photonic Crystal Fiber for THz Waveguide

2019 ◽  
Vol 40 (4) ◽  
pp. 411-417 ◽  
Author(s):  
Shuvo Sen ◽  
Md. Shadidul Islam ◽  
Bikash Kumar Paul ◽  
Md. Ibadul Islam ◽  
Sawrab Chowdhury ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
Effective Area ◽  
Low Loss ◽  
Long Distance ◽  
Material Loss ◽  
Crystal Fiber ◽  
The Core ◽  
Power Fraction

Abstract In this article, a low loss circular photonic crystal fiber (C-PCF) has been suggested as Terahertz (THz) waveguide. Both the core and cladding vicinity of the suggested PCF are constituted by circular-shaped air holes. The optical properties such as effective material loss, effective area, core power fraction and V-parameter have numerically been probed by utilizing full vectorial finite element method (FEM) with perfectly matched layers (FMLs) boundary condition. The reported PCF reveals low absorption loss and large effective area of 0.04 cm−1 and 2.80×10−07 m2 respectively at 1 THz operating frequency. In addition, the core power fraction of the fiber is about 50.83 % at the same activation frequency. The V-parameter shows that the proposed PCF acts as a single mode over 0.70 to 1.15 THz frequency. So, the reported PCF offers the best performance in long distance communication applications.

Microwires and microtwists from X-shaped conjugated molecules as low-loss, long distance photo waveguide materials

2011 ◽  
Vol 12 (3) ◽  
pp. 453-460 ◽  
Author(s):  
Ting Lei ◽  
Hai-Bo Chen ◽  
Jie Yin ◽  
Shan Huang ◽  
Xing Zhu ◽  
...  
Keyword(s):  
Low Loss ◽  
Long Distance ◽  
Conjugated Molecules

scholarly journals Entangling single atoms over 33 km telecom fibre

2022 ◽  
Author(s):  
Tim van Leent ◽  
Matthias Bock ◽  
Florian Fertig ◽  
Robert Garthoff ◽  
Sebastian Eppelt ◽  
...  
Keyword(s):  
Large Scale ◽  
Quantum Communication ◽  
Frequency Conversion ◽  
Single Atom ◽  
Quantum Network ◽  
Low Loss ◽  
Quantum Repeater ◽  
Long Distance ◽  
Quantum Networks ◽  
Network Links

Abstract Heralded entanglement between distant quantum memories is the key resource for quantum networks. Based on quantum repeater protocols, these networks will facilitate efficient large-scale quantum communication and distributed quantum computing. However, despite vast efforts, long-distance fibre based network links have not been realized yet. Here we present results demonstrating heralded entanglement between two independent, remote single-atom quantum memories generated over fibre links with a total length up to 33 km. To overcome the attenuation losses in the long optical fibres of photons initially emitted by the Rubidium quantum memories, we employ polarization-preserving quantum frequency conversion to the low loss telecom band. The presented work represents a milestone towards the realization of efficient quantum network links.

scholarly journals Long-Distance Optical Fiber Cable Installation System Using Automatic Control Puller

1998 ◽  
Vol 10 (3) ◽  
pp. 229-234
Author(s):  
Takenori Morimitsu ◽  
◽  
Masao Terasawa ◽  
Keyword(s):  
Optical Fiber ◽  
Automatic Control ◽  
Small Diameter ◽  
Light Weight ◽  
Low Loss ◽  
Long Distance ◽  
Unit Distance ◽  
Optical Fiber Cable ◽  
Pulling Force

To fully use optical fiber cable features such as low loss, small diameter, and light weight, cables are installed over the longest possible unit distance using pullers installed in intermediate manholes to distribute cable pulling force. An optical fiber cable pulling system has been developed that measures loading tension on the cable using tension sensors and automatically controls pulling speed so that tension is appropriate.

Progress in Halide Glass Fibers

1988 ◽  
Vol 125 ◽  
Author(s):  
Ishwar. D. Aggarwal
Keyword(s):  
Optical Fibers ◽  
Glass Fibers ◽  
Focal Plane Arrays ◽  
Power Delivery ◽  
Low Loss ◽  
Long Distance ◽  
Silica Fibers ◽  
Communication Links ◽  
Radiation Resistant ◽  
Overall Reliability

ABSTRACTFluoride glasses are being considered for use in long distance, mid-infrared transmitting optical fibers. The multi-phonon edge of these fibers is shifted to longer wavelengths compared to silica fibers. The intrinsic loss is therefore lower (< 0.01 dB/km) and occurs at about 2.5 microns. Applications for these fibers include ultra-low loss communication links, radiation resistant links, remoting of IR focal plane arrays and IR power delivery. In addition, this ultra low loss optical fiber may be used for fiber guided missiles with capability for distances longer than 500 km. Most of the interest however, has been focused on development of ultra long (thousands of kilometers), repeaterless communication links. Such repeaterless links may decrease system cost and cable weight, while increasing overall reliability and ease of repair compared to silicate optical fibers.

UHV AC Placement Selection Method Based on the Short Circuit Current Coordination

2015 ◽  
Vol 738-739 ◽  
pp. 1280-1284
Author(s):  
Lin Lin Yu ◽  
Yu Fei Rao
Keyword(s):  
Computational Analysis ◽  
Short Circuit ◽  
Power Grid ◽  
Short Circuit Current ◽  
Selection Method ◽  
Impact Point ◽  
Empirical Methods ◽  
Low Loss ◽  
Long Distance ◽  
Ac Transmission

UHV AC transmission has a high transmission capacity, long distance, low loss, covers save etc. significant advantages, so it’s widely used in our country. But the placement of the UHV which was sent to select still major use projects empirical methods. This method lacks clarity and systematic. Meanwhile, it is difficult to adapt to complex changes in the overall demand for power grid. This paper developed a UHV AC placement selection method based on short-circuit current coordination. According to UHV grid and nearby 500kV grid short-circuit current coordination constraint, unreasonable impact point sent plan was excluded so that greatly unnecessary computational analysis was reduced. This can quickly determine the placement of reasonable UHV AC transmission project plan.

scholarly journals High rate, long-distance quantum key distribution over 250 km of ultra low loss fibres

2009 ◽  
Vol 11 (7) ◽  
pp. 075003 ◽  
Author(s):  
D Stucki ◽  
N Walenta ◽  
F Vannel ◽  
R T Thew ◽  
N Gisin ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
High Rate ◽  
Low Loss ◽  
Long Distance
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