scholarly journals Gratings in Structured Optical Fibres

2008 ◽  
Vol 2008 ◽  
pp. 1-19 ◽  
Author(s):  
John Canning ◽  
Nathaniel Groothoff ◽  
Kevin Cook ◽  
Cicero Martelli ◽  
Alexandre Pohl ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Optical Fibres ◽  
Straightforward Manner ◽  
Step Index ◽  
Near Ir ◽  
Single Material ◽  
Structured Silica

Grating writing in structured optical fibres and their properties and applications are reviewed. To date, most gratings have been written in a straightforward manner into structured fibres containing a photosensitive germanosilicate step-index core. However, gratings have also been written directly into single material, structured silica fibres and into air-clad cores using two and higher-photon processes with both UV and near IR pulsed (nanosecond-femtosecond) light. Given the intrinsic-added functionality possible within a structured optical fibre, structured fibre gratings offer further capabilities for sensors, diagnostics, lasers, and devices.

Measurement of the numerical aperture of a step-index optical fibre

1976 ◽  
Vol 12 (3) ◽  
pp. 63 ◽  
Author(s):  
L. Jeunhomme ◽  
J.P. Pocholle
Keyword(s):  
Optical Fibre ◽  
Numerical Aperture ◽  
Step Index

scholarly journals Parabolic Pulse Generation Using Tapered Microstructured Optical Fibres

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
Natasha Vukovic ◽  
Neil G. R. Broderick ◽  
Francesco Poletti
Keyword(s):  
Pulse Shape ◽  
Pulse Shaping ◽  
Numerical Study ◽  
Pulse Generation ◽  
Optical Fibres ◽  
Step Index ◽  
Index Fibre ◽  
Microstructured Optical Fibres ◽  
Misfit Parameter ◽  
Better Than

This paper presents a numerical study of parabolic pulse generation in tapered microstructured optical fibres (MOFs). Based on our results and the algorithms presented, one can determine the linear taper profile (starting and finishing pitch values and taper length) needed to achieve parabolic pulse shaping of an initial Gaussian pulse shape with different widths and powers. We quantify the evolution of the parabolic pulse using the misfit parameter and show that it is possible to reach values significantly better than those obtained by a step index fibre.

Broadband tunable optical amplification in Rhodamine B-doped step-index polymer optical fibre

1996 ◽  
Vol 129 (5-6) ◽  
pp. 353-357 ◽  
Author(s):  
D G ◽  
L P ◽  
X Z ◽  
T WHITBREAD ◽  
R CHAPLIN
Keyword(s):  
Optical Fibre ◽  
Rhodamine B ◽  
Optical Amplification ◽  
Step Index

scholarly journals Instrumentation of Stratospheric Balloon Straps with Optical Fibre for Temperature and Strain Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1433 ◽  
Author(s):  
Yann Lecieux ◽  
Cyril Lupi ◽  
Dominique Leduc ◽  
Quentin Macé ◽  
Valentin Jeanneau ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Pressure Field ◽  
Numerical Models ◽  
Industrial Process ◽  
Mechanical Tests ◽  
Optical Fibres ◽  
Frequency Shifts ◽  
Strain Monitoring ◽  
Stratospheric Balloon

This article is devoted to the instrumentation, with optical fibres, of the straps holding the envelope of stratospheric balloons. This instrumentation is motivated in the first instance by the need to validate the numerical models used in the design of balloons. It must also be used to measure the temperature along the envelope in order to deduce the pressure field. It is shown at first that the optical fibres can be inserted inside a strap during its fabrication. Different kinds of insertion are considered, none of them perturb the industrial process. The instrumented straps were then submitted to thermal and mechanical tests and the distributed Brillouin frequency shifts were measured. We thus determined the type of insertion to be used according to the parameter (temperature or strain) to be measured and assessed the performance of the measurement chain.

scholarly journals Implications of information theory in optical fibre communications

2016 ◽  
Vol 374 (2062) ◽  
pp. 20140438 ◽  
Author(s):  
Erik Agrell ◽  
Alex Alvarado ◽  
Frank R. Kschischang
Keyword(s):  
Information Theory ◽  
Optical Fibre ◽  
Optical Fibres ◽  
Limited Capacity ◽  
Fibre Optic ◽  
Precious Resource ◽  
Basic Concepts

Recent decades have witnessed steady improvements in our ability to harness the information-carrying capability of optical fibres. Will this process continue, or will progress eventually stall? Information theory predicts that all channels have a limited capacity depending on the available transmission resources, and thus it is inevitable that the pace of improvements will slow. However, information theory also provides insights into how transmission resources should, in principle, best be exploited, and thus may serve as a guide for where to look for better ways to squeeze more out of a precious resource. This tutorial paper reviews the basic concepts of information theory and their application in fibre-optic communications.

Microwave-frequency carriers on optical fibres

1989 ◽  
Vol 329 (1603) ◽  
pp. 23-36 ◽  
Keyword(s):  
Optical Fibre ◽  
Microwave Frequency ◽  
Optical Fibres ◽  
New Approach ◽  
Large Bandwidth ◽  
Design Flexibility ◽  
Baseband Signal ◽  
Microwave Multiplexing ◽  
Voice Data ◽  
Natural Way

The use of microwave carrier frequencies in wideband optical-fibre networks is a promising new approach to the distribution of voice, data and video services to subscribers. This paper discusses the general features and design rules of microwave multiplexed wideband optical-fibre systems and reports on several specific systems developed at GTE Laboratories. These include transmission of 60 frequency modulated (FM) video channels multiplexed on carriers in the 2.7-5.2 GHz band, and the transmission of 20 frequency-shift-keyed (FSK) 100 Mb s -1 digital video channels in the 2-6 GHz band. A hybrid system is also described that transmits a 100 Mb s -1 baseband signal in addition to the 60 FM video channels. These transmission experiments illustrate the large bandwidth capability and design flexibility of microwave-multiplexed lightwave systems. As lightwave systems push towards larger and larger bandwidths, microwave-multiplexing may emerge as the more natural way to exploit the enormous bandwidth of lightwave components.

scholarly journals Prospects for Fibreoptics in Future Telescope Instrumentation

1984 ◽  
Vol 79 ◽  
pp. 617-635 ◽  
Author(s):  
Glenn Lund
Keyword(s):  
Full Advantage ◽  
Optical Fibre ◽  
Optical Systems ◽  
Optical Fibres ◽  
Astronomical Instrumentation ◽  
The Past ◽  
Single Instrument

The importance and applied use of fibreoptics in astronomy has received rapidly growing attention in the past 5 years, particularly for instrumentation where the lightness, flexibility and simplicity of fibres, compared with classical optical systems, can be exploited to full advantage.Angel and Angel et al, who seem to be the first to have used an optical fibre to link a telescope to an instrument, also made the first proposal for the construction of a VLT (FLOAT) consisting of 40 independent mirrors linked to a single instrument via optical fibres. Since that time many authors, including Connes, Serkowski et al, Hubbard et al, Heacox, Hill et al, Vanderriest, Courtes, Tubbs et al, Gray, Lund et al, Schiffer, Watson et al, Vanderriest et al, and Felenbock et al, have proposed or reported various applications involving fibres with astronomical instrumentation.

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