1,720,986 research outputs found
Analysis and comparison of intermodal coupling coefficient of standard and hollow core few moded fibres
No full textWe compare for the first time the intermodal coupling coefficient of conventional few-moded solid fibres and of hollow-core photonic bandgap fibres and analyse its main contributions. We show that loss reduction in HC-PBGFs also results in reduced coupling coefficients
Low loss, large bandwidth antiresonant hollow-core fiber design for short-reach links
No full textWe present antiresonant hollow-core optical fibre designs for VCSEL-based short-reach transmission applications in the 850nm band. Our simulations show that lower loss and twice the bandwidth of solid, multi-mode, graded index fibres are possible
Thermally insensitive optical fibres and their applications
No full textThe thermal response of the propagation delay and phase accumulated in hollow-core photonic bandgap fibres can be completely suppressed through adequate fibre design. We review here the unprecedented opportunities afforded by this exotic property
Data for "How to make the propagation time through an optical fiber fully insensitive to temperature variations"
No full textData for the manuscript:
Numkam Fokoua, E., and Slavik, R. (2017). How to make the propagation time through an optical fiber fully insensitive to temperature variations. Optica.</span
Dataset for: Exceptional polarization purity in antiresonant hollow-core optical fibres
No full textThis dataset supports the paper:
Taranta, A., Numkam Fokoua, E., Abokhamis Mousavi, S. et al. Exceptional polarization purity in antiresonant hollow-core optical fibres. Nat. Photonics (2020). https://doi.org/10.1038/s41566-020-0633-x</span
Dataset for First demonstration of opposing thermal sensitivities in hollow core fibers with open and sealed ends
No full textThis dataset supports the publication:
R. Slavik, E.R. Numkam Fokoua, M. Bukhstab, Y. Chen,T.D. Bradley, S.R. Sandoghchi, M.N. Petrovich, F. Poletti, and D.J. Richardson,
First demonstration of opposing thermal sensitivities in hollow core fibers with open and sealed ends, Optics Letters
Uploaded Archive (ZIP) includes 12 data files that are purely numerical (.dat) and a README file.</span
Towards manufacture of ultralow loss hollow core photonic bandgap fiber
No full textHollow core photonic bandgap fibers (HC-PBGFs) are a class of optical fibers which guide light in a low index core region surrounded by a triangular lattice of air holes separated by a delicate silica web. The precise nature of this cladding structure requires extremely fine control of the fabrication parameters. While HC-PBGFs have found wide range of exciting research applications the initially anticipated potential for ultralow loss below that of single mode fiber (SMF) has yet to be realized. To date loss figures as low as 1.7 dB/km have been reported, however surface roughness at the core cladding interface limited further loss reduction. The loss of HC-PBGFs can potentially be decreased further by increasing the core dimensions and through optimisation of the fabrication process. To date, the manufacture of HC-PBGFs is reliant upon the two stage stack and draw process. To target ultralow loss below what has been reported to date it has become necessary to ensure repeatability and uniformity in the labor intensive stack and draw process. Repeatability is ensured through rigorous cleanliness throughout preform preparation and by precise fabrication control at each stage of manufacture. Figure 1. a) Scanning electron micrograph of a 19 cell core defect HC-PBGF, b) Attenuation scaling of the photonic bandgap (PBG) versus central guidance wavelength of 19 cell core defect HC-PBGF.Greater than 1 km lengths of HC-PBGF (Fig. 1a) can now be drawn with typical attenuations of the order of 2-3 dB/km and with significantly improved optical bandwidth (~ 100 nm) compared with previously reported. These developments open up HC-PBGF for a range of applications such as telecommunications, laser power delivery, gas sensing and strong light matter interactions, for which they have a clear advantage over conventional fibers. The attenuation scaling of the photonic bandgap (PBG) (solid curves) with central operating wavelength has been investigated in 19 cell core defect fibres (Fig. 1b). The expected attenuation proportional to lambda[-3] relationship (dashed red curve) is observed until the infrared absorption edge of silica (black dot dash curve) is breached and the attenuation increases (green curve). Through strategic fabrication improvements we have achieved repeatable low loss manufacture of HC-PBGFs. Future developments in fabrication control and fiber design will allow the realization of ultralow loss HC-PBGF
Accurate modelling of hollow core photonic bandgap fibre
No full textA modelling tool to accurately reproduce the performance of fabricated hollow-core photonic bandgap fibers from their SEM images is presented. This enables new understanding of the effect of cross-sectional distortions
3D-printed polymer antiresonant waveguides for short-reach terahertz applications
No full textIn this work, we present a 3D-printed waveguide that provides effective electromagnetic guidance in the THz regime. The waveguide is printed using low-cost polycarbonate and a conventional fused deposition modeling printer. Light guidance in the hollow core is achieved through antiresonance, and it improves the energy effectively transported to the receiver compared to free space propagation. Our demonstration adds to the field of 3D-printed terahertz components, providing a low-cost way of guiding terahertz radiation.</p
Dataset for 'Towards high accuracy positioning in 5G via passive synchronization of base stations using thermally-insensitive optical fibers'
No full textDataset supporting a publication in IEEE Access journal:
Zhu W, Numkam Fokoua E, Chen Y, Bradley T, Sandoghchi SR, Ding M, Jasion G, Petrovich M, Poletti F, Zhao M, Richardson D, Slavík R. 2019. Towards high accuracy positioning in 5G via passive synchronization of base stations using thermally-insensitive optical fibers. IEEE Access. (in press)</span
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