«optical fibre»
۴۷۵۱ نتیجهRaman Spectra of a PMMA Microstructured Optical Fibre and Direct Measurement of Its Gain Coefficient
A polymethylmethacrylate (PMMA) microstructured polymer optical fiber (mPOF) is fabricated and characterized. Using the cut-back technique the fiber loss is measured which is higher than the step-index silica fibers. Through a novel experimental scheme, the backward Stokes spectr
Optical Fibres With Depressed Claddings For Suppression of Coupling into Cladding Modes in Fibre Bragg Gratings
A new method for suppression of coupling from guided optical modes into cladding modes in an optical fibre Bragg grating using a fibre with a strongly depressed cladding is proposed. Strong suppression of the coupling has been demonstrated both theoretically and experimentally. O
Fusion splicing of silicon optical fibres
The first splicing experiments between silicon optical fibres (SOFs) and conventional fibres are investigated. An optimized fusion splicing approach for a polycrystalline SOF is demonstrated and the material properties after splicing are characterized. OCIS codes: (060.2290) Fibr
Pathways of Xenopus optic fibres regenerating from normal and compound eyes under various conditions.
We have used Horseradish peroxidase to investigate the pathways taken by Xenopus optic fibres regenerating from normal and electrophysiologically-confirmed compound eyes to the optic tectum. Optic fibres, when sectioned near the chiasma, regenerate up both sides of the diencephal
A suite of optical fibre sensors for structural condition monitoring
This paper is to review the research activities at City University London in the development of a range of fibre Bragg grating (FBG)-based sensors, including strain, temperature, relative humidity, vibration and acoustic sensors, with an aim to meet the increasing demands from in
Optical Fibre Communications Between Radio Telescopes in the European VLBI Network
The increase in availability of installed optical fibre within Europe is presenting a unique opportunity to upgrade the European Very Long Baseline Interferometry Network (EVN). This network of European radio observatories regularly take part in joint sessions to observe celestia
Stimulated Brillouin Scattering Characterization and Slow Light Generation Technique in Modern Optical Fibres
Stimulated Brillouin scattering (SBS) is a recent technique developed to generate slow light in optical fibres. It is the simplest and most applicable method of slow light production. In this paper a high power laser pump was used to provide the Brillouin gain of a low power sign
Photosensitivity in tin-doped silica optical fibres
Permanent gratings (refractive index modulation ~3x10 ) were written in tin-doped silica -4 optical fibres with low levels of SnO (~0.15 mol %). In Ge-doped silica, ~10 mol% GeO is 2 2 required to produce comparable photorefractivity under similar conditions. Photosensitivity in
Nonlinear optics: Fibre sources in the deep ultraviolet
Wavelength-tunable deep-ultraviolet (DUV; ~200–300 nm) and vacuum-ultraviolet (VUV; ~100–200 nm) lasers are needed in fields such as lithography1, medicine1 and spectroscopy2. However, many laser sources in this wavelength range, including excimerand ion-based DUV and VUV lasers,
Optically-controlled delays in optical fibres using Brillouin-generated slow and fast light
Recent experiments have demonstrated the possibility of optically changing the group velocity of an optical pulse as it travels through a material [1-4]. These experiments have shown that it is possible to slow the speed of light up to nearly stopping it [2] and also faster-than-