Modern optical networking techniques have the potential to greatly extend the applicability of quantum communications by moving beyond simple point-to-point optical links, and by leveraging existing fibre infrastructures. We experimentally demonstrate many of the fundamental capabilities that are required. These include optical-layer multiplexing, switching, and routing of quantum signals; quan...

With interest in the potential of optical fibres as the basis of next-generation thermoluminescence dosimeters (TLDs), the development of suitable forms of material and their fabrication has become a fast-growing endeavour. Present study focuses on three types of Ge-doped optical fibres with different structural arrangements and/or shapes, namely conventional cylindrical fibre, capillary fibre,...

Fibre Raman amplifiers are being deployed in many new long-haul and ultra long-haul fibre-optic transmission systems, making them the first and most widely commercialized nonlinear optical devices in telecommunications. One of the main reasons for this is their improved noise figure and reduced nonlinear penalty of fibre systems hence allowing for longer amplifier spans. In this paper, we have ...

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 celestial radio sources at high resolution, using sophisticated magnetic tape equipment to record data at rates up to 1 Gbit/...

We derive pulse propagation equation for a graphene-clad optical fibre, treating optical response of graphene and nonlinearity of the dielectric fibre core as perturbations in asymptotic expansion of Maxwell equations. We analyse the effective nonlinear and attenuation coefficients due to the graphene layer. Based on the recent experimental measurements of the nonlinear graphene conductivity, w...

Unlike conventional Polymer Optical Fibre (POF), single -mode Microstructured Polymer Optical Fibre (MPOF) can easily be fabricated, as required for many nonlinear applications. It was demonstrated that tungsten electrodes for poling and measuring the electro -optic coefficient could be incorporated in the PMMA fibre during the draw process. Lengths of up to 70m of this fibre were produced. For...

Propagation time through an optical fibre changes with the environment, e.g., a change in temperature alters the fibre length and its refractive index. These changes have negligible impact in many key fibre applications, e.g., telecommunications, however, they can be detrimental in many others. Examples are fibre-based interferometry (e.g., for precise measurement and sensing) and fibre-based t...

This paper presents a review of the latest research and development in the field of fibre optic communication system. Remarkable developments can be seen in the field of optical fibre communication in the last decade. Wide-bandwidth signal transmission with low latency is emerging as a key requirement in a number of applications, including the development of future exaflopscale supercomputers, ...

Digitized-Radio over Fibre (DRoF) techniques provide higher dynamic range and are more robust against optical link impairments. In this paper, a fully-photonic DRoF system is proposed and its performance is investigated in an integrated system with an analogue Radio over Fibre (ARoF) system. In this simulation based evaluation, DRoF and ARoF systems performance in the presence of other channels...

In this paper, a fibre laser at 546 nm has been studied for a signal power of -30 dB. Er-doped ZBLAN fibre has been used by upconversion pumping of a 980 nm laser diode. Gain saturation effect has been investigated in detail. Laser performance has also been discussed. An efficiency of 35% has been calculated with a length of 5 mm fibre laser. Results show that Er-doped ZBLAN is a promising cand...