Future Internet should be able to support a wide range of services containing large amount of multimedia over different network types at a high speed. The future optical networks will therefore be hybrid, composed of different single-mode fibre (SMF), multi-mode fibre (MMF) and free-space optical (FSO) links. In these networks, novel modulation and coding techniques are needed that are capable ...

core were investigated. It was shown from the measurement that the beat length was about L = 23 mm (birefringence B = 5 x 10") and the state of linear polarisation of the incident light beam was maintained up to 0-6 kg/cm of the concentrated force when the incident plane of polarisation was coincident with the major axis of the fibre. It was also shown that the degree and the plane of polarisat...

The optical fibre laser Doppler velocimetry (LDV) is a technique used for the velocity measurement of fluid flows. The two-dimensional directional LDV using a special technique based on generation of heterodyne signals of differential carrier frequencies has been described in literature [1,2]. The capability of simultaneous measurement of three orthogonal velocity components has also been prese...

-In this paper the origins of crosstalk in DWDM millimetre hybrid fibre radio networks are discussed. A means by which polarisation interleaving might be implemented with a view to reducing the impact of crosstalk is explained analytically. It is concluded that with standard fibre and continuous wave transmission polarisation interleaving provides little benefit if used over distances greater t...

An air-core holey fibre design that supports a single-polarisation circularly symmetric mode is presented. The mechanism that isolates the single polarisation, the advantages of the design and fabrication efforts to date will be discussed.

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/...

Optical fibre underpins the global communications infrastructure and has experienced an astonishing evolution over the past four decades, with current commercial systems transmitting data rates in excess of 10 Tb/s over a single fibre core. The continuation of this dramatic growth in throughput has become constrained due to a power dependent nonlinear distortion arising from a phenomenon known ...

Introduction: Orthogonal-frequency-division-multiplexing (OFDM) is a special form of multicarrier modulation where a single data stream is transmitted over a number of lower rate orthogonal subcarriers [1]. Such a format has been widely implemented in various digital communication standards. Recently we proposed an equivalent optical multicarrier modulation format, called coherent optical OFDM ...

8 DAVIS, D.D.. GAYLORD, T.K., GLYTSIS, E.N., KOSINSKI, S.G., MEITLER, s.c., and VENGSARKER, A.M.: ‘Long-period fibre grating fabrication with focused CO2 laser pulses’, Electron. Lett., 1998, 34, pp. 302-303 DAVIS, D.D.. GAYLORD, T.K., GLYTSIS, E.N., and METTLER, s.c.: ‘CO, laser-induced long-period fibre gratings: spectral characteristics, cladding modes and polarisation independence’, Electro...