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Single-mode fibres with low loss and a large transmission bandwidth are a key enabler for long-haul high-speed optical communication and form the backbone of our information-driven society. However, we are on the verge of reaching the fundamental limit of single-mode fibre transmission capacity. Therefore, a new means to increase the transmission capacity of optical fibre is essential to avoid a capacity crunch. Here, by employing few-mode multicore fibre, compact three-dimensional waveguide multiplexers and energy-efficient frequency-domain multiple-input multiple-output equalization, we demonstrate the viability of spatial multiplexing to reach a data rate of 5.1?Tbit?s?1?carrier?1 (net 4?Tbit?s?1?carrier?1) on a single wavelength over a single fibre. Furthermore, by combining this approach with wavelength division multiplexing with 50 wavelength carriers on a dense 50?GHz grid, a gross transmission throughput of 255?Tbit?s?1 (net 200?Tbit?s?1) over a 1?km fibre link is achieved. [ABSTRACT FROM AUTHOR]

The increasing amount of bandwidth requirements and quality of service needs for the next-generation access networks has boosted extensive research in the fiber-optics communication field. In this light, passive optical networks (PONs) combined with optical code division multiple access (OCDMA), provide a potentially cost-effective solution to meet such bandwidth demands. This work proposes an optical transparent architecture which enables all-optical communication between the network nodes. The encoded data streams are multiplexed at a merging point which results in multiple user interference (MUI), thus significantly reducing the network throughput. The networking nodes are able to monitor and record user activity in the PON, and further register the (past) state of activity at the merging point. In this work, we study the coherence of state between the networking nodes and the merging point, for different packet size distributions, in order to predict an optimal transmission instant of each node's data packets. We note that the states are coherent depending on the packet size distribution. [ABSTRACT FROM AUTHOR]

Optical receivers used in WDM networks are often precedeed by an optical amplifier to ensure good receiver sensitivity. In this letter, we present an experimental investigation of homowavelength crosstalk in optically preamplified systems using an IM/DD transmission scheme. As a light source, a DFB laser is modulated either directly or externally by an electrical generator. Performance comparisons for both modulation schemes are given to show the influences of noise contribution of amplified spontaneous emission (ASE) noise. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 225–229, 1999. [ABSTRACT FROM AUTHOR]

We report on a 2.5 Gbit/s transmission experiment at 645 nm wavelength using a PMMA–GI–POF with a core diameter of 500 μm reaching a record distance of 200 m. The result is obtained owing to the use of a very sensitive silicon APD receiver, a laser source with a narrow spectral width, a fiber with improved performance, and low-loss optical interconnection between the components. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 163–166, 1999. [ABSTRACT FROM AUTHOR]

1310 to 1550 nm transmultiplexing based on nonlinear polarisation rotation in a single semiconductor optical amplifier is proposed. Error- free 2 × 5 Gbit/s 1310 nm to 10 Gbit/s 1550 nm transmultiplexing is demonstrated. [ABSTRACT FROM AUTHOR]