Ultra-high-density spatial division multiplexing with a few-mode multicore fibre.

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]