Optical Components for Space Division Multiplexed Transmission (SDM).

Lead Research Organisation: University of Southampton
Department Name: Optoelectronics Research Centre


The PhD will look into several important optical components required for a telecommunication network and researching how to create these components for varying SDM fibre types.

This reviews the current progress made during the first eight months of the PhD. It first reviews the different SDM fibre types and SDM components, along with the current research progress. After which, the creation and experimental results of both a single-mode and two-mode fibre isolator are explored, with the former showing a good isolation of 46.86 dB with an insertion loss of 0.34 dB, but the latter showing signs
of mode dependent loss (_ 2:5 dB) and high crosstalk between the modes. The device performance is very sensitive to the alignment of two-mode fjbre isolator assembly and so further practice is required to achieve better results. A two-mode fibre Variable Optical Attenuator (VOA) is also created with the attenuation between the two modes slightly different due to the different mode field diameters. Finally, the current and future plan for the PhD is shown.


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Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/N509747/1 01/10/2016 30/09/2021
1921221 Studentship EP/N509747/1 29/09/2016 31/03/2020 Andrew Wood
Description I have fabricated a 3 dB beam splitter for both few mode fibres (FMFs) and multicore fibres (MCFs) - the first of their kind created for space division multiplexed (SDM) transmission. These are passive optical devices that split light 50/50 from one input fibre to two output fibres, where the fibre types used in this case can be used in SDM networks.

In addition, a lot of work has been done using digital micromirror devices (DMDs) - a device that has over a million individually addressable mirrors. With this device, work has been done to use it to create variable optical attenuators (VOAs) for both few mode fibre and multicore fibres. In addition, it can be used to actively scan the profiles of the ends of different fibres to see characteristics like the shape of the mode and crosstalk between the cores.
Exploitation Route Passive beam splitters are devices that are widely used in current telecommunication networks. Therefore, this device offers a way for beam splitting to be achieved in SDM telecommunication networks. Furthermore, the fabrication method used can be expanded for different splitter/coupler types. In addition, the work with DMDs can also be greatly expanded upon for use within SDM telecommunication networks.
Sectors Digital/Communication/Information Technologies (including Software)