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EPSRC CDT in Next Generation Computational Modelling

Multimode optical parametric amplifiers and oscillators

Multimode optical parametric amplifiers Intro

This seminar was delivered by Ioannis Begleris (a NGCM Cohort 1 member), about Multimode Optical Parametric Amplifiers and Oscillators, which concerns his primary area of research. He is based in the Optoelectronics Research Centre within the University of Southampton.

The Internet is built on top of a growing network of optical fibre cables which span the world and there are millions of submarine fibres alone along the ocean floors. One of the primary problems is that current single-fibre technologies are not expected to be able to contest with ever-growing capacity needs.

The solution that Ioannis is working on involves transfering streamed data on multiple modes and wavelengths. His research has focused on exploring:

  • Four-wave Mixing (FWM). A high-intensity non-linear process where two or three waves situated at different wavelengths interact to create a separate wave at a separate frequency.
  • The Schrödinger Equation. A formula which models the pulse propagation throughout a fibre, including non-linear effects.
  • The Split-step Fourier Method (SFM), used to solve the Schrödinger Equation. Improvements to this method have been made to improve the performance by splitting the differentiation, now the Symmetrised Split-step Fourier Method (SSFM).
  • Case studies relating to Multimode Fibre Parametric Amplifiers.

Simulation of a passive multimode optical fibreSimulation of the peak intensity observed in a passive multimode optical fibre as a function of launched laser pulse duration and power.

Whilst there is lots of experimental data and case studies on this topic, more robust and accurate computational models could accelerate research in this field and develop ways of improving the existing fibre network (and saving money) rather than laying down new fibres.

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