Coherent Optical Signals

This group is led by Dr Radan Slavik and it is part of the Advanced Fibre Technologies & Applications Group led by Prof David J Richardson.

Group webpage

Advanced Fibre Technologies & Application Group webpage

PhD Projects:

Photonics-assisted generation of ultrapure high-bandwidth signals

Supervisor: Dr Radan Slavik 
Co-supervisor: Prof D J Richardson

Generation and processing of radiofrequency (RF) signals or data sent through Internet fibre optic requires their conversion from analogue to digital form and vice versa. Traditionally, electronics is used for these tasks, but it has its inherent limitations. These limitations could be overcome replacing some critical electronic components with optical ones. In practice, it is more advantageous to completely re-work the entire architecture.

This projects aims to investigate new architectures of photonics-aided RF signal digital-to-analogue conversion with the highest achievable fidelity and bandwidth. It will follow up on our work in which we in collaboration with our industrial partner EW Simulation Technology - invented a new architecture that we are currently building and testing.

The project would suit applicant with an interest in photonics, photonics signals and components, and their precise control.

The project will be done in tight collaboration with our industrial partner, EW Simulations Technology that is based in Farnborough.


Exploring the potential of optical fibres with low propagation delay sensitivity

Supervisor: Dr Radan Slavik
Co-supervisors: F. Poletti and M.N. Petrovich

A signal propagating through an optical fibre is generally considered to be immune to the external environment and associated disturbances. However, this is only true in terms of the signal intensity (power) the time signal needs to propagate through the fibre depends on environmental perturbations like temperature variations that induce changes in the fibre refractive index and length. This sensitivity is critical for many fibre systems, for example when used in interferometry or for ultra-precise time/frequency transfer applications. There are several emerging new types of fibres that present significantly lower sensitivity to those used today. Recently, we demonstrated an optical fibre with its sensitivity to temperature fully eliminated.

This project is concerned with the development of new devices that would greatly benefit from these new fibres. Two different fibres will be investigated: (a) based on a specialty-coated fibre and (b) on hollow-core photonic bandgap fibres. The project is expected to include both theoretical and experimental work including modelling of devices of interest, the building of these devices and the subsequent precise characterization of their performance using advanced methods for optical phase characterization.

The project will also involve collaborative work with National Physical Laboratory in London.


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