Laser-Drawn Silicon Core Fibres for Raman Amplification and Wavelength Conversion

Raman scattering is a nonlinear process that can be used to generate or amplify optical signals in wavelength regions where traditional light sources are limited or unavailable. Thus, when constructed from high-power lasers coupled to waveguides with broad transmission windows, Raman scattering can be used to extend the wavelength coverage of existing laser systems [1]. In this regard, silicon core fibres (SCFs) are a promising platform for Raman shifting processes due to their high damage threshold, strong Raman response and extended infrared transmission <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(1.1 \sim 7 \mu \mathrm{m})$</tex>. Moreover, as they are clad in silica, the SCFs are stable, and compatible with other glass fibre components, such as the pump laser, opening a route for the development of robust all-fibre systems [2].