Efficient mode conversion in telecommunication fibre using externally written gratings

TLDR

The study introduces a novel method for writing gratings in optical fibres. The technique writes gratings point‑by‑point on the fibre side with a UV laser, setting the conversion wavelength by grating periodicity and enabling coupling at any desired wavelength. Efficient mode conversion between forward propagating modes is achieved.

Abstract

A novel approach to grating writing in optical fibres is described. This method involves writing the grating point by point through the side of the fibre using a UV laser source. Efficient mode conversion between forward propagating modes is demonstrated. The wavelength at which conversion occurs is determined by the periodicity of the grating. The grating can be designed to couple light at any wavelength of interest.