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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.
Inspec keywords: optical communication equipment; diffraction gratings; optical filters; fibre optics
Other keywords:
Subjects: Optical communication devices, equipment and systems; Fibre optics; Other fibre optical devices and techniques; Optical communication; Optical coatings and filters; Gratings, echelles; Spectral and other filters