Abstract: A method for fabricating an optical waveguide comprises: providing a sample of lithium niobate doped with magnesium oxide and having at least one grating of periodic domain inversion defined therein; applying a layer of metallic zinc to a surface of the sample over the at least one grating using sputter deposition; heating the sample in an atmosphere of pure oxygen to cause the zinc to indiffuse into the lithium niobate to form a waveguiding layer of increased refractive index under the surface of the sample; and using a dicing blade to cut two substantially parallel channels along a length direction of the at least one grating, to define a ridge waveguide between the two channels.

Abstract: A method of forming an optical fibre assembly, comprises providing a planar substrate made of a first material; positioning an optical fibre with an outer layer of a first glass material on a surface of the substrate to form a pre-assembly; depositing a further glass material such as silica soot onto the pre-assembly, over at least a part of the optical fibre and adjacent parts of the substrate surface; and heating the pre-assembly to consolidate the further glass material into an amorphous volume in contact with at least parts of the surface of the substrate and the outer layer of the optical fibre, thereby bonding the optical fibre to the substrate to create the optical fibre assembly.

Abstract: A method of forming an optical fibre assembly, comprises providing a planar substrate made of a first material; positioning an optical fibre with an outer layer of a first glass material on a surface of the substrate to form a pre-assembly; depositing a further glass material such as silica soot onto the pre-assembly, over at least a part of the optical fibre and adjacent parts of the substrate surface; and heating the pre-assembly to consolidate the further glass material into an amorphous volume in contact with at least parts of the surface of the substrate and the outer layer of the optical fibre, thereby bonding the optical fibre to the substrate to create the optical fibre assembly.