Single-Mode Core-Diffused Tapers For Interconnection Components

Abstract

A novel method of producing tapers in single -mode fibres by controlled thermal diffusion of the dopant has been developed. Extended biconic tapers have been produced, which have shown a radically improved tolerance to transverse and longitudinal offsets. Mechanical fibre dimensions are maintained during the process. The tapers are appropriate for connection devices, where the improved tolerance to transverse offset will reduce insertion losses or enable the use of cheaper, less accurately machined components. Where free space propagation of light between two fibres is required, the improved tolerance to longitudinal offset removes the need for beam collimation elements. Thin bulk optical devices may be advantageously introduced into the gap. Furthermore, low cost alignment components may be used in the assembly.