This book is a collection of contributions by renowned scientists in the optical fibre technology field, covering a wide range of recent progress pertaining to various topics such as special optical fibres, non-linear effects in optical fibre, components and devices for communication systems as well as optical fibre sensors. Inevitably, many aspects are omitted but each chapter is a representative example of the latest trends and results in a rapidly evolving research scenario. This collection is enriched by a few expert commentaries on selected topics, highlighting recent innovative developments and a future outlook in optical fibre technology.