University of Southampton

Mubassira B Syed Nawazuddin

Francesco Poletti

Gregory Teofil Jasion

John Richard Hayes

Natalie Wheeler

Thomas David Bradley

A preform () for an antiresonant hollow core optical fibre comprises an outer jacket tube () having an inner surface and a central longitudinal axis (); a plurality of antiresonant cladding tubes () spaced apart at predefined peripheral locations around the inner surface of the outer jacket tube (), each antiresonant cladding tube () in contact with the inner surface such that a central longitudinal axis () of each antiresonant cladding tube () is at a first radial distance from the central longitudinal axis () of the outer jacket tube (); and a plurality of spacing elements () disposed alternately with the antiresonant cladding tubes () and each in contact with an outer surface of each of two adjacent antiresonant cladding tubes () at one or more contact points (), the contact points () at a second radial distance from the central longitudinal axis () of the outer jacket tube (), the second radial distance being greater than the first radial distance.

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Southampton, United Kingdom

Mubassira B Syed Nawazuddin