Abstract
Optical fibre cables for telecommunications now rely upon HE11 transmission as the basic mode. This is a 'hybrid' wave and as such has certain disadvantages compared with a 'pure' mode. Some of the larger fibres employ multi-mode operation and this tends to accentuate problems with auxiliary equipment. A form of optical fibre is suggested for the support of a coaxial TE01 mode and, as a 'pure' wave in a fibre of comparatively large diameter, it could offer some attractive features for future development. Requirements for launching and transmission of this TE01 mode by itself, on a suitable optical fibre, are discussed.
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