Abstract

It has "been usual, when launching light into a circular cladded glass fibre and recovering the signal at the output from the fibre, to rely on direct coupling through the cleaved or polished ends of the fibre. Such a coupling arrangement has drawbacks when trying to connect an optical thin film or rectangular guide to a circular fibre, because the apertures of the two guiding systems are not matched. However, some method have recently been published ^1,2 for suitably directing the radiation from the cut end of a fibre into a thin-film guide.

© 1975 Optical Society of America