Abstract

Optical glass fibers with a very large numerical aperture (NA) of 0.56 and a loss of 8.6 dB km −1 have been fabricated by the double-crucible technique using multicomponent glasses. A large numerical aperture (NA) of over 0.5 brings about effective light couplings with conventional LED sources, and a relatively low loss of less than 10 dB km −1 easily extends the span of optical transmission systems such as data transmission, remote sensing, telemetering, etc. to more than 1 km. Optical transmission properties of the fibers including spectrum losses, scattering losses, coupling losses and connection losses are reported.

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