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Strain birefringence in single-polarisation germanosilicate optical fibres

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4 Author(s)
Kaminow, I.P. ; Bell Laboratories, Crawford Hill Laboratory, Holmdel, USA ; Simpson, J.R. ; Presby, H.M. ; MacChesney, J.B.

Fibres that maintain a fundamental mode with fixed polarisation can be realised by the introduction of a large strain birefringence. A modal birefringence of 3 × 10¿4 was achieved by differential thermal expansion in a germanosilicate fibre prepared from a circular preform by the exposed-cladding technique. Measurements of birefringence agree with earlier calculations.

Published in:

Electronics Letters  (Volume:15 ,  Issue: 21 )