Low-loss single polarisation fibres with asymmetrical strain birefringence

Low-loss and highly birefringent single polarisation fibres have been fabricated. The minimum transmission loss and the modal birefringence of the fibre with refractive-index difference ?=0.61% was 0.62 dB/km at ?=1.52 ?m and 8.5×10?5 at ?=1.15 ?m, respectively. The state of linear polarisation was stable against the handling conditions such as bending, twists, concentrated force, and temperature variations.