Fibercore Limited HiBi is a singlemode, polarisation-preserving optical fibre designed for high-performance interferometric and polarimetric sensors, integrated optics and coherent communications. The characteristic 'Bow-Tie' stress-applying parts, or 'SAPs' act like opposing wedges to generate the optimum stress distribution within the fibre. This unique and patented design gives you the very best in both performance and handling - maximum birefringence, with minimum stress-breakout when cleaved, connectorised or polished.