HiBi is a singlemode, polarization-maintaining optical fiber 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 fiber. This time-proven design gives the very best in both performance and handling maximum birefringence, maximum performance with minimum stress-breakout when cleaved, connectorised or polished.