iXblue Photonics has released a highly birefringent polarisation fibre targeting high-volume production of compact fibre-optic gyroscope operating at 1550 nm. iXblue says the fibre, based on 30 years’ experience in Polarisation Maintaining Gyro fibre, features the highest birefringence, and shortest beath length available in the industry – 0.9 mm at 633 nm. Thus, it offers high Polarisation Extinction Ration for fibre-optic gyro coils, even with extremely small radius (below 30 mm). The company says this record birefringence has no impact on the other key optical specifications as attenuation, mode field diameter and numerical aperture remain the same to ensure low loss and excellent coupling under bent configuration.
“Thanks to our Tiger type fibre – also called elliptical clad – we have been able to work on the material composition of the clad in order to increase the birefringence stress and maintain a perfect round shape for the core,” explains Thomas Villedieu, product manager at iXblue Photonics. “With other technics, you do not get such level of flexibility. For instance, with Panda type fibres you are quickly limited by the size of the stress rods and Bow-Tie type leads to severe deformation of the core. We also worked on the clad shape in order to get good recognition by standard PM splicing equipment, the spliceability with standard PM panda fibre is excellent which is a key point for seamless integration at our customers manufacturing floor”.
iXblue says This new “IB” fibre opens new possibilities for FOG manufacturers as they are now able to manufacture tiny coils while keeping a good PER over operational temperature range. The external coating diameter is reduced to a remarkable 128 µm value for an 80 µm clad fibre, helping further to reduce the outside size of coils and limiting the Shupe effect.
“With FOG technology spreading to all different fields, boosted by the autonomous navigation market across all type of environments (land, air and sea) the need for smaller and smaller gyros is increasing. We are very pleased to introduce this fibre that should become a new reference for compact gyros. Initial customers’ feedbacks are enthusiastic, as they report an increase by more than 5 dB of the PER of their systems,” comments Nicephore Nicolas, business development manager for iXblue Photonics fibre division.
The company says the fibre is in stock and ready for shipping (product reference is IXF-PMG-IB-1550), and can be customised to meet specific customer needs.
For more information, visit www.ixblue.com