Abstract

In single-mode fiber sensors, preservation of linear polarization is often desirable and sometimes essential. Several different types of polarization- preserving fiber are now available which are produced by a variety of techniques. These fibers have high birefringence, low loss, and excellent polarization holding. Fibers for sensor applications should emphasize design characteristics that are different from those of communications fibers. Special designs are now becoming available that reduce the loss from small radius bends, have smaller outside diameters, and utilize special coatings. High-birefringence fibers are leading to a whole set of in-line fiber components which are either made using the fiber or are produced directly in the fiber itself. These in-line components are replacing the conventional bulk optical components allowing reduction of size and often increased performance and stability.

© 1985 Optical Society of America