Specialty Optical Fibers Handbook

technology is, therefore, amenable to fabricating PM DCF and is the technology

of choice for reproducible and uniform volume production.

The PM ability of all PM fibers relies on residual stress anisotropy across the

core, which in turn arises from differences in thermal expansion coefficient

between the stress members, core and cladding. The composition, location, and

geometry of the stress members determine the birefringence in the fiber. In PM

DCFs, the core and cladding geometries are very different to standard telecom-

munications type of PM fibers; more specifically in LMA DCFs, the large

diameter of the core negatively affects the achievable ...