Technique for producing polarization-preserving and single polarization optical fibers.

Each of polarizing elements is adapted to render a unique polarization to the light signals emitted by a respectively corresponding one of the modules.

A polarization preserving optical fiber and an absolute single polarization optical fiber capable of transmission over a long distance with the polarization condition of a signal light kept preserved.

Standard drawing techniques may then be utilized to form polarization-preserving fibers and single polarization fibers from the preform (20).

A method and apparatus for generating single polarization fiber laser output are disclosed.

Thus, all of the light, which passed across all the layers practically without losses, has a single polarization.