Fiber with asymmetrical core and method for manufacturing same

摘要

An optical active fiber is configured with an asymmetrically-shaped core having at least one long axis and a shortest axis which extends transversely to the long axis. The outmost cladding of the active fiber is configured with a marking indicating the orientation of the short axis. The marking allows for bending the fiber so that the shortest axis extends along and lies in the plane of the bend thereby minimizing distortion of a mode which is guided by the asymmetrically-shaped core as light propagates along the bend.

主权项

1. A fiber laser system comprising at least one fiber gain block provided with:
input and output passive fibers having respective spaced ends facing one another; a coreless pump light delivery fiber guiding a pump light; and an optical active fiber extending in a side-by-side configuration with and receiving the pump light from the delivery fiber, the active fiber having:
opposite ends which are butt-spliced to respective spaced ends of the input and output passive fibers, respectively,at least one stretch of an asymmetrically-shaped multimode (MM) core with at least one long axis and a shortest axis extending transversely to the long axis, the asymmetrically-shaped core being configured to support substantially a fundamental transverse mode or very few transverse modes at a desired wavelength, and an outmost cladding surrounding the core and having a marking which indicates the orientation of the short axis,wherein the input and output passive fibers each are configured with an asymmetrically-shaped core structured substantially identically to the asymmetrically-shaped core of the active fiber so that signal light propagating at the desired wavelength through the butt-spliced ends has minimal losses.