GAIN-PRODUCING FIBERS WITH INCREASED CLADDING ABSORPTION WHILE MAINTAINING SINGLE-MODE OPERATION

摘要

PROBLEM TO BE SOLVED: To provide GPFs designed for increased cladding absorption of pump light while maintaining the operation in a single signal mode.SOLUTION: The cladding absorption in a single-mode of gain-producing fibers is increased in fiber designs that includes a trench region disposed between a core region and an inner cladding region. The increased cladding absorption is achieved while maintaining the single-mode operation.SELECTED DRAWING: Figure 1