Method Of Making An Optical Fiber With Trench Region In Its Index Profile

Abstract

An optical fiber that is relatively insensitive to bend loss and alleviates the problem of catastrophic bend loss configured to support and guide the propagation of light in a fundamental transverse mode. The cladding region includes an outer cladding region, a pedestal region, an inner trench region, and an outer trench region. The pedestal region and the outer cladding region each have a refractive index relatively close to that of the outer cladding region. To suppress HOMs the pedestal region is configured to resonantly couple at least one (unwanted) transverse mode of the core region (other than the fundamental mode) to at least one transverse mode of the pedestal region. Also described are multi-tube fabrication techniques for making such fibers as well as single-pass/double-pass fabrication techniques for making the trench regions of such fibers.

Dependencies are inferred from the claim text.