Optical fiber spatial mode converter using periodic core deformation
AssigneeAT&T Corp.
InventorsCraig D. Poole, Herman M. Presby
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Abstract
Efficient conversion between the LP.sub.01 and the LP.sub.11 modes in a two-mode optical fiber is realized in a fiber grating fabricated by forming a series of longitudinally-spaced cuts in the fiber cladding, and then annealing the fiber in the region of the cuts. The latter step uses the surface tension of the molten glass to transform the corrugation on the cladding into a sinusoidal deformation of the fiber core.
Claims8
A method for introducing a periodic deformation along the core of an optical fiber having a core region surrounded by a cladding comprising the steps of:
- making cuts in said cladding at longitudinally spaced intervals;
- and annealing said fiber in the regions of said cuts.
A method for :fabricating a mode converter in an optical fiber having an inner core surrounded by an outer cladding comprising the steps of:
- making cuts in said cladding at longitudinally spaced intervals .lambda..sub.b ;
- and annealing said fiber in the regions of said cuts thereby permanently deforming said core.
Dependencies are inferred from the claim text.