Patent ID: 6775449
Filing Date: 2004-08-10
Classification: B29C,B29D,B29L,G02B

Abstract:
An optical waveguide comprising a multi-mode optical fiber for propagating in high order modes and low order modes therethrough, wherein independent propagating between different order modes causes degrading of the signal propagating therethrough, said optical fiber having a core region having a first index of refraction and a cladding region having a second index of refraction different from said first index surrounding said core region, a portion of the high order modes being propagated in the peripheral region of said waveguide and the propagation region of the low order mode being concentrated in the central region of the core;a plurality of particles having a third index of refraction different from said first and indices disposed within said waveguide for inducing mode coupling or differential mode attenuation in the signal energy by differentially altering the propagation of selected modes, said particles having a density distribution within said waveguide that is greatest in the propagation region of the modes to be principally affected by said particles.