Higher-order mode fiber optics T-coupler

A higher order mode fiber optic T-coupler being comprised of a single main optical fiber having first and second ends and a predetermined axis, said first end receiving a first input optical light signal for transmission toward said second end, said single main optical fiber having exclusively an air gap therein, said gap being defined by a first and second separated endfaces in said single main optical fiber, and a first multiplicity of exclusively single fiber optical channels positioned at said second endface of said gap, each of said single optical channels being at a different angle to said single main optical fiber, each of said angular optical channels consisting of a single optical fiber, the variation of distance of said gap and the adjustment of said angle determining the degree of coupling of said higher modes into said optical channels.