An optical waveguide structure has lines (2), crossings (3), and
branchings (4). In the area of the branchings (4), the waveguide
structure consists of planar waveguides made of a waveguide material that is put
into troughs (7) formed into a substrate (8). The waveguide material
has a higher refractive index than the material delimiting the troughs (7).
In the area of said crossing (3) the waveguide structure consists of fibers
(5) which cross in the area of the crossings.
