Patent ID: 7805042

Claim:
A flexible optical interconnection structure, comprising: a plurality of layers including an optical waveguide comprising a core and a clad, wherein the core is disposed to include a neutral surface that is not affected by expansion or contraction by bending, wherein the neutral surface is located at a position distant by a distance yn from an innermost surface when bent, the distance yn is expressed by a formula (1): y n = ∑ i = 1 n ⁢ E i ⁢ t i ⁢ y i ∑ i = 1 n ⁢ E i ⁢ t i ( 1 ) wherein a distance y i between a surface layer and a center of i-th layer (i is a natural number) in a thickness direction, an elastic modulus of the i-the layer is E i , and a thickness of the i-the layer is t i .