Dual-band bend tolerant optical waveguide

The present invention is a refractive index nco And radius rcoWith the core; Surrounding the core in a lateral direction, the refractive index nic And ricInner cladding having an outer radius; Surrounding the inner cladding in the lateral direction, the refractive index nocExternal cladding having; Pressed well and includes a narrow di and nco> noc> nicIt relates to the optical waveguide element. The core radius (Rco) On the inside, di-Pressed-well clad radius (ricThe range of the ratio of) varies from 3.0 to 2.4, + Δ is 0.0014 to 0.0021, -Δ is -0.0021 to -0.0034, and ΔTotIt is 0.0043 to 0.0049.An optical waveguide element, the refractive index, the inner cladding, the outer cladding, the core