To provide a coupling structure which suppresses the deterioration in the propagation characteristic of light of optical waveguides in the coupling structure for the optical waveguides and optical fibers using dolly plates.
The dolly plates 22 and 30 are fixed onto both ends of an LiNbO3 substrate 11 formed with the Ti-diffused optical waveguide 13. The recessed part 24 of the dolly plate 22 is disposed on the optical waveguides 16 and 17 and the recessed part 34 of the dolly plate 30 is disposed on the optical waveguide 15 to prevent the direct contact of the bases of the dolly plates 22 and 30 with the optical waveguides 15, 16, 17. The dolly plate 22 reinforces the joining of the LiNbO3 substrate 11, a ceramic substrate 62 holding the bare optical fiber 70 and a quartz cap 64. The dolly plate 30 plays the role of joining of the LiNbO3 substrate 11, a ceramic substrate 82 holding the bare optical fiber 90 and a quartz cap 84.
HAMASHIMA AKIRA
OSUGI YUKIHISA
