| 摘要 |
PURPOSE:To shorten the time required for specular finishing of optical waveguide connection end surfaces and to reduce connection loss by forming a protection film, which is smaller in refractive index than optical waveguides, approximates in mechanical performance to a dielectric crystal substrate and is in close control with the dielectric crystal substrate, on the dielectric crystal substate nearby the connection end surfaces of the optical waveguides. CONSTITUTION:The protection film 17 is smaller in refractive indes than the optical waveguides 12 and 13 and similar in mechanical performance to the dielectric crystal substrate and formed in close contact with the dielectric crystal substrate. The protection film 17 is formed on the dielectric crystal substrate 11 nearby the connection end surfaces of the optical waveguides 12 and 13 to a thickness of about several microns and the substrate 11 and protection film 17 are formed in close contact without any inclusion. Consequently, the protection film 17 never peels at the time of a disconnection. Further, the substrate 11 and protection film 17 are similar in hardness as the mechanical performance, so the substrate 11 and protection film 17 form a body which is almost elastically continuous. Therefore, chipping is caused on the protection film 17 at the end part of a cut surface and no large chipping of micron order occurs to the connection end surface part of the optical waveguides 12 and 13. Consequently, the time required for the specular working is shortened and the connection loss is reducible. |
