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AssigneeNippon Telegraph and Telephone Corporation
InventorsKatsuhiko Hirabayashi, Satomi Katayose, Yuji Fujiwara, Ryoichi Kasahara
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An end portion structure of a transmission line of the present invention is a structure in which a protective film with a thickness of 0.5 μm to 3.0 μm is formed on the end surface of the transmission line in place of an end cap formed in an end portion of a transmission line in the related art, and no adhesive is used in a portion through which light passes. The protective film on the end surface works to suppress a bulge of the core. The thickness of the protective film is significantly thinner than the end cap, and thus waveguides facing each other can be brought close to each other. It is possible to reduce the connection loss between two fibers or waveguides facing each other to be 0.5 dB or less. Since no adhesive is used, there is no loss increase caused by adhesive deterioration.
An end portion structure of a transmission line configured to pass through light having a wavelength from a visible light region to an ultraviolet region, the end portion structure of the transmission line being connected with no adhesive located at a portion configured to pass through the light, the end portion structure comprising:
Dependencies are inferred from the claim text.