OPTICAL SWITCH

摘要

PROBLEM TO BE SOLVED: To provide an optical switch having excellent manufacturability and reliability. SOLUTION: An upper substrate is constituted to contain an alkaline ion compound (such as a lithium oxide) and the content of the alkaline ion compound is specified to 1 to 20%. Or an insulative thin film containing the alkaline ion compound (such as the lithium oxide) is formed on a joint surface of the upper substrate with an optical waveguide substrate or a joint surface of the optical waveguide substrate with the upper substrate and the content of the alkaline ion compound is specified to 1 to 20%. The thickness of the insulative thin film is specified to 0.1 to 10μm. Also, the conductive thin film is formed on the surface facing the joint surface of the upper substrate with the optical waveguide or on the surface facing the joint surface of the optical waveguide with the upper substrate. Or the conductive thin film is formed on a boundary facing the joint surface of the insulative thin film form on the upper substrate with the optical waveguide substrate or the boundary facing the joint surface of the insulative thin film formed on the optical waveguide substrate with the upper substrate.