| 摘要 |
An optical waveguide is produced by using a polymer obtained by using a silsesquioxane derivative represented by the formula (1-0). In the formula (1-0), R<SUP>0 </SUP>independently represents hydrogen, alkyl having 1 to 40 carbon atoms in which optional hydrogen may be replaced by fluorine and optional -CH<SUB>2</SUB>- may optionally be replaced by -O-, -CH-CH-, cycloalkylene, or cycloalkenylene, aryl in which optional hydrogen may optionally be replaced by halogen, or with alkyl having 1 to 20 carbon atoms whereby optional hydrogen may be replaced by fluorine and optional -CH<SUB>2</SUB>- may be replaced by -O-, -CH-CH-, cycloalkylene, or phenylene, or arylalkyl in which optional hydrogen in the aryl may be replaced by halogen or alkyl having 1 to 20 carbon atoms, and hydrogen in the alkylene of the arylalkyl may be replaced by fluorine, and optional -CH<SUB>2</SUB>- in the alkylene of the arylalkyl may be replaced by -O-, -CH-CH-, or cycloalkylene, and Y is a group represented by the formula (a) or (b):
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