METHOD FOR OPTICAL WAVEGUIDE FABRICATION

A method for producing an optical waveguide by: (a) depositing a first composition: (i) a polysiloxane comprising epoxy and alkenyl groups with refractive index no greater than 1.50, (ii) a compound comprising at least one epoxy group and refractive index no greater than 1.49, and (iii) a polysiloxane having refractive index at least 1.50; (iv) a photo acid generator; (v) a hydrosilylation catalyst, (vi) an inhibitor for hydrosilylation; (b) curing by exposure to ultraviolet light; (c) removing the uncured portion to produce a patterned core layer; (d) after a time from 20 to 300 hours depositing a second composition comprising: (i) a polysiloxane comprising epoxy groups with refractive index no greater than 1.49, and (ii) a compound comprising at least two epoxy groups with a refractive index no greater than 1.49 and an alcohol having refractive index no more than 1.45 (iii) at least one photo acid generator. 一种用于通过以下步骤生产光波导的方法：(a)沉积第一组合物：(i)包含环氧基和烯基的折射率不大于1.50的聚硅氧烷，(ii)包含至少一个环氧基并且折射率不大于1.49的化合物，和(iii)具有至少1.