The optical path difference between by-pass connection and cross connection in a cross-over plannar integrated optical system is minimized by using two optical substrates having different refractive ratio. The upper optical substrate and the lower optical substrate have different refractive ratio so that the optical path difference is compensated by the lower optical substrate.
申请公布号
KR940006345(B1)
申请公布日期
1994.07.18
申请号
KR19920011455
申请日期
1992.06.29
申请人
KOREA ELECTRONICS & TELECOMMUNICATIONS RESEARCH INSTITUTE