HDI fabrication techniques are employed to form a variety of optical waveguide structures in polymer materials. Adaptive optical connections are formed, taking into account the actual position and orientation of devices which may deviate from the ideal. Structures include solid light-conducting...http://www.google.com.tw/patents/US5737458?utm_source=gb-gplus-share專利 US5737458 - Optical light pipe and microwave waveguide interconnects in multichip modules formed using adaptive lithography 
