A first clad layer is formed on a smooth support substrate via a release layer. On the first clad layer, a core through which light propagates and alignment marks are simultaneously formed. Further, these layers are covered with a second clad to obtain an optical wiring layer. Then, the optical wiring...http://www.google.se/patents/US6438281?utm_source=gb-gplus-sharePatent US6438281 - Optical wiring layer, optoelectric wiring substrate, mounted substrate, and methods for manufacturing the same
