A flexible optical waveguide film comprises: two waveguide cores; and a clad surrounding the two waveguide core, wherein a light entrance/exit part is disposed at one end of each of the two waveguide cores, the waveguide film having an optical path converting part comprising an air void located inside...http://www.google.com.au/patents/US7646948?utm_source=gb-gplus-sharePatent US7646948 - Flexible optical waveguide film, optical transceiver module, multi-channel optical transceiver module, and method of manufacturing flexible optical waveguide film
