“…Such new optical waveguides could be deposited onto transparent paper or foils and may have unique properties such us high transparency, low optical loss, suitable temperature stability and excellent flexibility/bendability. Also polymer materials for fabrication of flexible planar optical waveguides appeared to be a good choice for their excellent optical properties such as their high transparency from visible to infra-red wavelengths, well-controlled refractive indices, reasonable temporal and temperature stability, low optical losses, easy fabrication process and low costs [7][8][9][10][11][12][13]. Substrates play a key role for photonics devices, therefore integration of optical waveguides and opto-electronic components onto transparent paper and flexible foils introduces a new concept of optical interconnection and flexibility into the on-board optical communications [14], [15].…”