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Polymeric waveguides doped with nonlinear organic materials have been fabricated by pre- and post-doping techniques. High quality, low-loss planar waveguides have been produced with doping concentrations in excess of 30% by weight. Selective doping has been used to define simple monomode channel waveguide structures. Fast acting nonlinear behaviour has been observed using doped-polymeric waveguides, including nonlinear distributed waveguide coupling with surface relief gratings and intensity-dependent waveguide birefringence.
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M J Goodwin, R Cush, C Trundle, "Nonlinear Polymer Waveguides," Proc. SPIE 0864, Advanced Optoelectronic Technology, (2 June 1988); https://doi.org/10.1117/12.943510