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https://scholars.cityu.edu.hk/en/publications/ersup3sup-ybsup3sup-codoped-polymeric-optical-waveguide-amplifier/ Er3+ - Yb3+ codoped polymeric optical waveguide amplifiers - CityUHK Scholars waveguide amplifiers polymeric optical scholars https://research.tue.nl/nl/publications/toward-wide-band-low-loss-gap-waveguide-integrated-grid-amplifier/ Toward wide-band low-loss gap-waveguide-integrated grid amplifiers - Onderzoeksportaal Eindhoven... wide band https://theses.gla.ac.uk/74857/ Rare Earth Doped Silica for Integrated Optical Waveguide Lasers and Amplifiers - Enlighten Theses