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A combined planar lossless optical amplifier and 1 × 2 power splitter device has been realized in Al2O3:Er3+on silicon. Net internal gain was measured over a wavelength range of 40 nm across the complete telecom C-band (1525-1565 nm). Calculations predict net gain in a combined amplifier and 1 × 4 power splitter device over the same wavelength range for a total injected pump power as low as 30 mW.
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Bradley et al. (2010) studied this question.
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