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8 March 2016 Four-mode semiconductor optical amplifier
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We report the first demonstration of a four-mode semiconductor optical amplifier (FM-SOA), with strategically positioned quantum-well layers to provide modal-gain control with uniform electrical pumping. On-off gain of 11 dB was demonstrated for all four modes (E11, E12, E21 and E22). The difference in on-off gain among all four modes is less than 1 dB in the range of 2-11 dB without any deliberately pumping profile control. Particular challenges with FM-SOA that must be overcome in comparison with traditional single mode SOA are discussed.
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He Wen, Yousef Alahmadi, Patrick LiKamwa, Cen Xia, Christian Carboni, and Guifang Li "Four-mode semiconductor optical amplifier", Proc. SPIE 9774, Next-Generation Optical Communication: Components, Sub-Systems, and Systems V, 977406 (8 March 2016);

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