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. 2016 Jul 6;6:29128. doi: 10.1038/srep29128

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WDM: wavelength-division multiplexer; HCEDF: high concentration erbium-doped fiber; PC: polarization controller; PI-ISO: polarization-independent isolator; TI SA: topological insulator saturable absorber; OC₁: 90:10 optical coupler; OC₂: 50:50 optical coupler; PBS: polarization beam splitter.