K. M. Kiani, Henry Frankic, R. Mateman, A. Leinse, A. Knights, J. Bradley
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High Gain Thulium-Doped Tellurium Oxide Waveguide Amplifier for Optical Communication in the $2-\mu \mathrm{m}$ Window
In this work, we present on a thulium-doped tellurium oxide (TeO2:Tm3+) waveguide amplifier on a silicon nitride (Si3N4) waveguide platform with 14.7 $\text{dB}$ internal net gain at 1870 nm under 1607 nm pumping, corresponding to 2.96 dB/cm. Gain measurements were carried out in straight, paperclip and 5-cm-long spiral waveguides realized on a 1.0-cm-long chip. The device is fabricated using CMOS-compatible and wafer-scale processing steps, enabling compatibility with existing photonic integrated circuit (PIC) technology.
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