Fig. 5 | Nature Communications

Fig. 5

From: Ultra-high on-chip optical gain in erbium-based hybrid slot waveguides

Fig. 5

Transmission characterization of the uncoated and hybrid slot waveguides. Transmission of the signal beam (λc = 1533 nm) at the output of a 0.04, 1.01, 1.44, and 1.92 cm long uncoated Si3N4 slot waveguides and b 0.025, 0.070, 0.120, 0.220, 0.320, and 0.400 cm long Er:Al2O3–Si3N4 hybrid slot waveguides. In a and b, the solid points correspond to the experimentally measured transmission values with ±0.60 dB signal level accuracy, whereas the solid lines are the theoretical linear least-squares fits to the transmission data with R2 = 0.9797 and R2 = 0.9726, respectively

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