Fig. 6 | Nature Communications

Fig. 6

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

Fig. 6

Gain characterization of the hybrid slot waveguides. a Measured signal enhancements produced by the 250, 700, and 1200 μm long Er:Al2O3–Si3N4 hybrid slot waveguides; Calculated (solid points) and simulated (solid line) modal gain as a function of the injected pump power in b the 250 μm long; c the 700 μm long, and d the 1200 μm long Er:Al2O3–Si3N4 hybrid slot waveguides for a −33 dBm (≡0.5 μW) input signal beam. In a, the measurement level accuracy is ±0.15 dB. In bd, the modal gain of each waveguide (including the error level) has been calculated according to Eqs. (1) and (2) (see Methods), and the regions for the net modal gain and loss are shown in green and red, respectively

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