Fig. 7
From: Ultra-high on-chip optical gain in erbium-based hybrid slot waveguides
Edge-coupling waveguide measurement setup. The components in the setup are as follows: ECL: external cavity laser, SMF: single-mode fiber, PC: polarization controller, LD: laser diode, WDM: wavelength-division multiplexer, SM-PMF: single-mode polarization-maintaining fiber, Cam: camera, OSA: optical spectrum analyzer, COM: computer
