Fig. 1. Schematic diagram of a wavelength-swept laser based on a galvo mirror. C: Collimator, DG: diffraction grating, G: galvo scanner, M: mirror, O: output of wavelength-swept laser, OC: optical coupler.

Fig. 2. (a) Timing diagram of the wavelength-swept laser (red) and 3.3 V trigger signal (black). (b) Amplified output of the wavelength-swept laser, each at 100 mV voltage increment to the galvo scanner. (c) Single linewidth plot at 856 nm center with a 0.05 nm (∼20  GHz) 3 dB linewidth.

Fig. 3. Relation between input voltage and galvo scanning mirror and corresponding emitted spectrum as shown in Fig. 2(b).