Fig. 1. Structure and tuning principle of MG-Y tunable laser. (a) Diagram of structure; (b) vernier tuning principle

Fig. 2. Automated test system of MG-Y tunable laser

Fig. 3. Flow chart of fast automated test scheme of MG-Y laser

Fig. 4. Tuning paths of I_RR and I_LR covering wavelength range of 40 nm. (a) Relationship among output wavelength, I_RR, and I_LR; (b) current tuning paths of I_RR and I_LR with 0.4 nm wavelength interval

Fig. 5. Spline interpolation of path 1. (a) Generating I_RR array through wavelength interpolation; (b) generating I_LR array through I_RR interpolation

Fig. 6. Target wavelength retrieval based on spline interpolation. (a) Tuning characteristics of current in phase region; (b) deduplication and stitching of linear tuning sections; (c) target wavelength retrieval by spline interpolation; (d) current tuning curves of path 1 with 8 pm wavelength interval

Fig. 7. Calibration of output power of laser. (a) Output power curve of laser when I_SOA is fixed at 100.76 mA; (b) tuning characteristic of I_SOA; (c) calibrated output power; (d) full C-band current tuning curves

Fig. 8. Diagram of fiber-optic EFPI demodulation system based on MG-Y laser

Fig. 9. Demodulation results of optical fiber EFPI. (a) Interference spectrum; (b) demodulated cavity length