Fig. 1. Structural diagram of MG-Y laser

Fig. 2. Relationship among wavelength and reflector currents

Fig. 3. Wavelength test frameworks. (a) Distribution of reflector current; (b) test framework A; (c) test framework B

Fig. 4. Wavelengths and SMSRs obtained by scanning along grid line 3. (a) Scanning I_left and fixing I_right; (b) scanning I_right and fixing I_left

Fig. 5. Wavelength tuning paths

Fig. 6. Tuning characteristic of I_phase

Fig. 7. C-band tuning curves of I_left, I_right , and I_phase

Fig. 8. Flow chart of power calibration

Fig. 9. Test systems of MG-Y laser. (a) Wavelength stability and repeatability test system; (b) fiber EFPI cavity length demodulation system

Fig. 10. Accuracy of wavelength

Fig. 11. Stability of power while wavelength tuning

Fig. 12. EFPI demodulation results of optical fiber . (a) Interference spectrum; (b) demodulated cavity length