A method for constructing a lookup table for modulated grating Y-branch lasers based on clustering and combinatorial optimization algorithms

As a new type of DBR tunable laser, Modulated Grating Y-branch (MG-Y) laser has great advantages in the field of optical fiber sensing and demodulation. However, due to the complex tuning relationship of MG-Ylaser and the wavelength switching interval of 50GHz cannot meet the requirements of the existing FBG demodulators, this paper proposes a characterization method of MG-Y laser based on k-means clustering combined with combinatorial optimization algorithm, which the final test time is about 8 hours. Theoretical and experimental tests show that the designed MG-Y laser has an wavelength interval of 0.02nm in the 40nm range, with a better wavelength stabilitythan0.006nm and an output power flatness within 1.6dBm. Compared with the direct traversal current method, this method reduces the amount of test data by 90% and improves efficiency by more than 50%.