he wavelength tuning characteristics of a widely tunable modulated grating Y-branch laser operating in a large temperature range was investigated experimentally. The linearly fine-tuning was realized by sweeping the phase region current and the fine lookup table was created with a high resolution of less than 0.1 pm. We found experimentally that the tuned wavelength has an excellent linear correspondence and there are small intercepts among the parallel tuning lines of different temperatures. Based on this special characteristic, an online simple wavelength re-calibration method of "one-wavelength bias picking up and full wavelength range re-calibrating" was proposed and verified experimentally. The verification experiments proved its feasibility and the high tuned wavelength precision and accuracy of ~ 0.1 pm within the temperature range of -25 °C ~ +75 °C was achieved. The tuning accuracy improvement is about two orders for magnitude.

中文翻译：

---

可广泛调谐的 MG-Y 激光器的高分辨率波长调谐技术

实验研究了工作在大温度范围内的宽可调调制光栅 Y 分支激光器的波长调谐特性。通过扫描相区电流实现线性微调，并以小于 0.1 pm 的高分辨率创建精细查找表。我们通过实验发现调谐波长具有良好的线性对应关系，并且不同温度的平行调谐线之间存在小的截距。基于这一特点，提出了一种“单波长偏置拾取全波长范围重校准”的在线简易波长重校准方法，并进行了实验验证。验证实验证明了其可行性以及~0的高调谐波长精度和准确度。在 -25 °C ~ +75 °C 的温度范围内实现了 1 pm。调谐精度的提高大约是两个数量级。