Ultrawideband precise tunable wavelength-locked laser based on high-density integrated distributed feedback laser array

作者：Yaqiang Fan, Zilong He, Haolin Xia, Yuan Lv, Wei Yuan, Pan Dai, Jingxuan Zhang, Zhenxing Sun, Feng Wang, Yuechun Shi, Xiangfei Chen · 发表于：Optics Express · 年份：2025 · DOI：10.1364/oe.564616 · 被引用次数：5 · 研究领域：Advanced Optical Sensing Technologies、Advanced Fiber Laser Technologies、Optical Systems and Laser Technology

We developed and experimentally demonstrated an ultrawideband, precisely tunable wavelength-locked distributed feedback (DFB) laser array in an 8 × 4 matrix with a wavelength tuning range of 80 nm. The reconstruction equivalent chirp technique was applied to simplify grating fabrication and enhance the precise control of wavelength spacing. A cascaded Y-branch sharing an identical active layer with the lasers enabled a one-waveguide output, requiring a small current to compensate for material absorption and thus reducing the fabrication complexity compared with butt coupling. A semiconductor optical amplifier was integrated in front of the laser array to amplify and adjust the optical power. Statistical tests were performed on 640 DFB laser units from 20 randomly selected DFB laser arrays. The results showed that the wavelength of the laser array was precisely controlled, with more than 94% of the DFB laser units having a wavelength deviation within ±0.2 nm. Over 97% of the DFB laser units had a side-mode suppression ratio exceeding 40 dB. The relative intensity noise of all DFB laser units was below -130 dB/Hz. By introducing a wavelength-locked and feedback control system based on Fabry-Perot etalon, the proposed DFB laser array achieved full-band wavelength tuning accuracy within 2 pm without adjusting the thermoelectric cooler for tuning in less than 250 µs. Additionally, wavelength drift caused by changes in thermal equilibrium remained below 10 pm during high- and low-t...