Ultra-Fast Broadband Wavelength-Swept DFB Laser Array with 400 kHz Sweep Rate and 60 nm Continuous Tuning Range

作者：Yaqiang Fan, Yuan Lv, Haolin Xia, Jingxuan Zhang, Zhenxing Sun, Wei Yuan, Yue Zhang, Pan Dai, Jiayi Xu, F. Wang, Xiangfei Chen · 发表于：ACS Photonics · 年份：2026 · DOI：10.1021/acsphotonics.5c01159 · 被引用次数：1 · 研究领域：Advanced Fiber Optic Sensors、Optical Coherence Tomography Applications、Photonic Crystal and Fiber Optics

Fast broadband wavelength-swept lasers (WSLs) are core components in optical sensing fields such as fiber Bragg grating (FBG) sensing and optical coherence tomography. This work presents a novel WSL based on a distributed feedback (DFB) laser array combined with enhanced self-heating effects, achieving a 400 kHz sweep rate and a continuous (gap-free) wavelength tuning range of 60 nm, with a tuning speed exceeding 24 nm/μs. To the best of our knowledge, this work achieves the highest sweeping frequency reported for broadband (>30 nm) WSLs based on DFB laser arrays up to now. The reconstruction-equivalent-chirp technique simplifies grating fabrication and improves the accuracy of wavelength interval control, with the wavelength error measured to be within ±0.2 nm. Reducing the doping concentration in the p -waveguide region enhances the self-heating effect, enabling a continuous tuning range of over 5 nm per channel. The DFB laser array exhibits side-mode suppression ratios >45 dB, output power >55 mW, and relative intensity noise below −130 dB/Hz. The proposed WSL was successfully applied in an FBG sensor interrogation system, where the wavelength fluctuation over 5000 continuous interrogation cycles was less than 2 pm (within ±1 pm), demonstrating outstanding wavelength sweeping repeatability. In temperature measurement experiments (−30 to 90 °C) and strain measurement experiments (−800 με to 800 με), the interrogation linearity of all FBG sensors was greater than 0.9993. In ...