Compact and High-Performance Wide-Band Wavelength-Tunable DFB Laser Array Based on REC Technique

In this letter, we present a design for an ultra-wideband matrix grating distributed feedback (DFB) laser array. 8 lasers are arranged in parallel, with one laser per waveguide to avoid grating crosstalk and reflections from other lasers. By employing the reconstruction-equivalent-chirp technique, precise wavelength control of all 8 lasers is achieved, with a wavelength deviation of ±0.2 nm. The wavelength current tuning range of a single DFB laser can reach up to 6.3 nm, resulting in a total tuning range of up to 50 nm, with a side-mode suppression ratio exceeding 40 dB. Following amplification by the semiconductor optical amplifier, the laser achieves an output power exceeding 40 mW with a relative intensity noise below −130 dB/Hz. The array demonstrates rapid wavelength switching with a switching time of less than $450~\mu $ s, highlighting its application potential in optical communication systems and optical sensing systems.