IdealPhotonics' 1200-1260nm DFB diodes, based on InGaAs/AlGaAs or InGaAsP/InP material systems, are distributed feedback lasers. Employing a high-precision Bragg grating (period control accuracy ±0.2nm) to achieve single-mode output, they feature ultra-narrow linewidth (typically<1MHz) and excellent wavelength stability (±0.01nm/℃). These diodes demonstrate irreplaceable technological advantages in near-infrared precision spectroscopy applications such as fiber optic sensing (1064nm), gas detection (1130nm water vapor absorption line), and medical diagnostics (1150nm tissue imaging).A strain-optimized InGaAs(P)/InP quantum well and a high-precision Bragg grating (±0.1nm periodic control) are used to achieve single-mode output, combining ultra-narrow linewidth (