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 (<500kHz) and ultra-high side-mode suppression ratio (>55dB). It exhibits wavelength accuracy of 0.01nm in near-infrared molecular spectroscopy fields such as 1064nm fiber optic sensing, 1130nm water vapor detection, and 1176nm methane monitoring. Its temperature drift coefficient (±0.008nm/℃) is 5 times better than that of ordinary lasers, making it the gold standard light source for precision spectral analysis.