IdealPhotonics' 1260-1360nm DFB diode, based on an InGaAsP/InP strain-compensated quantum well and a high-precision Bragg grating (±0.03nm control accuracy), is a single-longitudinal-mode laser achieving a side-mode suppression ratio of >65dB and wavelength stability of ±0.003nm/℃. It demonstrates 0.001nm-level spectral resolution in key O-band applications such as 1310nm fiber optic communication, 1330nm methane detection, and 1350nm tissue spectroscopy. Its modulation linearity is 8 times higher than conventional devices, making it a benchmark light source for high-speed optical communication and precision molecular detection.Employing an InGaAsP/InP strained superlattice and atomic layer-deposited Bragg gratings (period control accuracy ±0.02nm), this device achieves a record-breaking side-mode suppression ratio of >65dB and wavelength stability of ±0.002nm/℃. It simultaneously meets the high-speed and high-precision requirements in applications such as 1310nm fiber optic communication (25Gbps direct modulation) and 1335nm greenhouse gas detection (0.1ppb sensitivity). Its -158dB/Hz relative intensity noise and 0.8MHz ultra-narrow linewidth make this device the only dual-standard light source capable of handling both optical communication and spectral detection.