The KG-TLS type tunable laser source uses high-performance DFB lasers with a wavelength tuning range>34nm and a fixed wavelength interval (1GHz \ 10 GHz \ 50GHz). It’s wavelength internal locking function ensures that the wavelength or frequency of the output light is on the ITU grid of the DWDM channel. It has the characteristics of high output optical power (20mW), narrow linewidth, high wavelength accuracy, and good power stability. It can achieve remote control of instruments, mainly used in WDM device testing, fiber optic sensing, PMD and PDL measurement, as well as optical coherence tomography (OCT) and other fields.