A light source module (200) for use in the field of optical communications is provided. The light source module (200) includes a substrate (202), a light source (201), an optical interface (203), and an electrical interface (204). The light source (201) and the electrical interface (204) are disposed on the substrate (202). The electrical interface (204) is configured to supply power to the light source (201). The optical interface (203) is coupled to the light source (203), and the optical interface (203) is configured to output continuous light energy emitted by the light source (201). The optical interface (203) and the electrical interface (204) face a same direction. The light source module is detachably connected to a panel. The light source module (200) has advantages of reducing component replacement cost for an optical communications device, extending a service lifespan of the light source (201), and reducing replacement complexity of failed components.