The Superluminescent Diode is a semiconductor device to beam low-coherence light of a broad spectrum like LED, but High brightness like LD (Laser Diode). Light emitted in a narrow active layer related to LD can be efficiently applied to the fiber. SLD is usually used as an incoherent light source for optical sensors like OCT and optical Fiber Gyroscopes. Superluminescent Emitting Diodes are semiconductor devices that emit broadband light through the electrical current shot. Superluminescent diodes are excellent high-power broadband light sources that are ideal for use in some applications such as Fiber Optic Link testing, WDM PON systems, White Light interferometry, and many other applications.