Superluminescent diode
![a) Facet feedback and wavelength resonances in the optical emission spectrum of a multimode Fabry-Perot laser; b) power spectral density of a superluminescent light emitting diode.](/Images/godic/202502/14/SLED_LD.svg4203.png")
![Typical dependence of the fibre-coupled optical power vs. injected current for a SLED module with a central wavelength of 1550 nm, a 3-dB bandwidth of 60 nm and a typical output power of 1.5 mW at 20°C.](/Images/godic/202502/14/Optical_power_versus_injected_current_for_a_SLED.svg4203.png")
![Typical dependence of the optical power density versus wavelength for a Superluminescent diode module with a central wavelength of 1560 nm operated at 350 mA.](/Images/godic/202502/14/Optical_Power_Peak_Center_for_SLED.svg4203.png")
![Typical spectral ripple of a 1300 nm SLED at its maximum output power.](/Images/godic/202502/14/Spectral_ripple_of_SLED.svg4203.png")
A superluminescent diode (SLED or SLD) is an edge-emitting semiconductor light source based on superluminescence. It combines the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes. Its emission band is 5–100 nm wide.