Fabry-Perot lasers (FPL) are laser diodes that use laser resonators and whose maximum output is at wavelengths of 1,300 nm.
The spectral width of the radiation of Fabry-Perot lasers is 7 nm. Due to their high spectral purity, Fabry-Perot lasers reduce the influence of chromatic dispersion and are used, among other things, in 10 Gigabit Ethernet.
The Fabry-Perot laser consists of two specially constructed semiconductor wafers, one negatively doped and one positively doped. Between these two semiconductors lies an active material that forms the resonant body. When electric current flows between the two semiconductor wafers, the laser cavity emits light that is reflected at the partially reflective end faces.
The wavelengths of the light emitted by the FPL laser cover a broad wavelength spectrum from visible light to far infrared with wavelengths >15 µm.