Everybody know what a LED is, in Christmas tree, in your house decoration, in the lights of your car, every day a new way to use LED is getting out to amuse us and knowing how bright it might get depending how many you have together surely, they’ll be more new stuff coming up for us. Today we’re going to talk about more of the technical part of this devices.
Quick review of the function of illumination diodes
Laser diodes and the more familiar light-emitting diodes (LED) are similar in that both consist basically of a p-n junction in which radiative recombination occurs under forward bias by the injection of carriers into a suitably designed region of the diode.
Large differences exist, however, in the specific device design and materials needed to obtain efficient lasing at room temperature. The GaAs and AlGaAs heterojunction diodes where tested where the most efficient diode operation has been obtained at room temperature, including CW laser operation with the emission of tens of milliwatts of power.
These diodes emit radiation in the 8000–9000 Å spectral region, depending on the alloy composition, a region well-suited for low loss (<10 dB/km) optical fibers. Reduced fiber attenuation and pulse dispersion are obtained at these longer wavelengths.