Light-emitting diode device design.

High radiance light emitting diodes (LEDs) are attractive light sources for optical fiber systems. This paper describes device design principles, specifically covering factors affecting output power and modulation bandwidth. Coupling to fibers is discussed in detail, emphasizing its impact on launched power, sensitivity to fiber-LED alignment, and modulation bandwidth. Finally, the characteristics of GaAlAs and InGaAsP LEDs are discussed, including multi-wavelength devices.