Narrow spectral width surface emitting LED for long wavelength multiplexing applications.

We discuss a novel surface emitting InGaAsP LED with a relatively narrow spectrum obtained by the integral growth of a 2.6 micron thick semiconductor absorbing, or filtering, layer on a conventional double heterostructure device. In addition, the narrow spectrum may prove useful in moderate bit rate (>100 Mb/s) multimode transmission systems where the output from broad spectrum, conventional surface emitting LEDs leads to unacceptably high levels of signal dispersion.