RF gain stabilization of a directly modulated optical link using detector current normalization

We report the theoretical basis for, and experimental demonstration of, a technique which uses the average photodetector current to stabilize the RF gain of a directly modulated optical link. The initial results show that a 9 dB change in link gain can be reduced to less than 0.4 dB. The possibility of extending the technique to stabilizing the noise figure is also briefly discussed.<>