An apparatus controls the optical output intensity of a laser diode 52 used in an optical communication system. The laser diode 52 receives current from a pulse current supply 74 and a bias current supply 72. The optical output intensity of the laser diode 52 is controlled via a closed bias current control...http://www.google.se/patents/US4945541?utm_source=gb-gplus-sharePatent US4945541 - Method and apparatus for controlling the bias current of a laser diode
