a method of closed loop control for an optical link is presented , utilizing a copper feedback connection between the optical transmitter and optical receiver , suitable for short distance applications . an architecture is provides that may be used to define and maintain an optimum optical launch power for a defined bit error rate , guaranteeing extinction ratio and absolute optimum operating power . the invention also includes the use of such a loop in achieving fast link initialization and dynamic optimization to compensate for all effects of time and temperature for all components within the link .