Automatic adjustment of optical power output of a plurality of optical transmitters

An apparatus for automatically adjusting the optical power output of multiple optical transmitters. Each of the optical transmitters is optically interconnected to a common optical repeater. The optical repeater is responsive to optical signals received from each optical transmitter to adjust the optical output levels of these optical transmitters to a common level by transmitting signals back to the optical transmitters. The optical repeater commences the adjustment procedure upon detection that one or more of the optical transmitters is transmitting above or below a predefined power level.