Data dependant biasing for nonlinear devices

A way to counter data dependant skewing of biases in transmitted data signals. Data that does not have a random mixture of 11111 and 110'' levels may cause receiving amplifiers to develop a net dc offset or bias. Such an offset may degrade performance. In order to counter such offsets the data can be averaged and a DC offset determined. Using the DC offset to set a bias point for the data transmitter may counteract the DC offset. For example the DC offset may be used to set the levels of light intensity that carry the data in a fiber optic system. The data may have to be slightly delayed at the transmitter while the DC offset is determined, however at high data rates such offsets may be made negligible, and in other non real time systems, for example video delivery systems, even relatively long delays may be negligible.