A new predistortion scheme for reduction of intermodulation distortion in optical cable TV SCM receivers

摘要

AbstractA new predistortion scheme for cancellation of second‐order intermodulation (IMD) products in broadband optical subcarrier multiplexing (SCM) receivers is presented. This method relies on the phase inversion provided by a common‐source FET amplifier, which allows the compensation of the even‐order distortion products, generated in a cascade of two such stages. Also, it is shown how a careful selection of the FET's bias point can be a valuable tool for controlling the remaining odd‐order IMD components. An optical‐receiver prototype based on these ideas is evaluated. © 1994 John Wiley