Predistorter for high frequency optical communications devices

摘要: A generalized frequency dependent predistortion circuit for nonlinear optic devices includes a pre-filter and post-filter associated with linearizer (distorter). multi-channel sub-carrier electrical signal is input to splitter (72) which provides on primary path (50) time delay hence coupler the secondary paths. In first (52), (56) second order distorter (58). This then subject (60) variable attenuator (68). path, third (54) again has an (62) (66) (70) downstream of post-filter. The attenuators in each provide independent attenuation. one version distorters both paths are diode circuits. very low fundamental leak-through.