The Mamyshev 2R regenerator is an all-optical regenerator used in optical communications. In 1998, Pavel V. Mamyshev of Bell Labs proposed and patented the use of the self-phase modulation (SPM) for single channel optical pulse reshaping and re-amplification.
Read more about Mamyshev 2R Regenerator: 2R Regenerator Design, Principle of Operation and Design, Mamyshev Regenerator - Variants