Four-wave mixing (FWM) compensation by using a HLNF and its XPM, Michael Vasilyev and co-workers have proposed, and demonstrated up to 12-channel optical regeneration in 10Gbit/s systems. In other work, taking advantage of counter-propagating scheme, double wavelength regeneration has been demonstrated. The number of channels that can be handled has been increased up to four thanks to polarization multiplexing. Efficient all-optical regeneration based on Mamyshev device has been demonstrated at various repetition rates : 10 Gbit/s, 40 Gbit/s and up to 160 Gbit/s. The Mamyshev regenerator may suffer from a poor yield : the spectral filtering of the expanded spectrum induces high intrinsic energy loss. In order to compensate those losses, distributed Raman amplification can be involved. 3R regeneration The 2R regeneration can be combined with an additional stage of regeneration to provide 3R regeneration. Mamyshev technique has also been used for OCDMA transmission and it has been proposed to use the Mamyshev setup in the framework of optical performance monitoring. The reshaping features of the Mamyshev regenerator have also been combined with a polarization attraction process that enables to simultaneously regenerate thepolarization state and the intensity profile of degraded pulse streams. High peak power ultrashort pulse generation The potential applications of Mamyshev regenerators are not restricted to the field of optical telecommunications. This technique has also been found beneficial in the field of ultrashort and high peak power pulse generation. Indeed, the background improvement and reshaping features of Mamyshev regenerators have opened new perspectives to the use of gain switched lasers and have allowed subpicosecond pulses with peak powers exceeding the megaWatt level to be generated in so-called Mamyshev Oscillators. Other example has been achieved with the contrast enhancement by several orders of magnitude of mJ femtosecond pulse in Argon-filled hollow core fiber. Concatenation of Mamyshev regenerators and use in a fiber-based optical oscillator Concatenation of pairs of Mamyshev regenerators has been numerically studied and has shown that well-defined structures could spontaneously emerge from an oscillator architecture, which has then been experimentally confirmed. Additional investigations have focused on the development of ultrashort high peak power fiber lasers and other cavity designs have been considered. In 2017, record peak powers well above the MW level have been reached. References Fiber-optic communications