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. More recent applications target the field of ultrashort high peak-power pulse generation. 2R regenerator design The schematic of the conventional Mamyshev regenerator is shown below. A High-Power Erbium doped fiber amplifier (HP-EDFA) boosts the incoming signal to the power (Pm) required for optimal peak power equalization of the ‘one’ symbols. This amplifier can be followed by an optical bandpass filter (not shown in the figure) in order to reject out of band amplified spontaneous emission. The self-phase modulation-induced spectral broadening is generated in a single-mode optical fiber with a length . The chromatic dispersion of this fiber is normal and its value is D. The nonlinear coefficient is , and the linear losses are . Several types of fibers have been successfully tested : non-zero dispersion-shifted fibers, highly nonlinear silica fibers (HNLF), microstructured silica fibers, chalcogenide fibers or tellurite fibers. At the fiber output, an optical bandpass filter (OBPF) with a FWHM spectral width , (defined such that the pulse width at the output is the same as that at the input of the system), is spectrally offset by an amount with respect to the input signal carrier wavelength and is used to carve into the broadened spectrum - thereby acting as a pulse reshaper. This is the unit configuration, which may be repeated for higher accuracy of the regeneration. It has been shown possible to advantageously replace the nonlinear fiber by a highly-nonlinear chalcogenide waveguide, therefore opening the way to all-integrated photonic chip regeneration. Principle of operation and design The Mamyshev regenerator can handle return-to-zero signals with ultrahigh data bit rates. Indeed, thanks to the quasi-instantaneous response of the nonlinear Kerr effect, this regenerator does not suffer from the finite recover time of some saturable absorbers. The interest of the Mamyshev regenerator lies in its ability to regenerate simultaneously the 'ones' and 'zeros' bit of information. The key effect affecting the pulse evolution in the regenerator is the self-phase modulation that broadens the spectrum in proportion to the intensity of the initial optical pulse. Combined with an output frequency offset OBPF, this constitutes an efficient ultrafast thresholder. In more details, low intensity pulses or noise do not broaden significantly and fall