An optical, 2R regenerator based on self phase modulation (SPM) spectral broadening, combining a 4 μm wide rib waveguide and a surface relief Bragg grating, both written on a 5 cm-long Si chip is proposed and theoretically analyzed. Because of the SPM nature and its origin of Kerr optical nonlinearities, this regenerator has subpicosecond response time. The nonlinear power transfer curves are plotted using 2.5 ps input pulses and regeneration can be done at 120 Gbit=s. It is tried to do all the simulations on both a Silicon (Si) and a Chalcogenide (ChG) chip with the same size and spectral properties to have a fair comparison between these two materials. Simulations show more practical nonlinear power transfer function with the Si chip comparing to the ChG one. The phase-shifted Bragg grating written on the same rib waveguide is proposed to regenerate 60 ps-wide pulses, for the first time.

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