Abstract: we have researched on an all-optical 2R regenerator based a semiconductor optical amplifier(SOA). This regenerator is using the self-phase modulation-induced spectral red shift caused by SOA. Through a subsequent optical band-pass filter, we can regenerate the signal.We research on the regenerator in a 10 Gbit/s, 20 Gbit/s and 40 Gbit/s channels of time division multiplex system respectively. We have confirmed that this scheme can be used in time division multiplex system suitably.