It is a promising approach to achieving high-speed all-optical signal processing based on the combination of semiconductor optical amplifier (SOA) and optical bandpass filter (OBF). The inverted wavelength conversion (WC) of the nonreturn to zero (NRZ) and the format conversion from NRZ to pseudo return to zero (PRZ) are demonstrated synchronously based on single SOA and an optical bandpass filter with 0.32 nm bandwidth. The conversion results depend on the OBF detuning as respect to the probe carrier. When the OBF detuning is -0.24 nm, the output will be the inverted WC and the filter is used to accelerate the SOA gain recovery. When the detuning is +0.41 and -0.48 nm, the output result will be the NRZ to PRZ format conversion and the generated PRZ pulses appear at the leading edge and trailing edge of the NRZ signal respectively. The filter completes phase modulation to intensity modulation conversion. The converted PRZ signal realizes wavelength conversion as well.