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We experimentally demonstrate 40 Gb/s semiconductor-optical-ampfifier-based tunable wavelength conversion (WC) using a detuning optical bandpass filter.Both inverted and non-inverted WCs are obtained by shifting the filter central wavelength with respect to the probe wavelength.When the filter is red shifted by 0.4 nm or blue shlfted by 0.3nm,the WC is non-inverted.However,when the filter is blue shifted by 0.1 nm,the WC is inverted.It is experimentally demonstrated that the WC has a tunable range covering the C-band.