Wavelength conversion using electroabsorption modulator was analyzed for two operating conditions:without delayed interferometer structure and with delayed interferometer structure.It′s proved by 10Gb/s returntozero signal wavelength conversion experiment that long pulse trailing edge of the converted signal can be mitigated obvisouly and the exticion ratio of the coverted signal can be improved sigificantly.Meanwhile,the influencen of operating parameters including bias voltage,data signal power,and wavelength on conversion performance were studied in detail.It′s found that the proper setting bias voltage can optimize receiver sensitivity of the converted signal for two operating conditions and delayed interferometer can introduce nearly 2.0 dB sensitivity gain under -3.0 V bias voltage.