WAVELENGTH CONVERSION AT 10 GB S BY 4-WAVE-MIXING OVER A 30-NM INTERVAL/

We show that the use of a long semiconductor optical amplifier increas es the error-free conversion interval of a four-wave mixing (FWM)-base d wavelength converter. 30-nm wavelength down-conversion and 15-nm up- conversion have been obtained at 10 Gb/s, This result is a significant improvement over the previous best performance of a FWM-based wavelen gth converter and suggests that the full erbium-doped fiber amplifer b andwidth can be covered with FWM wavelength converters.