A bit rate adaptable all-optical wavelength conversion operation of a semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI) with a selectable push-pull-delay configuration, consisting of silica-based MZI-type variable power splitters and cascaded delay switches, was achieved. It consists of two SOAs, one variable power splitter, four MZI-type switches, and three delay lines on one chip. Eight-level delay times, from 0 to 35 ps, incremented in steps of 5 ps, can be selected by controlling the voltages applied to the thermo-optic switches. The wavelength conversion operation at a bit rate of 25 and 40 Gbps with push-pull delay of 20 and 15 ps was achieved. (C) 2013 Optical Society of America