The experiment results of improved performance of all optical time division multiplexing to wavelength division multiplex conversion are reported. Demultiplexing of optical time division multiplexing is demonstrated based on the cross gain modulation (XGM) in a semiconductor optica amplifier (SOA). A 1.2 Gbit/s TDM bit stream at 1555 nm is converted to two 622 Mbit/s WDM bit stream at 1544 nm and 1536 nm respectively, in addition, α conversion from wavelength division multiplex (WDM) to optical time division multiplex (DTDM) is available.