An optical multi-wavelength conversion method for distributed satellite system based on the nonlinearity of SOAs

It is highly necessary to share information between satellites in optics distributed satellite system. The signals usually need to be multi-casted to several nodes. The initial signals can be copied to several wavelengths directly by multi-wavelength converting technology. So it is an efficient way to solve the issue of optics multicast in distributed satellite network. To realize the optics multicast in distributed satellite system, an optical multi-wavelength conversion method based on the nonlinearity of semiconductor optical amplifier (SOA) is put forward. Firstly, by making use of the SOA’s property of spectrum broadening combined with offset filter, the initial signal is filtered by blue-shifted filter and red-shifted. The pre-conversion and detecting signals are produced respectively. Then the multi-wavelength conversion is realized based on the four-wave mixing (FWM) in another SOA. As is obtained by dividing the initial signals, the pre-conversion and detecting signals can be synchronized more easily. The results show that the output Q factor for each channel is promoted and varies with wavelength and signal input power. The power improvement is more than 15dB and the maximum value is 27dB.