In the modern communication system, more and more signal multiplexing technologies have been applied to increase the capacity of the communication systems. On top of the mostmature wavelength division multiplexing (WDM), the polarization division multiplexing (PDM) technique can increase the spectral efficiency and thus the system capacity exponentially, by transmitting the two different signals on the orthogonal polarization states. Recently, the research on multi-dimensional multiplexing all-optical signal processing has become a hot research topic. However, the common method for WDM-PDM signal processing were all demonstrated by firstly performing the polarization demultiplexing and then processing separately, resulting the complex operation and high costs. The simultaneous processing based on a single device for the signals utilizing multiple multiplexing techniques without demultiplexing will greatly reduce the costs and improve the conversion efficiency.
Prof. Xinliang Zhang, Yu Yu and student Wenhan Wu form OEDI division of WNLO have propose and experimentally demonstrate the all-optical amplitude regeneration for the WDM-PDM return-to-zero phase-shift keying (RZ-PSK) signals using a single semiconductor optical amplifier (SOA).4 WDM-PDM RZ-PSK signals at 20G Baud rate can be amplitude regenerated with an average power penalty improvement of 1.75dB at 10−9.
The study has been published in Optics Express, Vol.21, No.6, pp.6718-6723 (2013). This work was partially supported by the National Basic Research Program of China (Grant No. 2011CB301704), National Natural Science Foundation of China (Grant No. 61007042 and 61275072), National Science Fund for Distinguished Young Scholars (No. 61125501) and the Fundamental Research Funds for the Central Universities (Grant No. 2012QN104).
Fig. 1. The measured eye diagrams for two of the input channels.