IEEE Summer Topicals : SDM. Paper WC3.6
http://ieeexplore.ieee.org/xpl/articl...
Title : All optical degenerate mode-group multiplexing using a Mode Selective Switch
Abstract: A Mode Selective Switch based around an LCoS Spatial Light Modulator is demonstrated to optically demultiplex modes with the same propagation constants to the same output fibres, using a common phase mask for all channels.