1.  E. Narevicius, "Method and Apparatus for Optical Mode Division Multiplexing and Demultiplexing", US patent 7,609,918
  2. E. Narevicius, I. Vorobeichik, Y. Berlatzky, R. Narevich, "Method and Device for Optical Switching and Variable Optical Attenuation", US patent 7,321,705
  3. I. Vorobeichik; M. Greenberg, Y. Berlatzky, E. Narevicius, R. Narevich, "Method and Apparatus for Optical Mode Conversion", US patent 7,218,814