**Acknowledgement**

I am indebted to Mr. Y. Miyazaki, Mr. T. Sakamoto, Ms. J. Aruga, Mr. T. Suzuki and Dr. Y. Arimoto for the help and support during NG-FSO system development and experiment and to Dr. M. Matumoto, Dr. K. Wakamori, Dr. K. Kazaura, Mr. T. Suzuki, Dr. S. Komaki, Dr. K. Tukamoto, and Dr. T. Higashino for NG-FSO system and RoFSO system experiment and evaluation.

This work is supported by a grant from the National Institute of Information and Communications Technology (NICT) of Japan.

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