Abstract
As a handy optical space communication system which can be used for school Internet access net building.
1) The examination of the irregularity demodulation form.
2) The development of the most reliable technology which realizes long-distance communication by the high trust.
3) The development of the Point to Multi Point (P-MP) machine which it can communicate by at the same time with the several places due to the realization of the multiplex communication technology.
4) Even if a child sees directly, the research and development of the high-speed big capacity technology in the wavelength obi which harm is not in.
