Free space optical communication(FSO)is integrated with fiber communication and wireless communication. It is a new method of network with wireless optical access. It is now widely applied in free space communication and some special situations, for its discount wedding dresses exclusive advantage compared with fiber and wireless communication, cost declining of laser diode and developing of high sensitivity receiver and communication lace wedding dresses equipment, free space optical communication has become one choice of next generation of optical communication. So the dissertation researches the key technology of optical transmitter that could be suitable for cheap wedding gown dresses .Based on the Analysis of structure of OOK, PPM, DPIM, which are typical FSO modulations, the dissertation compares the three modulations in bandwidth demand, transmission capacity, power demand and error performance. Theoretical analysis and simulation results show that: custom made prom dresses is easy to get, does not need symbol synchronization, has the minimum bandwidth demand, but low-power utilization; PPM greatly improves the power utilization, but has the chi flat iron store lowest bandwidth utilization, also needs symbol synchronization; DPIM has higher power utilization compared to OOK, higher bandwidth utilization compared to DPIM, and does not need symbol synchronization. So DPIM has significant advantage in free space optical communication.
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