Ambedkar Institute of Advanced Communication Technologies & Research 
In this project, we have built a free space optical system to communicate between two computers. The communication system consists of two identical transceiver circuits at each end of the link to provide full duplex capability. The transmitter uses a Laser source and the receiver uses a photo-detector. The two computers transmit and receive data through serial ports using RS 232 protocol. The transceiver circuitry and the computer interface are presented in detail in the following sections. Communication is established through a program developed in TURBO c++. Transmission occurs in asynchronous mode.