Within this project, a data transmission segment will be set-up with a fibre length of 5 km and the transmission of video as well as audio signals are studied. The project starts with the connection of the fibres to the transmitter and receiver. In the next step, the electronic connections are made. The set-up comes with a colour CCD video camera and a CD-player as an audio source and a TV screen as a monitor. This project demonstrates in an impressive way the new exiting telecommunication via optical glass fibre.

Principle of operation

The video signal of the CCD camera (CCD) is fed to the high speed modulator (HSM) of the diodelaser (LD) which is mounted into the same housing of the diodelaser in order to achieve the highest possible bandwidth. The light of the diodelaser is collimated by the optics (C1) and focused by means of (L1) into the 5000 m long multimode fibre.
The laser light at the exit of the fibre is focused by means of the lens (L2) onto the sensitive area of a high speed Si PIN photodiode from where it is fed to the amplifier unit (HSA).
A video monitor is used to display the transmitted video as well as the audio signal when the provided CD player is used.