| 摘要 |
A method for information transmission in an optic communication system, information is transmitted over an optic line simultaneously over two channels via conversion of electric signals to optic signals using two diodes. Optic signals from both laser diodes are supplied to a spectral multiplexor, than signals are transmitted over an optic-fiber line. On the other side of line signals are transmitted to a spectral demultiplexor, after distribution the said signal along wave length each of which is transmitted to its own photoreceiver. Over one channel a reference signal is transmitted, over another channel – an information signal in the form of binary zero and binary unit, which are coded using pulse or potential code. Binary one is transmitted using zero potential, binary zero- using higher potential, power of which equals to amplitude of constant signal, at the receiving part electric signals of both channels are compared in a comparison device and the constant signal and information signal are subtracted. The resulting information signal is supplied to regulating device, which reduces thereof to zero level. |
