JPS6490627A - Optical space transmitter by time division multiplex system - Google Patents

Abstract

PURPOSE:To attain simultaneous transmission by applying time division processing to a data signal of each system generated simultaneously, forming a signal string added with a frame bit and transmitting the result after the signal is converted into an optical signal, thereby using a one wavelength optical signal. CONSTITUTION:An oscillation circuit 18 is oscillated at a frequency nfb (fb is bit rate of systems 1-n) and the result is fed to n-stage of selection circuits 20 as a clock 19 in a time base compression circuit 11. A selection clock 21 corresponding to the n-stage is outputted from the circuit 20, a sampling circuit 22 samples each data signal of a data line 17 in time division, the result is subjected to time base compression, and a frame bit is formed, then are multiplexed by a superimposing circuit 23 to output a time division multiplex signal. The signal is code-converted by an encoder 12 and converted into an optical signal with one wavelength by an electrooptic conversion circuit 13 and the result is sent to space. The optical signal is given an photoelectric conversion circuit 14, a decoder 15 and a time base expansion circuit 16 to obtain each data of the systems 1-n.