OPTICAL DELAYS MULTIPLEXING AND DEMULTIPLEXING SYSTEM FOR THE TRANSMISSION OF SIGNALS ON OPTICAL FIBER

摘要

Multiplexing and demultiplexing system involving optical delays, for the transmission of signals on optical fibre with the possibility of interactivity between the transmitters and the receivers. This system comprises a plurality of paths, multiplexing stages formed of a plurality of light sources 1A, 1B, ..., 1N and means 2A, 2B, ..., 2N for assigning, to each of the said multiplexing stages, predetermined optical delays greater than the coherence length L of the sources (where L = 2/ [lacuna] with: [lacuna] emission wavelength; [lacuna] = spectral width of a source) and in which the light undergoes a modulation of the optical delay under the effect of a signal without involving a modulation of luminous intensity, a demultiplexing stage or a plurality of demultiplexing stages formed by means 6A, 6B, ..., 6N for producing an optical delay in any one of the said demultiplexing stages of a value substantially equal to the optical delay in any one of the multiplexing stages, means 7A, 7B, ... 7N for ensuring the detection of the demodulated signal by each of the said demultiplexing stages. Application to optical telecommunications. IMAGE