OPTICAL INFORMATION TRANSMISSION SYSTEM, ESPECIALLY IN THE SUBSCRIBER CONNECTION FIELD

An optical communication system in which transmission takes place in a single optical-waveguide mode by means of low-cost optical transmitters and receivers although two or more modes could propagate in the optical waveguide (1) at the operating wavelength, is supplemented by optical-waveguide sections (2, 3) between the transmitters (S, S1, S2) and receivers (E, E1, E2) and the optical waveguide (1) which are "single-mode" at the operating wavelength and contain the optical connectors (4, 5). This eliminates the need for connectors at the junctions between the optical-waveguide sections ( 2, 3) and the optical waveguide (1), so that no modal noise and modal dispersion can occur as a result of mode conversion.