| 摘要 |
Optical transmission systems in which interactive services, such as video-on-demand, are to be provided must be low in cost if the services are to find acceptance. This requires, among other things, that as little change to the structure of existing optical transmission systems as possible should be necessary. In the optical transmission system according to the invention, a first frequency-division multiplex signal (ST) is formed from subscriber-assigned video and telecommunications signals at a center (1). Cable television signals (STV) are transmitted with light of a first wavelength, and the first frequency-division multiplex signal (ST) with light of a second wavelength, to at least one optical network termination (3). In the latter, the cable television signals (STV) and the video signals are combined into a third frequency-division multiplex signal. The third frequency-division multiplex signal and the telecommunications signals are combined into a second frequency-division multiplex signal (SS), which is delivered at a port (22) of the optical network termination (3).
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