Optical cable television transmission system

Details Optical cable television transmission system Optical cable television transmission system

H - Electricity

04

J

363/1.8

H04J 14/02 (2006.01) H04B 10/02 (2006.01)

Patent

CA 2034233

ABSTRACT OF THE DISCLOSURE The invention is based on the problem of transmitting a frequency-division multiplex signal occupying a broad frequency band, e.g., the cable television frequency band of 47-440 MHz, over an optical waveguide transmission section. According to the invention, in the transmitting unit, the whole frequency band to be transmitted is divided into two sub-bands (FB1, FB2), and the lower sub-band (FB1) is converted by means of single-sideband amplitude modulation of a high-frequency carrier (f0) into a higher-frequency transmission frequency band, e.g. 497- 688 MHz, which is less than one octave in width, based on its lowest frequency. The lower sub-band (FB1) and the transmission frequency band produced by the conversion are converted separately into optical signals with different wavelengths (.lambda.1, .lambda.2) and are transmitted in a wavelength multiplex procedure via the optical waveguide. Because of the limitation of less than one octave, second-order intermodulation products, which are usually formed during conversion into an optical signal, fall into unoccupied frequency regions. A corresponding reverse processing is carried out on the receiving side.

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