Optical cable television transmission system

Details Optical cable television transmission system Optical cable television transmission system

1991-01-15

1992-11-10

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359154, H04J 1402

Patent

active

051629372

ABSTRACT:
The invention is based on the problem of transmitting a frequency-division multiplex signal occupying a board 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 (FB.sub.1, FB.sub.2), and the lower sub-band (FB.sub.1) is converted by means of single-sideband amplitude modulation of a high-frequency carrier (f.sub.0) 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 (FB.sub.1) and the transmission frequency band produced by the conversion are converted separately into optical signals with different wavelengths (.lambda..sub.1, .lambda..sub.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.

REFERENCES:
patent: 4691375 (1987-09-01), McGeehan et al.
patent: 4722081 (1988-01-01), Fujito et al.
patent: 5016242 (1991-05-01), Tang
patent: 5020049 (1991-05-01), Bodeep et al.
patent: 5058102 (1991-10-01), Heidemann
Meeting of the Society of Cable Television Engineers, Jan. 18-20, 1988, pp. 5-6.
Patent Abstracts of Japan, Band 6, Nr. 42 (E-098), 16, Marz 1982 & JP-A-56 158 532 (Yagi Antenna) 07-12-1981 *Zusammenfassung*.
IEEE Journal on Selected Areas in Communications, Band 6, Nr. 6, Jul. 1988, Seiten 974-986, IEEE, New York, N.Y. US; G. J. Foschini: "Sharing of the Optical Band in Local Systems" * Seite 976, rechte Spalte, Absatz 2-Seite 977, linke Spalte, Absatz 3*.

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