Optical cable television transmission system

Details Optical cable television transmission system Optical cable television transmission system

1991-09-12

1992-07-07

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04J 1402

Patent

active

051287900

ABSTRACT:
To transmit a frequency-division multiplex signal occupying a broad frequency band, e.g., the 40-440 MHz cable television frequency band, over an optical-fiber transmission link, in the transmitter, the whole frequency band to be transmitted is converted by single-side-band amplitude modulation of a high-frequency carrier f.sub.0 to a higher-frequency band, e.g., 840-1240 MHz, which, referred to its lowest frequency, is less than one octave wide. Second-order intermodulations products, which usually result during electric-to-optical conversion, thus fall into unoccupied frequency ranges. At the receiving end, corresponding demodulation is performed employing either carrier recovery or a locally generated carrier. In a preferred embodiment, the frequency band to be transmitted is converted to the higher frequency band in several subbands.

REFERENCES:
patent: 3939341 (1976-02-01), Graves
patent: 4135202 (1979-01-01), Cutler
patent: 4210803 (1980-07-01), Ih
patent: 4512025 (1985-04-01), Frankel et al.
Mendis, I.V.C., Thung, T. T., and Selvan, B., Electronics Letters, vol. 24, No. 7, "20 km Single Mode Optical Fibre System For Multichannel Video," Mar. 31, 1988, pp. 442-443.
IEEE Transactions On Communications, Band COM-29, Nr. 6, Jun. 1981, New York H. J. Matt U. K. Fussgaenger "Integrated Broad-Band Communication Using Optical Networks-Results of an Experimental Study".
Proceedings Of The Ire, Band 44, Nr. 12, Dec. 1956, New York J. F. Honey U. D. K. Weaver "An Introduction to Single-Sideband Communications".

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