Method and apparatus for communicating amplitude modulated signa

Details Method and apparatus for communicating amplitude modulated signa Method and apparatus for communicating amplitude modulated signa

1991-03-11

1993-05-18

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359145, 359181, H04B 1004, H04B 1000

Patent

active

052125793

ABSTRACT:
A block of amplitude modulated television channel signals frequency modulates an optical communication path. In one embodiment, the AM modulated channel signals FM modulate an RF subcarrier which, in turn, is used to intensity modulate an optical carrier for transmission. Frequency modulation of the RF subcarrier by the amplitude modulated channel signals is advantageously performed at microwave frequencies. The FM modulated subcarrier signal is then converted down to a frequency range compatible with transmitter and receiver components used in the system. The frequency modulation and conversion can be performed by a pair of voltage controlled oscillators coupled in a push-pull mode of operation. The outputs of the oscillators are combined in a double balanced mixer to down convert the FM signal spectrum. In another embodiment, the optical frequency of an optical carrier is FM modulated by the block of AM signals. Receivers for the FM modulated band of AM channel signals are also disclosed.

REFERENCES:
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patent: 4561119 (1985-12-01), Epworth
patent: 4768186 (1988-08-01), Bodell
patent: 4891694 (1990-02-01), Way
patent: 4916532 (1990-04-01), Streck et al.
patent: 4924473 (1990-05-01), Burgyan et al.
patent: 4959862 (1990-09-01), Davidou et al.

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