Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1989-05-31
1991-07-09
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
356 5, H04B 1000
Patent
active
050312340
ABSTRACT:
A reference frequency distribution system for transmitting a reference frequency from a reference unit to a remote unit while keeping the reference frequency at the reference unit and remote unit in phase. A fiber optic cable connects the reference unit to the remote unit. A frequency source at the reference unit produces a reference frequency having an adjustable phase. A fiber optic transmitter at the reference unit modulates a light beam with the reference frequency and transmits the light beam into the fiber optic cable. A 50/50 reflector at the remote unit reflects a first portion of the light beam from the reference unit back into the fiber optic cable to the reference unit. A first fiber optic receiver disposed at the remote unit receives a second portion of the light beam and demodulates the reference frequency therefrom to be used at the remote unit. A second fiber optic receiver disposed at the reference unit receives the first portion of the light beam and demodulates a reference frequency component therefrom. A phase conjugator is connected to the frequency source for comparing the phase of the reference frequency component to the phase of the reference frequency modulating the light beam being transmitted from the reference unit and for continuously adjusting the phase of the reference frequency modulating the light beam being transmitted from the reference unit to maintain a conjugate (anti-symmetric) relationship between the reference frequency component and the reference frequency modulating the light beam whereby virtually no phase difference exists between the phase of the reference frequency component and the phase of the reference frequency modulating the light beam.
REFERENCES:
patent: 3571597 (1971-03-01), Wood et al.
patent: 3863064 (1975-01-01), Doyle et al.
patent: 4287606 (1981-09-01), Lutes, Jr. et al.
patent: 4560270 (1985-12-01), Wiklund et al.
Lutes George F.
Primas Lori E.
Sydnor Richard L.
Adams Harold W.
Beek Leslie Van
Eisenzopf Reinhard J.
Jones Thomas H.
Manning John R.
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