Fiber optical discrete phase modulation system

Details Fiber optical discrete phase modulation system Fiber optical discrete phase modulation system

1987-05-01

1988-02-16

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

342375, H01Q 326

Patent

active

047258446

ABSTRACT:
A technique for applying selected phase delays to an optical carrier signal, the phase delays being referenced to a radio-frequency (rf) subcarrier signal. The optical signal to be phase delayed is introduced into a phase delay network comprising multiple optical paths and multiple electro-optical switches, controllable by signals generated in switching logic. The selected delays can be introduced for purposes of data modulation, or for steering an antenna beam in a phased-array antenna. As applied to the phased-array antenna system, the invention includes a data modulator, a series of star couplers for splitting the optical carrier into multiple elemental carriers, and multiple phase shifters for applying selected phase shifts to the elemental carrier signals, to effect antenna beam steering.

REFERENCES:
patent: 3878520 (1975-04-01), Wright et al.
patent: 4028702 (1977-06-01), Levine
patent: 4079379 (1978-03-01), Piesinger
patent: 4238797 (1980-12-01), Shreve
patent: 4258363 (1981-03-01), Bodmer et al.
patent: 4520362 (1985-05-01), Charlot
Levine, Use of Fiber Optic Frequency and Phase Determining Elements in Radar, 5/79, pp. 436-443.

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