Fiber optical discrete phase modulation system
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United States of America Patent
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Feb 16, 1988
Issued Date -
N/A
app pub date -
May 1, 1987
filing date -
Jun 27, 1985
priority date (Note) -
Expired
status (Latency Note)
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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.
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