Optical waveguides – With optical coupler – Plural
Patent
1995-02-23
1996-06-25
Ullah, Akm E.
Optical waveguides
With optical coupler
Plural
25022712, 356350, G02B 628
Patent
active
055307787
ABSTRACT:
A direction finding apparatus and method for an RF signal are described which provide a variable time delay in fiber optic cables. A tunable transmitter launches optical emissions of several wavelengths into a plurality of fiber optic cables. Since the waveguide material of each cable exhibits anomalous dispersion of the optical emissions, large changes in group refractive index are provided as a function of the different wavelengths of the optical emissions. As a consequence, only small changes in the different wavelengths of the optical emissions produce large changes in the time delay of the different wavelengths of the optical emissions within a fixed length of the optical fiber cables. This apparatus and method produce sensitive angle of arrival determinations for RF signals.
REFERENCES:
patent: 3988614 (1976-10-01), Kapron et al.
patent: 3991417 (1976-11-01), Levine
patent: 4164373 (1979-08-01), Schuss
patent: 4671604 (1987-06-01), Soref
patent: 4671605 (1987-06-01), Soref
patent: 5101455 (1992-03-01), Goutzoulis
"A Fiber-Optics Matched Delay Filter for RF Direction Finding"; Journal of ightwave Technology, vol. LT-3, No. 2, Apr. 1985.
NOSC-TR 1161, "Ultra-Wideband Direction Finding Using Fiber Optic Transversal Filters", S. A. Pappert, Mar. 1987.
"Fiber-Optic Delay Line Technology For Wideband Signal Processing", S. A. Pappert, Optical Electronics Branch, Naval Ocean Systems Center (No Date).
"Ultra-wideband direction finding using a fiber optic beamforming Processor", Stephen A. Pappert, Naval Ocean Systems Center, San Diego, Ca (No Date).
"A Fiber-Optics Matched Delay Filter For RF Direction Finding", Journal of Lightwave Technology, vol. LT-3, No. 2, Apr. 1985.
"A Fiber Optic Beamforming Processor For Wideband Direction Finding", Stephen A. Pappert, Naval Ocean Systems Center, San Diego, CA (No Date).
NOSC-TR 1161, "Ultra-Wideband Direction Finding Using Fiber Optic Transversal Filters", S. A. Pappert, Mar. 1987.
Keough Glenn
The United States of America as represented by the Secretary of
Thomas Harvey Fendelman
Ullah Akm E.
Whitesell Eric James
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