Direction finding apparatus using tunable fiber optic delay line

Details Direction finding apparatus using tunable fiber optic delay line Direction finding apparatus using tunable fiber optic delay line

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:
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patent: 3991417 (1976-11-01), Levine
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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.

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