Optical waveguides – With optical coupler – Plural
Patent
1996-03-28
1998-08-11
Palmer, Phan T.H.
Optical waveguides
With optical coupler
Plural
385 37, 385 46, 359130, G02B 628
Patent
active
057939071
ABSTRACT:
A two dimensional encoded filter for providing wavelength and time shifted output signals is comprised of a photonic integrated device in which the input signal is optically demultiplexed into a plurality of wavelength components, fed back on optically time-delayed feedback paths to a multiplexer which reassembles the signal into a true-time delay wavelength shifted output. The photonic demultiplexer and multiplexer are comprised of a first optical star coupler having a plurality of inputs in which the center input is provided with the input signal. The first star coupler transmits the input signal across a phased array waveguide grating to a second star coupler across which the waveguide components are demultiplexed. The demultiplexed waveguide components are then fed back along feedback loops of differing length to obtain predetermined increments of time delay into the first star coupler from whence the time-delayed fed back signals are multiplexed into the center output of the second star coupler as the time delayed wavelength components of the output signal.
REFERENCES:
patent: 5367586 (1994-11-01), Glance et al.
LJ Lembo et al., "Low-Loss Fiber Optic Time-Delay Element for Phased-Array Antennas," SPIE 194/1450-6/94 vol. 2155, pp. 13-23.
Richard Sorel, "Optical dispersion technique for time-delay beam steering," Applied Optics 10 Dec. 1992/vol. 31 No. 35 pp. 7395-7397.
Goutzoulis et al.; Hardware-compressive 2-D fiber optic delay line architecture for time steering of phase array antennas, ApOp 20 Dec. 1990, vol. 29, No. 36, pp. 5353-5359.
C.T. Sullivan et al.; Switched Time delay elements based on AlGaAs optical waveguide technology at 1.32 um for optically controlled phased array antennas; SPIE vol. 1703 (1992) 264-271.
GA Magel et al.; "Phosphosilicate Glass waveguides for phased-array radar time delay," SPIE vol. 1703 (1992) pp. 373-378.
Willie Ng et al.; The First Demonstration of an Optically Steered Microwave Phased Array Antenna Using True-Time Delay Journal of Lightwave Technology vol. 9, No. 9 IEEE 1991 pp. 1124-1131.
Jalali Bahram
Yegnanarayanan Sivasubramaniam S.
Dawes Daniel L.
Palmer Phan T.H.
The Regents of the University of California
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