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 Title: |
US5793907:
Method and apparatus for a wavelength selective true-time delay for an optically controlled device
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Jalali, Bahram; Los Angeles, CA
Yegnanarayanan, Sivasubramaniam S.; Los Angeles, CA
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| Assignee: |
The Regents of the University of California, Oakland, CA
other patents from UNIVERSITY OF CALIFORNIA, THE REGENTS OF (599425) (approx. 4,840)
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| Published / Filed: |
1998-08-11
/ 1996-03-28
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| Application Number: |
US1996000625574
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| IPC Code: |
Advanced:
G02B 6/28;
G02B 6/34;
Core:
more...
IPC-7:
G02B 6/28;
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| ECLA Code: |
G02B6/28B14; G02B6/34B4B;
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| U.S. Class: |
Current:
385/024;
385/037;
385/046;
398/087;
Original:
385/024;
385/037;
385/046;
359/130;
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| Field of Search: |
385/024,27,37,46,39
359/113,114,130
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| Priority Number: |
| 1996-03-28 |
US1996000625574 |
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| 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.
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| Attorney, Agent or Firm: |
Dawes, Daniel L. ;
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| Primary / Asst. Examiners: |
Palmer, Phan T.H.;
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| Maintenance Status: |
CC Certificate of Correction issued
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 20 claims |
We claim:
1. An apparatus including a phased array waveguide grating comprising:
- a primary input of said phased array waveguide grating for receiving an input signal having a plurality of wavelength components;
- a primary output of said phased array waveguide grating for outputting a plurality of temporally spaced output signals corresponding to said plurality of wavelength components;
- a plurality of input and output feedback ports of said phased array waveguide grating, said input signal being demultiplexed in said phased array waveguide grating, said input signal on said primary input being demultiplexed into said plurality of wavelength components by said phased array waveguide grating to said output feedback ports, each one of said plurality of output feedback ports receiving one of said wavelength components of said signal; and
- a corresponding plurality of feedback paths provided from said output feedback ports to said input feedback ports, each of said feedback paths having a different path length to introduce correspondingly different time delays into each of said wavelength components, said fedback wavelength components being multiplexed by said same phased array waveguide grating and delivered to said primary output port,
- wherein said a primary input, primary output, plurality of input and output feedback ports and corresponding plurality of feedback paths form a symmetric passive phased array waveguide grating characterized by reciprocity, and wherein said phased array waveguide grating is vertically symmetric thereby permitting said corresponding input and output ports to be functionally interchangeable,
- whereby true-time delay separation of said wave components is obtained in said output signal.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 37 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
DERABS G98-456586
DERG98-456586
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| Other References: |
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.
(7 pages)
Cited by 2 patents
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.
(8 pages)
Cited by 6 patents
[ISI abstract]
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