Opto-electronic ultra-wideband signal waveform generator and radiator

• US 20030202794A1
• Filed: 09/25/2002
• Published: 10/30/2003
• Est. Priority Date: 04/24/2002
• Status: Active Grant

• Current Assignee: HRL Laboratories LLC (The Boeing Co.)
• Original Assignee: HRL Laboratories LLC (The Boeing Co.)
• Inventors: Izadpanah, Hossein, Sayyah, Keyvan, Lynch, Jonathan, Mokhtari, Mchran
• Granted Patent: US 7,020,396 B2
• Time in Patent Office: Days
• US Class Current: 398/115
• CPC Class Codes: H01Q 13/065 provided with a flange or a choke
• CPC Class Codes: H01Q 3/2676 Optically controlled phased array
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 5/42 using two or more imbricated arrays H01Q5/49 takes precedence
• CPC Class Codes: H04B 1/71635 Transmitter aspects H04B1/7174 takes precedence
• CPC Class Codes: H04B 10/25752 Optical arrangements for wireless networks
• CPC Class Codes: H04B 2210/006 Devices for generating or processing an RF signal by optical means
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems

Abstract

A method and apparatus for generating an arbitrary UWB waveform are presented. An optical comb generator generates a serial stream of optical tones and an optical beating tone. A serial-to-parallel converter receives the serial tones and converts them into parallel optical tones. A spatial light modulator receives the parallel optical tones, and independently adjusts at least one of the phase and amplitude of each to generate the components of an arbitrary waveform. Next, each one of a plurality of optical-to-electrical converters receives a parallel optical tone and the selected optical beating tone, which are beat with the optical beating tone, producing electrical notes, representing differences between each parallel optical tones and the optical beating tone. Each antenna element is connected to receive an electrical note and to launch a signal based thereon, such that the launched signals are superimposed to the arbitrary waveform signal.

Claims

1. An apparatus for generating an arbitrary ultra-wideband waveform, the apparatus comprising components including:

an optical comb generator for generating a serial stream of optical tones, one of which is selected as an optical beating tone;

a serial-to-parallel converter connected with the optical comb generator for receiving the serial optical tones therefrom and for converting the serial optical tones into a plurality of parallel optical tones, each having a phase and an amplitude;

a spatial light modulator connected with the serial-to-parallel converter for receiving the parallel optical tones, and for independently adjusting at least one of the phase and amplitude of each of the parallel optical tones to generate the constituent components of an arbitrary waveform;

a plurality of optical-to-electrical converters, each connected to receive one of the parallel optical tones and the optical beating tone and to beat the respective parallel optical tone with the optical beating tone, the plurality of optical-to-electrical converters thus producing a plurality of electrical notes, with each electrical note representing the difference between the parallel optical tone and the optical beating tone; and

at least one transmitter array including a plurality of antenna elements, with each antenna element connected to receive an electrical note and to launch a signal based on the electrical note, with the plurality of electrical notes being launched by the at least one transmitter array such that a sum of the launched signals form a superimposed signal in free space, forming a user-determinable arbitrary waveform.

2. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 1, wherein the at least one transmitter array is selected from a group consisting of radio-frequency transmitters and infrared transmitters.

3. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 2, wherein the optical comb generator is a device generating an optical multi-spectra comb, with the comb optical tones being locked in phase.

4. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 2, wherein the optical comb generator is selected from a group consisting of mode locked lasers and phase-locked multi-tone photonic oscillators.

5. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 1, wherein the optical comb generator is a device generating an optical multi-spectra comb, with the comb optical tones being locked in phase.

6. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 1, wherein the optical comb generator is selected from a group consisting of mode locked lasers and phase-locked multi-tone photonic oscillators.

7. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 1, wherein the serial-to-parallel converter is a device selected from a group consisting of optical dispersive gratings, array waveguide gratings, and an array of laser diodes where each laser diode is optically injection-locked to an individual serial tone from the optical comb generator.

8. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 7, wherein the optical comb generator is a device generating an optical multi-spectra comb, with the comb optical tones being locked in phase.

9. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 7, wherein the optical comb generator is selected from a group consisting of mode locked lasers and phase-locked multi-tone photonic oscillators.

10. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 7, wherein the at least one transmitter array is selected from a group consisting of radio-frequency transmitters and infrared transmitters.

11. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 10, wherein the optical comb generator is a device generating an optical multi-spectra comb, with the comb optical tones being locked in phase.

12. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 10, wherein the optical comb generator is selected from a group consisting of mode locked lasers and phase-locked multi-tone photonic oscillators.

13. An apparatus for generating an arbitrary ultra-wideband waveform as set forth in claim 1, wherein the components of the apparatus are fabricated onto a hybrid circuit board.

14. A method for generating an arbitrary ultra-wideband waveform, the apparatus comprising the steps of:

generating a serial stream of optical tones, one of which is selected as an optical beating beating tone;

converting the serial optical tones into a plurality of parallel optical tones, each having a phase and an amplitude;

independently adjusting at least one of the phase and amplitude of each of the parallel optical tones to generate the constituent components of an arbitrary waveform;

beating each optical tone with the optical beating tone to produce a plurality of electrical notes, with each electrical note representing the difference between the respective optical tone and the optical beating tone; and

launching a signal based on each electrical note such that a sum of the launched signals forms a superimposed signal in free space, forming a user-determinable arbitrary waveform.

15. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 14, wherein the launching step is performed by use of a plurality of arrays of transmitters selected from a group consisting of radio-frequency transmitters and infrared transmitters.

16. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 15, wherein the generating step is performed by generating an optical multi-spectra comb, with the comb optical tones being locked in phase.

17. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 15, wherein the generating step is performed by use of an optical comb generator selected from a group consisting of mode locked lasers and phase-locked multi-tone photonic oscillators.

18. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 14, wherein the generating step is performed by generating an optical multi-spectra comb, with the comb optical tones being locked in phase.

19. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 14, wherein the generating step is performed by use of an optical comb generator selected from a group consisting of mode locked lasers and phase-locked multi-tone photonic oscillators.

20. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 14, wherein the serial-to-parallel converting step is performed by use of a device selected from a group consisting of optical dispersive gratings, array waveguide gratings, and an array of laser diodes where each laser diode is optically injection-locked to an individual serial tone from the optical comb generator.

21. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 20, wherein the generating step is performed by generating an optical multi-spectra comb, with the comb optical tones being locked in phase.

22. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 20, wherein the generating step is performed by use of an optical comb generator selected from a group consisting of mode locked lasers and phase-locked multi-tone photonic oscillators.

23. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 20, wherein the launching step is performed by use of a plurality of arrays of transmitters selected from a group consisting of radio-frequency transmitters and infrared transmitters.

24. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 23, wherein the generating step is performed by generating an optical multi-spectra comb, with the comb optical tones being locked in phase.

25. A method for generating an arbitrary ultra-wideband waveform as set forth in claim 23, wherein the generating step is performed by use of an optical comb generator selected from a group consisting of mode locked lasers and phase-locked multi-tone photonic oscillators.