Generating an image using an active optical interference system

• US 9,267,782 B1
• Filed: 10/01/2013
• Issued: 02/23/2016
• Est. Priority Date: 11/29/2012
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Capron, Barbara A., Parazzoli, Claudio G.
• Primary Examiner(s): Lyons, Michael A
• Assistant Examiner(s): Prieto, Violeta A
• Application Number:
  US14/043,202
• Time in Patent Office: 875 Days
• US Class Current: 1/1
• CPC Class Codes: G01B 2290/45 Multiple detectors for detecting interferometer signals
• CPC Class Codes: G01B 2290/55 Quantum effects
• CPC Class Codes: G01B 9/02027 Two or more interferometric channels or interferometers
• CPC Class Codes: G01B 9/02028 Two or more reference or object arms in one interferometer
• CPC Class Codes: G01B 9/02041 characterised by particular imaging or detection techniques
• CPC Class Codes: G02B 27/58 Optics for apodization or superresolution; Optical synthetic aperture systems
• CPC Class Codes: H04B 10/70 Photonic quantum communication

Abstract

A system may include a synthetic optical aperture configured to receive a plurality of received photon beams comprising a scene including an object. The system may also include an active optical interference system configured to interfere each of the plurality of received photon beams from the synthetic optical aperture with a corresponding source photon beam of a plurality of source photon beams. The active optical interference system may generate a plurality of enhanced interference beams. Each enhanced interference beam includes at least a predetermined gain. The system may further include a detector system configured to detect the plurality of enhanced interference beams and generate an electrical output signal for use in generating a reconstructed image of the object with improved resolution responsive to at least the predetermined gain of the enhanced interference beams.

Claims

1. A system, comprising:

a synthetic optical aperture configured to receive a plurality of received photon beams comprising a scene including an object;

an active optical interference system configured to interfere each of the plurality of received photon beams from the synthetic optical aperture with a corresponding source photon beam of a plurality of source photon beams, the active optical interference system generating a plurality of enhanced interference beams, each enhanced interference beam comprising at least a predetermined increase in gain; and

a detector system configured to detect the plurality of enhanced interference beams and generate an electrical output signal for use in generating a reconstructed image of the object with improved resolution responsive to at least the predetermined increase in gain of the enhanced interference beams.

2. The system of claim 1, wherein the active optical interference system comprises a plurality of active optical interference devices, each active optical interference device comprising:

a first optical amplifier, the first optical amplifier configured to receive at least one of the plurality of received photon beams and the corresponding source photon beam, the first optical amplifier generating at least a first interference beam and a second interference beam; and

a second optical amplifier, the second optical amplifier configured to combine at least the first interference beam and the second interference beam and generate at least a first enhanced interference beam and a second enhanced interference beam;

the detector system comprising;

a first detector configured to receive the first enhanced interference beam and to generate a first electrical signal corresponding to the first enhanced interference beam; and

a second detector configured to receive the second enhanced interference beam and generate a second electrical signal corresponding to the second enhanced interference beam, the first electrical signal and the second electrical signal are combinable with first and second electrical signals from other active optical interference devices of the plurality of active optical interference devices for use in generating the reconstructed image of the object.

3. The system of claim 2, further comprising a controllable optical pump that is controlled to pump a chosen number of photons in a pump photon beam into the first optical amplifier, a total number of photons at an output of the active optical interference device corresponds to the chosen number of photons pumped into the first optical amplifier and a phase shift of a pumped output photon beam from the first optical amplifier determines an amount of gain in the second optical amplifier.

4. The system of claim 3, wherein the controllable optical pump is controlled to generate the pumped output photon beam comprising a phase shift of pi which provides a maximum gain in the active optical interference device.

5. The system of claim 2, further comprising a differentiator configured to receive at least the first electrical signal and the second electrical signal and to generate an output signal useable in generating the reconstructed image of the object.

6. The system of claim 2, wherein each active optical interference device further comprises:

a first mirror to reflect the first interference beam from the first optical amplifier to the second optical amplifier; and

a second mirror to reflect the second interference beam from the first optical amplifier to the second optical amplifier.

7. The system of claim 1, further comprising:

a photon source configured to emit a photon beam comprising a known number of source photons; and

a beam splitter configured to split the photon beam from the photon source into the plurality of source photon beams, wherein the active optical interference system comprises a plurality of active optical interference devices, one source photon beam is directed by the beam splitter to a respective one of the plurality of active optical interference devices.

8. The system of claim 7, wherein the photon source comprises one of a classical coherent photon source and a non-classical photon source.

9. The system of claim 7, wherein the corresponding source photon beam comprises a predetermined number of photons that is larger than the number of photons of the received photon beam with which the corresponding source photon beam is interfered.

10. The system of claim 1, wherein the synthetic optical aperture comprises a plurality of optical apertures distributed in a predetermined pattern.

11. The system of claim 10, wherein the active interference system is configured to measure a relative phase between the received photon beam received by each optical aperture of the plurality of optical apertures of the synthetic optical aperture and the corresponding source photon beam.

21. The system of claim 1, wherein the synthetic optical aperture is configured to receive the plurality of received photon beams comprising the scene including the object, the scene including the object being in a far-field region.

22. The system of claim 21, wherein the far-filed region is greater than twice a baseline squared divided by a wavelength of photons in the photon beams from the scene, the baseline being a distance between each of a plurality of optical apertures of the synthetic optical aperture.

12. A system, comprising:

a photon source configured to emit source photons having a non-classical state, wherein the source photons are configured to be distributed as a plurality of source photon beams in which fluctuations in a number of photons of each of the plurality of source photon beams is reduced to within a predetermined tolerance; and

a sensor system configured to receive a plurality of photon beams comprising a scene including an object through a synthetic optical aperture, the sensor system comprising an active interference system that interferes each of the plurality of photon beams from the synthetic optical aperture with a corresponding source photon beam of the plurality of source photon beams to form a plurality of enhanced interference beams and generates an output signal based on the plurality of enhanced interference beams, wherein the output signal is configured for use in generating an image of the scene.

13. The system of claim 12, wherein the photon source is configured to control the number of photons in each of the plurality of source photon beams and the active interference system mixes each of the plurality of photon beams comprising the scene with the corresponding source photon beam causing a reduction in a phase variance between the plurality of photon beams that is enhanced by the active interference system by the output signal comprising a predetermined gain.

14. A method, comprising:

receiving a plurality of photon beams through a synthetic optical aperture, the plurality of photon beams comprising a scene including an object;

interfering each of the plurality of photon beams from the synthetic optical aperture with a corresponding source photon beam of a plurality of source photon beams in an active optical interference system to form a plurality of enhanced interference beams, each of the plurality of enhanced interference beams comprising at least a predetermined increase in gain and phase variance with respect to other enhanced interference beams of the plurality of enhanced interference beams; and

forming an output signal based on the plurality of enhanced interference beams, wherein the output signal is configured for use in generating an image of the object.

15. The method of claim 14, wherein the synthetic optical aperture comprises a plurality of optical apertures distributed in a pattern.

16. The method of claim 15, further comprising measuring a relative phase between each of the plurality of photon beam received by each optical aperture of the plurality of optical apertures and the corresponding source photon beam for generating the image of the scene.

17. The method of claim 14, further comprising:

generating a plurality of source photons comprising a non-classical state; and

distributing the plurality of source photons as the plurality of source photon beams.

18. The method of claim 14, wherein interfering each of the plurality of photon beams and the corresponding source photon beams comprises:

receiving by a first optical amplifier of an active optical interference device at least one of the plurality photon beams and the corresponding source photon beam, the first optical amplifier generating at least a first interference beam and a second interference beam; and

combining by a second optical amplifier of the active optical interference device is at least the first interference beam and the second interference beam and generating at least a first enhanced interference beam and a second enhanced interference beam.

19. The method of claim 18, further comprising:

detecting by a first detector the first enhanced interference beam;

generating a first electrical signal corresponding to the first enhanced interference beam;

detect by a second detector the second enhanced interference beam;

generating a second electrical signal corresponding to the second enhanced interference beam; and

combining the first electrical signal and the second electrical signal with first and second electrical signals from other active optical interference devices of a plurality of active optical interference devices of the active optical interference system for use in generating a reconstructed image of the object.

20. The method of claim 18, further comprising controlling a number photons pumped into the first optical amplifier by an optical pump, a total number of photons at an output of the active optical interference device corresponds to a chosen number of photons pumped into the first optical amplifier and a phase shift of a pumped output photon beam from the first optical amplifier determines an amount of gain in the second optical amplifier.