System and method for communication using orbital angular momentum with multiple layer overlay modulation

• US 9,331,875 B2
• Filed: 07/03/2014
• Issued: 05/03/2016
• Est. Priority Date: 04/04/2014
• Status: Active Grant

• Current Assignee: Nxgen Partners Ip, LLC (NxGen Partners LLC)
• Original Assignee: Nxgen Partners Ip, LLC (NxGen Partners LLC)
• Inventors: Ashrafi, Solyman, Linquist, Roger, Ashrafi, Nima
• Primary Examiner(s): Oveissi, David
• Application Number:
  US14/323,082
• Publication Number:
  US 20150288476A1
• Time in Patent Office: 670 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 10/11 Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
• CPC Class Codes: H04B 10/2575 Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
• CPC Class Codes: H04B 10/2581 Multimode transmission
• CPC Class Codes: H04B 10/50 Transmitters
• CPC Class Codes: H04B 10/5161 Combination of different modulation schemes
• CPC Class Codes: H04B 10/532 Polarisation modulation
• CPC Class Codes: H04B 10/541 Digital intensity or amplitude modulation
• CPC Class Codes: H04J 14/00 Optical multiplex systems
• CPC Class Codes: H04J 14/06 Polarisation multiplex systems
• CPC Class Codes: H04L 2025/0335 characterised by the type of transmission
• CPC Class Codes: H04L 2025/0342 QAM
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 27/3405 Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
• CPC Class Codes: H04L 27/362 Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence
• CPC Class Codes: H04L 27/366 Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
• CPC Class Codes: H04L 63/06 for supporting key management in a packet data network cryptographic mechanisms or cryptographic arrangements for key management H04L9/08
• CPC Class Codes: H04L 9/0858 Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
• CPC Class Codes: H04L 9/3093 involving Lattices or polynomial equations, e.g. NTRU scheme
• CPC Class Codes: H04W 12/041 Key generation or derivation
• CPC Class Codes: H04W 12/0431 : Key distribution or pre-distribution; Key agreement

Abstract

A communications system includes a transmitter for transmitting an optical signal including a plurality of data streams over an optical communications link. The transmitter includes first signal processing circuitry for processing each of the plurality of input data streams to generate a parallel pair of data streams including an in-phase stream (I) and a quadrature-phase stream (Q) for each of the plurality of input data streams. The first signal processing circuitry modulates a first and second parallel pair of data streams with a selected one of at least three mutually orthogonal functions at a first and second signal widths, respectively, to generate a plurality of first data sub-layers and a plurality of second data sub-layers and generates a plurality of composite data stream by overlaying the first data subs-layers with the second data sub-layers at a preconfigured overlay offset. Second signal processing circuitry places the plurality of composite data streams on a wavelength of the optical communications link. Each of the plurality of composite data streams having a different orbital angular momentum associated therewith to enable transmission of each of the plurality of composite data streams on the wavelength at a same time.

Claims

1. A system, comprising:

first signal processing circuitry for transmitting a signal including a plurality of data streams over a link, the first signal processing circuitry further comprising;

first circuitry for processing each of the plurality of input data streams to generate a plurality of parallel pairs of data streams including an in-phase stream (I) and a quadrature-phase stream (Q) for each of the plurality of input data streams,

modulating each of the plurality of parallel pairs of data streams with a selected one of at least three mutually orthogonal functions and each of the plurality of parallel pairs at a different signal width, respectively, to generate a plurality of data signals, each associated with one of the plurality of parallel pairs of data streams, and

generating a plurality of composite data streams by overlaying at least one first data signal of the plurality of data signals in a first data layer with at least one second data signal of the plurality of data signals in a second data layer; and

second circuitry for processing the plurality of composite data streams to associate with each of the plurality of composite data streams a Hermite polynomial to cause each of the plurality of composite data streams to be mutually orthogonal to each other on the link to enable transmission of each of the plurality of composite data streams on the link at a same time.

2. The system of claim 1, wherein the link further comprises a fiber optic link.

3. The system of claim 2, wherein the fiber optic link comprise a multi-mode fiber.

4. The system of claim 1, wherein the link further comprises a free space optics link.

5. The system of claim 1, wherein the link further comprises an RF link.

6. The system of claim 1, further including third circuitry for selecting an encryption key for transmissions over the link using quantum key distribution.

7. The system of claim 1, wherein the at least three mutually orthogonal functions comprises a plurality of time-limited and band-limited functions.

8. The system of claim 1, wherein the at least three mutually orthogonal functions comprises at least one of a plurality of modified Hermite polynomials, Jacobi polynomials, Gegenbauer polynomials, Legendre polynomials, Chebyshev polynomials and Laguerre functions.

9. The system of claim 1, wherein the at least three mutually orthogonal functions comprises a plurality of rectangular, cylindrical, and spherical functions.

10. The system of claim 1, further including second signal processing circuitry for receiving the plurality of composite data streams on the link, the second signal processing circuitry further comprising:

a signal separator for separating each of the plurality of composite data streams having the different Hermite polynomial applied thereto by the second circuitry from each other;

third circuitry for removing the different Hermite polynomial applied thereto by the second circuitry from each of the plurality of composite data streams;

fourth circuitry for demodulating the plurality of composite data streams into the plurality of input data streams.

11. A system, comprising:

first signal processing circuitry for transmitting a signal including a plurality of data streams over a link, the first signal processing circuitry further comprising;

first circuitry for processing each of the plurality of input data streams to generate a plurality of parallel pairs of data streams including an in-phase stream (I) and a quadrature-phase stream (Q) for each of the plurality of input data streams,

modulating each of the plurality of parallel pairs of data streams with a selected one of at least three mutually orthogonal functions and each of the plurality of parallel pairs at a different signal width, respectively, to generate a plurality of data signals, each associated with one of the plurality of parallel pairs of data streams, and

generating a plurality of composite data stream by overlaying at least one first data signal of the plurality of data signals in a first data layer with at least one second data signal of the plurality of data signals in a second data layer; and

second circuitry for processing the plurality of composite data streams to associate with each of the plurality of composite data streams a Hermite polynomial to cause each of the plurality of composite data streams to be mutually orthogonal to each other on the link to enable transmission of each of the plurality of composite data streams on the link at a same time;

second signal processing circuitry for receiving the signal over the link, the second signal processing circuitry further comprising;

third circuitry to extract the plurality of composite data streams having the different Hermite polynomial applied thereto by the second signal processing circuitry associated therewith from link; and

fourth circuitry for demodulating the plurality of composite data streams into the plurality of input data streams.

12. The system of claim 11, wherein the link further comprises at least one of a fiber optic link and RF link.

13. The system of claim 12, wherein the fiber optic link comprise a multi-mode fiber.

14. The system of claim 11, wherein the link further comprises a free space optics link.

15. The system of claim 11, wherein the first signal processing circuitry further includes fifth circuitry for selecting an encryption key for transmissions over the link using quantum key distribution.

16. The system of claim 11, wherein the at least three mutually orthogonal functions comprises at least one of a plurality of time-limited and band-limited functions, rectangular functions, cylindrical functions and spherical functions.

17. The system of claim 11, wherein the at least three mutually orthogonal functions comprises at least one of a plurality of modified Hermite polynomials, Jacobi polynomials, Gegenbauer polynomials, Legendre polynomials, Chebyshev polynomials and Laguerre functions.

18. A method for providing a plurality of input streams from first signal processing circuitry to second signal processing circuitry over a link, comprising:

receiving the plurality of input streams;

processing each of the plurality of input data streams to generate a plurality of parallel pairs of data streams including an in-phase stream (I) and a quadrature-phase stream (Q) for each of the plurality of input data streams;

modulating each of the plurality of parallel pairs of data streams with a selected one of at least three mutually orthogonal functions and each of the plurality of parallel pairs at a different signal width, respectively, to generate a plurality of data signals, each associated with one of the plurality of parallel pairs of data streams, and

generating a plurality of composite data streams by overlaying at least one first data signal of the plurality of data signals in a first data layer with at least one second data signal of the plurality of data signals in a second data layer;

applying Hermite polynomials to each of the plurality of composite data streams to cause each of the plurality of composite data streams to be mutually orthogonal to each other; and

placing the plurality of composite data streams on the link, each of the plurality of composite data streams having the different Hermite polynomial associated therewith to enable each of the plurality of composite data streams on the link at a same time.

19. The method of claim 18, wherein the link further comprises at least one of a fiber optic link and RF link.

20. The method of claim 19, wherein the fiber optic link comprise a multi-mode fiber.

21. The method of claim 18, wherein the link further comprises a free space optics link.

22. The method of claim 18, further including selecting an encryption key for data passed over the link using quantum key distribution.

23. The method of claim 18, wherein the at least three mutually orthogonal functions comprises at least one of a plurality of time-limited and band-limited functions, rectangular functions, cylindrical functions and spherical functions.

24. The method of claim 18, wherein the at least three mutually orthogonal functions comprises a plurality of at least one of modified Hermite polynomials, Jacobi polynomials, Gegenbauer polynomials, Legendre polynomials, Chebyshev polynomials and Laguerre functions.

25. The method of claim 18, further including:

receiving the plurality of composite data streams on the link;

separating each of the plurality of composite data streams having the different Hermite polynomial from each other;

demodulating the Hermite polynomial from each of the plurality of composite data streams; and

demodulating the plurality of composite data streams into the plurality of input data streams.

26. A system, comprising:

first signal processing circuitry for transmitting a signal including a plurality of data streams over a link, the first signal processing circuitry further comprising;

first circuitry for processing each of the plurality of input data streams to generate a plurality of parallel pairs of data streams including an in-phase stream (I) and a quadrature-phase stream (Q) for each of the plurality of input data streams,

modulating each of the plurality of parallel pairs of data streams with a different, selected one of at least three mutually orthogonal functions and each of the plurality of parallel pairs at a different signal width, respectively, to generate a plurality of data signals, each associated with one of the plurality of parallel pairs of data streams, and

generating a plurality of composite data streams by overlaying at least one first data signal of the plurality of data signals in a first data layer with at least one second data signal of the plurality of data signals in a second data layer; and

second circuitry for processing the plurality of composite data streams to associate with each of the plurality of composite data streams an orthogonal function to cause each of the plurality of composite data streams to be mutually orthogonal to each other on the link to enable transmission of each of the plurality of composite data streams on the link at a same time.

27. The system of claim 26, further including third circuitry for selecting an encryption key for transmissions over the link using quantum key distribution.

28. The system of claim 26, wherein the at least three mutually orthogonal functions comprises at least one of a plurality of time-limited and band-limited functions, rectangular functions, cylindrical functions and spherical functions.

29. The system of claim 26, wherein the at least three mutually orthogonal functions comprises at least one of a plurality of modified Hermite polynomials, Jacobi polynomials, Gegenbauer polynomials, Legendre polynomials, Chebyshev polynomials and Laguerre functions.

30. The system of claim 26, further including a second signal processing circuitry for receiving the plurality of composite data streams on the at least one of the link, the second signal processing circuitry for receiving further comprising:

a signal separator for separating each of the plurality of composite data streams having the different orthogonal function from the received signal on the link;

third circuitry for removing the different orthogonal function from each of the plurality of composite data streams;

fourth circuitry for demodulating the plurality of composite data streams into the plurality of input data streams.