Integrated circuit photonic signal matrix

• US 20020071629A1
• Filed: 12/13/2001
• Published: 06/13/2002
• Est. Priority Date: 12/13/2000
• Status: Active Grant

• Current Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Original Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Inventors: Gomes, David W., Sundaram, Mani, Ahearn, John S.
• Granted Patent: US 6,493,483 B2
• Time in Patent Office: Days
• US Class Current: 385/17
• CPC Class Codes: G02B 2006/12107 Grating
• CPC Class Codes: G02B 6/29323 Coupling to or out of the diffractive element through the lateral surface of the light guide evanescent grating couplers G02B6/29332
• CPC Class Codes: G02B 6/4215 the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers G02B6/4246 takes precedence
• CPC Class Codes: G02B 6/43 Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0058 Crossbar; Matrix

Abstract

A signal matrix provides high speed interconnections using optoelectronic elements by detecting wavelength dependent photonic signals at each element of a matrix and re-emitting the detected photonic signals for transmission to an intended destination. Applications include telecommunications and computing, and particularly, cross bar switches and fiber optic bundles.

Claims

1. An optoelectronic signal matrix for selectively connecting any of N inputs to any of M outputs, comprising:

an integrated circuit matrix having N rows by M columns of optoelectronic matrix elements, with each matrix element including a detector and emitter pair adapted to detect first photonic signals and to re-emit the detected first photonic signals as second photonic signals;

one or more input emitters for each N input, adapted to transmit a first photonic signal along a separate respective N matrix row, wherein the first photonic signals transmitted thereby have one or more wavelengths corresponding to one or more respective M outputs;

one or more output detectors for each M output, adapted to receive second photonic signals from a separate respective matrix column;

a waveguide located adjacent the matrix and adapted to provide a transmission medium along individual rows and along individual columns of the matrix;

a separate diffraction grating associated with the waveguide over each detector of each matrix element and adapted to provide wavelength dependent diffraction of the first photonic signals traveling in the waveguide along each N row into the matrix element detector of wavelength respective M columns; and

a separate optical distribution element associated with the waveguide over each emitter of each matrix element and adapted to distribute second photonic signals emitted from each matrix element emitter into the waveguide and along the respective M column;

wherein the signal matrix is adapted to receive signals at each N input intended for any M output, transmit the received signals through the waveguide as first photonic signals at a wavelength corresponding to the intended M output, diffract the transmitted first photonic signals for detection by the matrix element of the corresponding M column, re-emit the detected signal from the detecting matrix element as a second photonic signal, distribute the second photonic signal into the respective M column and detect the distributed second photonic signal at the respective M output detector.

2. The signal matrix of claim 1, wherein each of the matrix element emitters in an M column uses a separate photonic wavelength corresponding to a separate N input.

3. The signal matrix of claim 1, wherein the first photonic signals include multiple separate signals each having a separate wavelength corresponding to a separate M output.

4. The signal matrix of claim 1, wherein the integrated circuit matrix includes ASIC circuits adapted for driving each of the emitters and detectors of the integrated circuit matrix elements and for coupling detected signals between the detector and emitter of each matrix element.

5. The signal matrix of claim 1, wherein the integrated circuit matrix is substantially planar.

6. The signal matrix of claim 5, wherein the waveguide includes partial blinds formed from photon absorbing material, and further wherein such blinds are adapted to aid channeling of the first and second photonic signals and to reduce stray photonic signals between different rows and columns of the planar integrated circuit matrix.

7. The signal matrix of claim 6, wherein the rows and columns of the matrix are substantially orthogonal.

8. The signal matrix of claim 5, wherein the diffraction gratings and scattering elements are formed in the waveguide, and further wherein the waveguide is affixed to the planar integrated circuit matrix.

9. A method for connecting electrical signals from any one of N inputs to anyone of M outputs, comprising:

emitting a first photonic signal representing an electrical signal from an N input at a photonic wavelength corresponding to an intended M output;

conveying the emitted first photonic signal adjacent a separate row of an integrated circuit matrix of N rows by M columns of optoelectronic matrix elements;

detecting the conveyed first photonic signal at a matrix element corresponding to the intended M output;

re-emitting the detected first photonic signal as a second photonic signal from the corresponding matrix element;

conveying the re-emitted second photonic signal along the respective M column; and

detecting the conveyed second photonic signal in the respective M column at the respective M output.

10. The method of claim 9, wherein both steps of conveying include passing the first and second photonic signals through a waveguide located adjacent the matrix.

11. The method of claim 10, wherein the step of conveying the emitted first photonic signal includes diffracting the first photonic signal according to photonic wavelength from the waveguide into the matrix element corresponding to the intended M output.

12. The method of claim 11, wherein the step of conveying the re-emitted second photonic signal includes scattering the re-emitted second photonic signal into the waveguide along the respective M column;

13. The method of claim 12, wherein the step of re-emitting the first photonic signal as a second photonic signals includes using a separate wavelength corresponding to each N input.

14. The method of claim 13, wherein the step of re-emitting the detected first photonic signal includes coupling the detected signal between a detector and an emitter of the respective matrix element.

16. The switch matrix of claim 15, wherein the optical elements include wavelength specific diffraction gratings located along one or more matrix rows and adapted to direct photonic signals present within the waveguide into matrix element detectors along the matrix rows;

18. The signal matrix of claim 17, wherein the optical elements include scattering elements located along one or more matrix rows and adapted to direct photonic signals along the waveguide from the emitters of the matrix elements along the matrix rows.

15. An optoelectronic signal matrix for sending input photonic signals over a fiber optic bundle, comprising:

an integrated circuit matrix having at least N rows of optoelectronic matrix elements, with each matrix element including a detector and emitter pair adapted to detect input photonic signals and to re-emit the detected input photonic signals;

a waveguide located adjacent the matrix and adapted to provide a transmission medium along individual rows of the matrix, the waveguide including optical elements for directing input photonic signals into the matrix element detectors from the waveguide; and

means for coupling re-emitted photonic signals from the matrix element emitters into a fiber optic bundle;

wherein the switch matrix is adapted to detect input photonic signals in the waveguide at each matrix element and re-emit the detected input photonic signals into the optical fiber bundle.

17. An optoelectronic signal matrix for receiving photonic signals from a fiber optic bundle, comprising:

a integrated circuit matrix having at least N rows of optoelectronic matrix elements, with each matrix element including a detector and emitter pair adapted to detect photonic signals and to re-emit the detected photonic signals;

means for coupling photonic signals from the fiber optic bundle to the matrix element detectors; and

a waveguide located adjacent the matrix and adapted to provide a transmission medium along individual rows of the matrix, the waveguide including optical elements for directing optical signals along the waveguide from the matrix elements emitters;

wherein the signal matrix is adapted to detect photonic signals present in the fiber optic bundle and to re-emit these detected photonic signals into the waveguide.