Optically reconfigurable conductive line element

• US 5,719,975 A
• Filed: 09/03/1996
• Issued: 02/17/1998
• Est. Priority Date: 09/03/1996
• Status: Expired due to Term

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Inventors: Wolfson, Ronald I., Mullen, Ruth A., Milroy, William W.
• Primary Examiner(s): Ullah, Akm E.
• Application Number:
  US08/711,729
• Time in Patent Office: 532 Days
• Field of Search: 385/39, 385/48, 385/22, 385/23, 385/43, 385/120, 385/116, 385/121, 385/147, 385/142, 385/143, 359/142, 359/180, 359/117, 359/118, 250/227.2
• US Class Current: 385/48
• CPC Class Codes: G02B 6/02 Optical fibres with cladding with or without a coating
• CPC Class Codes: G02B 6/02104 characterised by the coating external to the cladding, e.g. coating influences grating properties
• CPC Class Codes: G02B 6/02195 characterised by means for tuning the grating
• CPC Class Codes: H01Q 3/2676 Optically controlled phased array

Abstract

An optical fiber having a conductive layer disposed therearound has sections removed therefrom that form gaps that expose the underlying optical fiber. Light manifolds are formed at each gap, such as are provided by Bragg gratings photoinduced in the core at each gap, and photoconductive material is disposed at each of the gaps. An opaque coating may optionally be disposed over the outside of the photoconductive material to ensure that it is activated by light propagating within the optical fiber. Light transmitted down the fiber may be controllably coupled output of the fiber at each of the gaps. The optical fiber thus provides multiple functions including electrical conductor, light manifold, and substrate on which the photoconductive material is deposited.

Claims

1. An optically reconfigurable conductive line element comprising:

an optical fiber having a core and a conductive layer disposed therearound, and wherein a plurality of sections are removed from conductive layer to form gaps therein to expose the underlying optical fiber;

a light source for injecting light into the optical fiber;

a light manifold formed in the optical fiber at each gap, which taps off a portion of the light that is injected into and propagates down the optical fiber; and

photoconductive material disposed in each of the gaps in the conductive layer.

2. The conductive line element of claim 1 wherein the light manifold comprises a Bragg grating photoinduced in the core of the optical fiber at each gap, which grating taps off a portion of the light that is injected into and propagates down the optical fiber.

3. The conductive line element of claim 1 wherein the light manifold comprises a light diffuser formed by scuffing the surface of the optical fiber at each gap, which taps off a portion of the light that is injected into and propagates down the optical fiber.

4. The conductive line element of claim 1 wherein the optical fiber comprises a plastic optical fiber and wherein the light manifold comprises a light diffuser formed by scuffing the surface of the optical fiber at each gap, which taps off a portion of the light that is injected into and propagates down the optical fiber.

5. The conductive line element of claim 1 wherein the photoconductive material comprises a switching device.

6. The conductive line element of claim 5 wherein the switching device comprises a photovoltaic field effect transistor.

7. The conductive line element of claim 1 wherein the conductive layer comprises a metal jacket.

8. The conductive line element of claim 2 wherein the metal jacket comprises aluminum.

9. The conductive line element of claim 1 further comprising:

an opaque coating disposed over the outside of the photoconductive material to ensure that it is activated only by light propagating within the optical fiber.

10. The conductive line element of claim 1 wherein the optical fiber comprises glass.

11. The conductive line element of claim 1 wherein the optical fiber comprises plastic.

12. An optically reconfigurable conductive line element comprising:

an optical fiber having a core and a conductive layer disposed therearound, and wherein a plurality of sections are removed from conductive layer to form gaps therein to expose the underlying optical fiber;

a light source for injecting light into the optical fiber;

a Bragg grating 4 photoinduced in the core of the optical fiber at each gap, which grating taps off a portion of the light that is injected into and propagates down the optical fiber;

photoconductive means disposed in each of the gaps in the conductive layer; and

an opaque coating disposed over the outside of the photoconductive means to ensure that it is activated only by light propagating within the optical fiber.

13. The conductive line element of claim 12 wherein the photoconductive means comprises photoconductive material.

14. The conductive line element of claim 12 wherein the photoconductive means comprises a switching device.

15. The conductive line element of claim 14 wherein the switching device comprises a photovoltaic field effect transistor.

16. The conductive line element of claim 12 wherein the conductive layer comprises a metal jacket.

17. The conductive line element of claim 16 wherein the metal jacket comprises aluminum.

18. The conductive line element of claim 12 wherein the optical fiber comprises glass.

19. The conductive line element of claim 12 wherein the optical fiber comprises plastic.