Coupling of optical interconnect with electrical device

• US 7,684,663 B2
• Filed: 12/29/2008
• Issued: 03/23/2010
• Est. Priority Date: 11/02/2007
• Status: Active Grant

• Current Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Original Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Inventors: Deane, Peter
• Primary Examiner(s): Le; Uyen-Chau N
• Assistant Examiner(s): Chu; Chris H
• Application Number:
  US12/345,487
• Publication Number:
  US 20090129786A1
• Time in Patent Office: 449 Days
• Field of Search: None
• US Class Current: 385/14
• CPC Class Codes: G02B 6/4214 the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device 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: H05K 1/0274 Optical details, e.g. printed circuits comprising integral optical means H05K1/0269 takes precedence; coupling light guides with opto-electronic components G02B6/42
• CPC Class Codes: H05K 1/0393 Flexible materials H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups

Abstract

One embodiment of the present invention includes a flexible interconnect assembly that can convert between optical and electrical signals and that is configured to be easily secured to an electrical device, such as a printed circuit board or integrated circuit chip. The flexible interconnect assembly includes a flexible substrate and one or more optical waveguides that are mounted on the flexible interconnect and suitable for transmitting optical signals. One or more conversion devices for converting between electrical and optical signals are arranged on the flexible substrate. The flexible interconnect assembly optionally includes an attachment fixture that enables the flexible substrate to be reversibly coupled to an attachment apparatus. Particular embodiments of the present invention involve methods, devices and systems for using a flexible interconnect assembly with one or more electronic substrates configured with an attachment apparatus.

Claims

1. A flexible interconnect assembly for transmitting data, the assembly comprising:

a flexible substrate;

at least one optical waveguide suitable for transmitting optical signals, the at least one waveguide mounted onto the flexible substrate;

an attachment fixture to enable the flexible interconnect assembly to be reversibly coupled to an attachment apparatus; and

first and second interfaces situated at first and second ends of the flexible interconnect assembly respectively, each interface comprising;

an interface substrate;

a header substrate mounted on the interface substrate;

one or more conversion devices embedded within the interface and positioned on the header substrate, the one or more conversion devices in optical alignment with the optical waveguide and configured to convert between electrical and optical signals and arranged such that all conversion between optical and electrical signals performed at the flexible interconnect assembly takes place only in the interfaces at the ends of the flexible interconnect assembly;

a plurality of electrically conductive traces, ones of the conductive traces electrically connected with associated ones of the one or more conversion devices; and

a plurality of exposed electrical contacts that are formed on the exterior of the interface, ones of the exposed electrical contacts being electrically connected with ones of the conversion devices via ones of the electrically conductive traces, the plurality of exposed contacts arranged to be coupled with an electrical device external to the flexible interconnect assembly.

2. The flexible interconnect assembly of claim 1, wherein the at least one optical waveguide has a core pitch of at least 20 microns.

3. The flexible interconnect assembly of claim 1, wherein the at least one waveguide includes at least one core, each one of the at least one core having a diameter ranging between approximately 8 to 10 microns.

4. The flexible interconnect assembly of claim 1, wherein the at least one waveguide includes at least one core configured with a core width of at least 8 microns.

5. A flexible interconnect assembly recited as in claim 1, wherein:

the one or more conversion devices of the first interface enables at least one of;

receiving an optical signal from the at least one waveguide and converting it to an electrical signal or receiving an electrical signal from a first electrical input and converting it to an optical signal for transmission through the at least one waveguide; and

the one or more conversion devices of the second interface enable at least one of;

receiving an optical signal from the at least one waveguide and converting it to an electrical signal or receiving an electrical signal from a second electrical input and converting it to an optical signal for transmission through the at least one waveguide.

6. A flexible interconnect assembly recited as in claim 5 wherein:

the one or more conversion devices of the first interface are arranged at a first end of the substrate and include a first set of electrical contacts;

the one or more conversion devices of the second interface are arranged at a second end of the substrate and include a second set of electrical contacts; and

wherein the attachment fixture comprises;

a first attachment fixture positioned on the first end of the substrate and configured to enable the flexible substrate to be reversibly coupled and electrically connected with a first attachment apparatus; and

a second attachment fixture positioned on the second end of the substrate and configured to enable the flexible substrate to be reversibly coupled and electrically connected with a second attachment apparatus.

7. A system for transmitting data to a device, comprising:

a first electrical device;

the flexible interconnect assembly of claim 1, the one or more conversion devices of the first interface of the flexible interconnect assembly including

a first conversion device positioned on the flexible circuit substrate, the first conversion device configured to convert between electrical and optical signals; and

an attachment apparatus suitable for reversibly securing a flexible interconnect assembly and electrically coupling the first electrical device and the first conversion device, thereby enabling at least one of;

receiving electrical signals from the first conversion device; and

transmitting electrical signals to the first conversion device.

8. The system of claim 7, comprising:

a second electrical device coupled with the first electrical device via the flexible interconnect assembly, wherein the first electrical device is a multi-core CPU and the second electrical device is memory.

9. The system of claim 7,

wherein a second conversion device of the one or more conversion devices of the second interface of the flexible interconnect assembly is configured to convert a first set of electrical signals into a set of optical signals;

wherein the first conversion device is configured to receive the set of optical signals from the second conversion device and convert the set of optical signals into a second set of electrical signals for transmission to the first electrical device; and

wherein the attachment apparatus is configured to receive the second set of electrical signals from the first conversion device and transmit the second set of electrical signals to the first electrical device.

10. The system of claim 9, wherein:

the optical waveguide extends between the first and second ends of the flexible interconnect assembly and is configured to transmit the set of optical signals along the length of the flexible interconnect assembly between the first and second conversion devices.

11. The system of claim 7, wherein the attachment apparatus comprises a first set of electrical contacts and wherein the flexible interconnect assembly comprises a second set of electrical contacts and wherein the attachment apparatus is configured such that the coupling of the attachment apparatus and the flexible interconnect assembly causes the first set of electrical contacts to electrically connect with the second set of electrical contacts, thereby enabling transmission of electrical signals between the first electrical device and the flexible interconnect assembly.

12. The system of claim 11, wherein the first electrical device is an electronic substrate mounted onto a printed circuit board, the electronic substrate having conductive traces that electrically connect the first set of electrical contacts of the attachment apparatus with a plurality of electrical components on the printed circuit board, the flexible interconnect assembly configured to transmit electrical signals to at least one of the plurality of electrical components via the second set of electrical contacts, the first set of electrical contacts and the conductive traces.

13. The system of claim 7, wherein the attachment device is configured to be fastened to the flexible interconnect assembly without the use of soldering.

14. A method for transmitting data to an electrical device, comprising:

providing the flexible interconnect assembly of claim 1, wherein the flexible interconnect assembly is coupled to a first electrical device;

transmitting a first set of electrical signals from the first electrical device to the flexible interconnect assembly;

receiving the first set of electrical signals at a first one of at least one electro-optic transceiver mounted onto the flexible interconnect assembly; and

converting, using the first one of the at least one electro-optic transceiver, the first set of electrical signals into a set of optical signals.

15. The method of claim 14 comprising:

transmitting, using the optical waveguide, the set of optical signals to a second one of the at least one electro-optic transceiver mounted onto the flexible interconnect assembly;

receiving the set of optical signals at the second one of the at least one electro-optic transceiver device;

converting, using the second one of the at least one electro-optic transceiver, the set of optical signals into a second set of electrical signals; and

transmitting the second set of electrical signals to a second electrical device coupled to the flexible interconnect assembly.

16. The method of claim 14 comprising:

transmitting, using the optical waveguide, the set of optical signals;

converting, using the at least one electro-optic transceiver, the set of optical signals into a second set of electrical signals; and

transmitting the second set of electrical signals to a second electrical device coupled to the flexible interconnect assembly.

17. The method of claim 14, wherein the first set of electrical signals and the set of optical signals relate to clock synchronization data.

18. The method of claim 14 comprising:

coupling the flexible interconnect assembly to the first electrical device via an attachment apparatus, wherein said coupling establishes an electrical connection between the first electrical device and said at least one transceiver, the attachment apparatus being configured to couple to or decouple from the flexible interconnect assembly without soldering.

19. A method for transmitting data to an electrical device, comprising:

providing the flexible interconnect assembly of claim 1, the flexible interconnect assembly having at least one electro-optic transceiver optically coupled with the optical waveguide;

receiving a set of optical signals at the optical waveguide;

converting, using a first one of the at least one electro-optic transceiver, the set of optical signals into a set of electrical signals; and

transmitting the set of electrical signals to an electrical device.

20. A system for communicating signals between multiple electrical components, comprising:

a plurality of electrical components;

a plurality of flexible interconnect assemblies coupling the plurality of electrical components to one another using an associated plurality of coupling systems, each flexible interconnect assembly being a flexible interconnect assembly as recited in claim 1 and configured to;

receive a first set of electrical signals from a first one of the electrical components;

convert the first set of electrical signals into a set of transformed signals;

transmit the set of transformed signals along the length of the flexible interconnect assembly;

convert the set of transformed signals into a second set of electrical signals; and

transmit the second set of electrical signals to a second one of the electrical components, wherein the plurality of flexible interconnect assemblies are configured such that there is no crosstalk between the plurality of flexible interconnect assemblies while the plurality of flexible interconnect assemblies are transmitting signals.

21. The system of claim 20, wherein the plurality of electrical components includes a multi-core CPU and memory.

22. The system of claim 20, wherein each one of the plurality of flexible interconnect assemblies has at least one optical waveguide, the at least one optical waveguide having a core pitch of approximately 20 microns.

23. The system of claim 20, wherein each of the plurality of electrical components lacks the ability to directly process optical signals.

24. The system of claim 20, wherein the first set of electrical signals, the set of transformed signals and the second set of electrical signals are related to clock signals.

25. A system for communicating optical signals between a plurality of electrical devices via a flexible interconnect assembly, the system comprising:

the flexible interconnect assembly of claim 1, the attachment fixture of the flexible interconnect assembly mounted on the first interface at the first end of the flexible interconnect assembly; and

an electrical device, an attachment apparatus mounted on an exterior surface of the electrical device, the attachment fixture at the first end of the flexible interconnect assembly being at least partially inserted into an opening in the attachment apparatus on the electrical device, the attachment fixture being secured to the attachment apparatus on the electrical device with a locking mechanism in the opening of the attachment apparatus, the locking mechanism involving at least one of a group selected from;

a clamp, a fastener, a latch, a lever, a hook and a ring, the locking mechanism arranged to help establish an electrical connection between the flexible interconnect assembly and the electrical device, wherein the locking mechanism in the opening is arranged such that the attachment apparatus on the electrical device is entirely decoupled from the attachment fixture on the flexible interconnect assembly upon application of pressure and without application of heat.