Active optical cable with integrated power

• US 7,876,989 B2
• Filed: 04/10/2006
• Issued: 01/25/2011
• Est. Priority Date: 04/10/2006
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Aronson, Lewis B., Douma, Darin J., Nguyen, The-Linh
• Primary Examiner(s): Le; Uyen-Chau N
• Assistant Examiner(s): Bedtelyon; John M
• Application Number:
  US11/401,802
• Publication Number:
  US 20070237462A1
• Time in Patent Office: 1,751 Days
• Field of Search: 385/101, 385/100, 398/140, 398/141, 398/154, 398/155
• US Class Current: 385/101
• CPC Class Codes: G02B 6/4246 Bidirectionally operating package structures
• CPC Class Codes: G02B 6/4292 the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
• CPC Class Codes: G02B 6/4416 Heterogeneous cables

Abstract

An active cable that is configured to communicate over much of its length using one or more optical fibers, and that includes an integrated electrical connector at at least one end. The active cable includes a power transmission spanning the length of the optical fiber(s). Thus, electrical power from one end of the optical cable may be provided to an opposite side of the optical cable. The cable may be an electrical to optical cable, and electrical to electrical cable, or one of many other potential configurations.

Claims

1. An integrated cable comprising:

a first optical fiber within the integrated cable;

a first opto-electrical transducer within the integrated cable and coupled to a first end of the first optical fiber such that when a first optical signal is present on the first optical fiber, the first opto-electrical transducer receives the first optical signal and converts the first optical signal into a first electrical signal;

a first electrical connector integrated with the integrated cable and coupled to the first opto-electrical transducer such that when the first optical signal is received by the first opto-electrical transducer, the first electrical connector receives the first electrical signal, wherein the first electrical connector is sized to connect with a first electrical port external to the cable such that when connected to the first electrical port and when the first electrical signal is present on the first electrical connector, the first electrical signal is provided to the first electrical port;

a first electro-optical transducer within the integrated cable and coupled to the first electrical connector such that when a second electrical signal is applied to the first electrical connector, the first electro-optical transducer receives the second electrical signal and converts the second electrical signal into a second optical signal;

a second optical fiber within the integrated cable and coupled to the first electro-optical transducer such that when the second electrical signal is present on the first electrical connector, the second optical fiber receives the second optical signal from the first electro-optical transducer at a first end of the second optical fiber;

a second opto-electrical transducer within the integrated cable and coupled to a second end of the second optical fiber such that when the second optical signal is present on the second optical fiber, the second opto-electrical transducer receives the second optical signal and converts the second optical signal into a third electrical signal;

a second electrical connector integrated with the integrated cable and coupled to the second opto-electrical transducer such that when the second optical signal is received by the second opto-electrical transducer, the second electrical connector receives the third electrical signal, wherein the second electrical connector is sized to connect with a second electrical port external to the cable such that when connected to the second electrical port and when the third electrical signal is present on the second electrical connector, the third electrical signal is provided to the second electrical port; and

a second electro-optical transducer within the integrated cable and coupled to the second electrical connector such that when a fourth electrical signal is applied to the second electrical connector, the second electro-optical transducer receives the fourth electrical signal and converts the fourth electrical signal into the first optical signal,

wherein the first optical fiber is coupled to the second electro-optical transducer such that when the fourth electrical signal is present on the second electrical connector, the first optical fiber receives the first optical signal from the second electro-optical transducer at a second end of the first optical fiber;

a first retiming circuit disposed within the integrated cable, the first retiming circuit being configured to retime the fourth electrical signal received by the second electrical connector from the second electrical port external to the cable;

a second retiming circuit disposed within the integrated cable, the second retiming circuit being configured to retime the third electrical signal received from the second opto-electrical transducer;

a first electrical conductor spanning the length of the integrated cable; and

a power connection configured to provide electrical power to the first retiming circuit over the first electrical conductor,

wherein the first retiming circuit is disposed at a far end of the integrated cable from the power connection which provides power to the first retiming circuit.

2. An integrated cable in accordance with claim 1, further comprising:

a protective coating configured to surround the first optical fiber, the first opto-electrical transducer and at least portions of the first electrical connector.

3. An integrated cable in accordance with claim 1, wherein the integrated cable supports data rates of between 1 and 11.5 gigabits per second, inclusive.

4. An integrated cable in accordance with claim 1, wherein a length of the integrated cable is between 1 and 30 meters.

5. An integrated cable in accordance with claim 1, wherein the first and second retiming circuits each include a clock and data recovery circuit.

6. An integrated cable in accordance with claim 1, further comprising a circuit that supports adaptive equalization of an input high speed electrical signal to reduce total link jitter.

7. An integrated cable in accordance with claim 6, wherein the equalization is based at least in part on a length of an electrical interconnect between the connection between the first or second connector and integrated circuit elements within a host connected to the integrated cable.

8. An integrated cable in accordance with claim 6, wherein the equalization is host-selectable via a serial interface of the integrated cable.

9. An integrated cable in accordance with claim 6, wherein the equalization is configured to compensate for high frequency rolloff of the integrated cable.

10. An integrated cable in accordance with claim 1, wherein the integrated cable includes a mechanism for confirming whether or not a full duplex connection is present.

11. An integrated cable in accordance with claim 10, wherein the integrated cable includes a mechanism configured to reduce or shut-off optical power when it is confirmed that a full duplex connection is not present.

12. An integrated cable in accordance with claim 1, wherein the integrated cable includes memory disposed on a laser driver and/or receiver IC of the integrated cable.

13. An integrated cable in accordance with claim 1, further comprising a second electrical conductor spanning the length of the integrated cable and configured to transmit serial data across the length of the integrated cable.

14. An integrated cable in accordance with claim 1, wherein the first electrical connector includes a male connector and the second electrical connector includes a female connector.

15. An integrated cable in accordance with claim 1, further comprising a circuit disposed in the integrated cable configured to provide pre-emphasis of the first or second electrical signals.

16. An integrated cable in accordance with claim 15, wherein the level of pre-emphasis is selectable by a host connected to the integrated cable.

17. An integrated cable in accordance with claim 16, wherein the selectability of the pre-emphasis depends on a length of an electrical interconnect between the first or second electrical ports and IC elements of the host.

18. An integrated cable in accordance with claim 15, wherein the pre-emphasis is accomplished by either boosting high frequency content or removing low frequency content from the first or second electrical signals.

19. An integrated cable in accordance with claim 1, wherein the:

power connection is further configured to provide electrical power at least unidirectionally between both ends of the integrated cable across the first electrical conductor and to the second retiming circuit.

20. An integrated cable in accordance with claim 1, wherein the first electrical conductor is configured to transmit serial data while conveying electrical power.