Active optical cable with integrated retiming
View Patent ↗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 least one end. The active cable includes an integrated retiming mechanism. Thus, multiple links of cable may be used while reducing the chance that the jitter will exceed allowable limits. The cable may be an electrical to optical cable, and electrical to electrical cable, or one of many other potential configurations.
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 retiming mechanism for supporting retiming of an input high speed electrical signal to reduce total link jitter in the integrated cable; and
a mechanism for providing host selectable pre-emphasis of an output high speed electrical signal to reduce total link jitter, wherein the level of pre-emphasis is host adjustable via a serial interface of the integrated cable.
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 , further comprising:
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; and
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.
4. An integrated cable in accordance with claim 3 , further comprising:
a first optical connector coupled to a second end of the first optical fiber; and
a second optical connector coupled to a second end of the second optical fiber.
5. An integrated cable in accordance with claim 4 , wherein the first and second optical connector form part of the same piece.
6. An integrated cable in accordance with claim 3 , further comprising:
a second opto-electrical transducer within the integrated cable and coupled to a second end of the second optical fiber such that when a third optical signal is present on the second optical fiber, the second opto-electrical transducer receives the third optical signal and converts the third 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 third 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 a fourth 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 fourth optical signal from the second electro-optical transducer at a second end of the first optical fiber.
7. An integrated cable in accordance with claim 1 , wherein the integrated cable supports data rates of between 1 to 11.5 gigabits per second, inclusive.
8. An integrated cable in accordance with claim 1 , wherein a length of the integrated cable is between 1 and 30 meters.
9. An integrated cable in accordance with claim 1 , further comprising:
a mechanism for providing host selectable equalization of the input high speed electrical signal to reduce total link jitter.
10. An integrated cable in accordance with claim 1 , further comprising:
a mechanism that provides preemphasis of an output high speed electrical signal to reduce total link jitter.
11. An integrated cable in accordance with claim 1 , wherein the integrated cable supports predefined limits of added deterministic and total jitter of a high speed signal.
12. An integrated cable in accordance with claim 11 , wherein the predefined limits of added deterministic and total jitter are chosen to allow concatenation of up to 3 cables.
13. An integrated cable in accordance with claim 1 , wherein the integrated cable has an optical connection at a second end of the integrated cable to thereby form a first E-O cable, the integrated cable being part of a sequence of cables including the first E-O cable at a first end of the sequence, a second E-O cable at the second end of the sequence, and one or more optical cables between the first and second E-O cables.
14. An integrated cable in accordance with claim 1 , wherein the integrated cable has an optical connection at a second end of the integrated cable, wherein the optical connection is sized to be coupled to an optical transceiver.
15. An integrated cable in accordance with claim 1 , wherein the integrated cable has a second electrical connector at a second end of the integrated cable to thereby form a first E-E cable, the electrical connection being sized to connect with a receptacle of a cable plug end adaptor.
16. An integrated cable in accordance with claim 1 , wherein the integrated cable has a second electrical connector at a second end of the integrated cable to thereby form a first E-E cable, the first electrical connector being a male connector, and second electrical connector being a female connector configured to receive an electrical connector that is sized and shaped the same as the first electrical connector.
17. 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; and
a mechanism for supporting adaptive equalization of an input high speed electrical signal to reduce total link jitter in the integrated cable;
a retiming mechanism for supporting retiming of an input high speed electrical signal to reduce total link jitter in the integrated cable;
an electrical conductor configured to carry electrical power to the cable end; and
means for converting down the electrical power to power at least the retiming mechanism.
18. An integrated cable in accordance with claim 17 , wherein the equalization is configured to compensate for high frequency rolloff of the host's traces.
19. An integrated cable in accordance with claim 17 , wherein the equalization is configured to compensate for the integrated cable's high frequency rolloff.
20. An integrated cable in accordance with claim 17 , wherein the equalization is automatically adaptive to host impairments.
21. An integrated cable in accordance with claim 17 , wherein the power is at least 40 volts.