Optical connectors for electronic devices

• US 7,347,632 B2
• Filed: 12/10/2004
• Issued: 03/25/2008
• Est. Priority Date: 12/12/2003
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Farr, Mina
• Primary Examiner(s): Kim; Ellen E.
• Application Number:
  US11/009,208
• Publication Number:
  US 20050180700A1
• Time in Patent Office: 1,201 Days
• Field of Search: 385/89
• US Class Current: 385/89
• CPC Class Codes: G02B 6/4224 using visual alignment markings, e.g. index methods
• CPC Class Codes: G02B 6/4239 Adhesive bonding; Encapsulation with polymer material
• CPC Class Codes: G02B 6/4246 Bidirectionally operating package structures

Abstract

A high-data rate connector for use with consumer electronics couples digital electrical connection interfaces with optical cabling and optical transceivers. In one implementation, an electrical connection interface, such as a DVI, HDMI, or USB connection interface is electrically coupled to an optical transceiver. The optical transceiver includes an optical transmitter, such as a VCSEL, and an optical detector, such as a photodiode. The transmit fiber and the receive fiber are each positioned relatively close to the corresponding optical transmitter and optical detector without a lens. The optical transmitter and the optical detector are each optimized for the size of the optical fiber core to enable high throughput speed at relatively low cost.

Claims

1. An HDMI connector cable configured to communicate digital content between two electronic devices using optical multimode fibers comprising:

an electrical connection interface configured for an HDMI connection; and

an optical transceiver that is communicably coupled with the HDMI electrical connection interface, the optical transceiver having an optical transmitter in direct optical communication with an optical transmit fiber, and an optical detector in direct optical communication with an optical receive fiber.

2. The connector cable as recited in claim 1, wherein the optical transmitter is a VCSEL.

3. The connector cable as recited in claim 1, wherein the optical detector includes a PN photodiode, a PIN photodiode, or an avalanche photodiode.

4. The connector cable as recited in claim 1, wherein a core of the optical transmit fiber is separated from the optical transmitter by an epoxy, wherein the epoxy is an index-matched epoxy.

5. The cable as recited in claim 4, wherein the optical transmitter and the optical detector are each mounted to a corresponding transmit or receive sub-mount on the transceiver, and wherein the optical transmit fiber and the optical receive fiber are adhered by the index-matched epoxy to the corresponding transmit or receive sub-mount.

6. The connector cable as recited in claim 1, wherein the optical transmit fiber and the optical detector fiber are each aligned within about 10 microns from the corresponding optical transmitter and the optical detector.

7. The connector cable as recited in claim 1, wherein an alignment fault tolerance between the optical transmit fiber and the optical transmitter is plus or minus 5 micron.

8. The connector cable as recited in claim 1, wherein the alignment of the optical transmit fiber to the optical transmitter and alignment of the optical detector to the optical receive fiber is performed in a single alignment act.

9. The connector cable as recited in claim 1, wherein the optical transmit fiber and the optical receive fiber are both held by a fiber block.

10. The connector cable as recited in claim 1, wherein an active area diameter of the optical detector is about 20 microns larger than a core diameter of the optical receive fiber.

11. The connector cable as recited in claim 1, wherein the optical transmit fiber has a numerical aperture value that is greater than the numerical aperture value of the optical transmitter.

12. The connector cable as recited in claim 11, wherein the numerical aperture value of the optical transmit fiber is about 0.275.

13. The connector cable as recited in claim 11, wherein the numerical aperture value of the optical transmit fiber is about 0.2.

14. The connector cable as recited in claim 1, wherein the optical receive fiber has an optical fiber core size that is smaller than an active area of the optical detector.

15. The connector cable as recited in claim 14, wherein the receive fiber core has a diameter of about 62.5 microns, and wherein the diameter of the optical detector is at least about 62.5 microns.

16. The connector cable as recited in claim 14, wherein the receive fiber core has a diameter of about 50 microns, and wherein the diameter of the optical detector is at least about 50 microns.

17. The connector cable as recited in claim 1, wherein the optical detector is compatible with data rates of about 2.0 gbps or about 10.0 gbps.

18. The connector cable as recited in claim 1, wherein the optical transceiver includes a transmit guiding ring secured about the optical transmitter, and a receive guiding ring secured about the optical receiver.

19. The connector cable as recited in claim 1, further comprising a fiber block mounted to the optical transmitter and the optical detector, the fiber block including the optical transmit fiber and an optical receiver fiber aligned therein, such that no air gap transition exists between a core of the optical transmit or receive fiber and the corresponding optical transmitter or optical detector.

20. The connector cable as recited in claim 19, wherein the fiber block further comprises a plurality of jackets welded therein, the plurality of jackets being configured to align the optical transmit fiber and the optical receive fiber within close proximity to the optical transmitter or the optical receiver.

21. The connector cable as recited in claim 1, wherein multiple electrical signals are converted into a single optical signal for transmission over the single optical transmit fiber.

22. The connector cable as recited in claim 1, further comprising a substrate including mounting connections, wherein active and/or passive circuitry components for transferring signals at the device level are mounted on a side of the substrate opposite to the side to which the mounting connections are mounted.

23. The connector cable as recited in claim 1, further comprising a component configured to control the optical transmitter.

24. The connector cable as recited in claim 23, further comprising memory coupled to the component configured to control the optical transmitter.

25. The connector cable as recited in claim 1, wherein the transmit fiber and the receive fiber include an SC connector, an LC connector, or a fiber optic pigtail.

26. The connector cable as recited in claim 1, wherein the optical receiver includes an integrated detector preamplifier.