Transceiver based loop back initiation

• US 20060093372A1
• Filed: 10/27/2005
• Published: 05/04/2006
• Est. Priority Date: 10/29/2004
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Hahin, Jayne C., Dybsetter, Gerald L., Ekkizogloy, Luke M., Nelson, Stephen T.
• Granted Patent: US 7,881,616 B2
• Time in Patent Office: Days
• US Class Current: 398/135
• CPC Class Codes: H04B 10/50 Transmitters
• CPC Class Codes: H04B 10/66 Non-coherent receivers, e.g. using direct detection

Abstract

An operational optical transceiver configured to initiate operation in loop back mode. The optical transceiver includes transmit and receive signal paths, a memory capable of having microcode written to it, and a configurable switch array that is used to connect and disconnect the two signal paths as appropriate for a desired loop back mode. The microcode is structured to cause the optical transceiver to control the configurable switch array. This allows for analysis and diagnostics of the signal data.

Claims

1. An optical transceiver comprising the following:

a receive path comprising an opto-electric transducer configured to convert a received optical signal into a received electrical signal, and a post-amplifier configured to process the received electrical signal;

a transmit path comprising an electro-optic transducer driver configured to generate an electrical transmit signal, and an electro-optic transducer configured to convert the electrical transmit signal into an optical transmit signal;

a configurable switch array capable of selectively connecting and disconnecting a node in the receive path between the opto-electric transducer and the post-amplifier with a node in the transmit path between the electro-optic transducer driver and the electro-optic transducer;

a memory capable of having microcode written to it, wherein the microcode is structured to cause the optical transceiver to initiate operation in loop back mode by performing the following;

an act of controlling the configurable switch array.

2. An optical transceiver in accordance with claim 1, wherein the configurable switch array comprises:

a first switch for connecting the electro-optic transducer driver to the post-amplifier;

a second switch for connecting the opto-electric transducer to the electro-optic transducer;

a third switch for connecting the electro-optic transducer driver to the electro-optic transducer; and

a fourth switch for connecting the post-amplifier to the opto-electric transducer.

3. An optical transceiver in accordance with claim 1, wherein the act of controlling the configurable switch array comprises:

an act of the configurable switch array connecting the node in the receive path with the node in the transmit path to cause the electro-optic transducer driver to provide a signal to the post-amplifier while ceasing to provide a signal to the electro-optic transducer.

4. An optical transceiver in accordance with claim 1, wherein the act of controlling the configurable switch array comprises:

an act of the configurable switch array connecting the node in the receive path with the node in the transmit path to cause the electro-optic transducer driver to provide a signal to the post-amplifier while continuing to provide a signal to the electro-optic transducer.

5. An optical transceiver in accordance with claim 1, wherein the act of controlling the configurable switch array comprises:

an act of the configurable switch array connecting the node in the receive path with the node in the transmit path to cause the opto-electric transducer to provide a signal to the electro-optic transducer while ceasing to provide a signal to the post-amplifier.

6. An optical transceiver in accordance with claim 1, wherein the act of controlling the configurable switch array comprises:

an act of the configurable switch array connecting the node in the receive path with the node in the transmit path to cause the opto-electric transducer to provide a signal to the electro-optic transducer while continuing to provide a signal to the post-amplifier.

7. An optical transceiver in accordance with claim 1, wherein the node between the receive and transmit paths is a first node and the configurable switch array is further capable of selectively connecting and disconnecting a second node in the receive path between the opto-electric transducer and the post-amplifier with a second node in the transmit path between the electro-optic transducer driver and the electro-optic transducer, the act of controlling the configurable switch array comprising:

an act of the configurable switch array connecting the first node in the receive path with the first node in the transmit path that causes the electro-optic transducer driver to provide a signal to the post-amplifier while ceasing to provide a signal to the electro-optic transducer; and

an act of the configurable switch array connecting the second node in the receive path with the second node in the transmit path that causes the opto-electric transducer to provide a signal to the electro-optic transducer while ceasing to provide a signal to the post-amplifier.

8. An optical transceiver in accordance with claim 1, wherein the memory is one or more registers that are memory mapped to the configurable switch array.

9. An optical transceiver in accordance with claim 1, wherein the memory is a dedicated memory location for receiving high-level commands for controlling the configurable switch array.

10. An optical transceiver in accordance with claim 1, wherein the optical transceiver initiates operation in loop back mode in response to detecting an operational error.

11. An optical transceiver in accordance with claim 1, wherein the optical transceiver initiates operation in loop back mode in response to a user request for diagnostics.

12. An optical transceiver in accordance with claim 1, wherein the optical transceiver initiates operation in loop back mode in response to a request from a host computing system.

13. An optical transceiver in accordance with claim 1 further comprising:

while the optical transceiver is operating in loop back mode, an act of the optical transceiver initiating the end of operation in loop mode in response to a determination that loop back mode operation is no longer desired.

14. An optical transceiver in accordance with claim 1, wherein the configurable switch array is a low capacitive switching array.

15. An optical transceiver in accordance with claim 1, wherein the optical transceiver initiates operation in loop back mode in response to an input/output pin being toggled.

16. In an optical transceiver including a receive path comprising an opto-electric transducer configured to convert a received optical signal into a received electrical signal, and a post-amplifier configured to process the received electrical signal, a transmit path comprising an electro-optic transducer driver configured to generate an electrical transmit signal, and an electro-optic transducer configured to convert the electrical transmit signal into an optical transmit signal a configurable switch array capable of selectively connecting and disconnecting a node in the receive path between the opto-electric transducer and the post-amplifier with a node in the transmit path between the electro-optic transducer driver and the electro-optic transducer and a memory capable of having microcode written to it, the microcode structured to cause the optical transceiver to control the configurable switch array, a method for the optical transceiver to initiate operation in loopback mode, the method comprising:

an act of controlling the configurable switch array.

17. The method in accordance with claim 16, wherein the act of controlling the configurable switch array comprises:

an act of the configurable switch array connecting the node in the receive path with the node in the transmit path to cause the electro-optic transducer driver to provide a signal to the post-amplifier while ceasing to provide a signal to the electro-optic transducer.

18. The method in accordance with claim 16, wherein the act of controlling the configurable switch array comprises:

an act of the configurable switch array connecting the node in the receive path with the node in the transmit path to cause the electro-optic transducer driver to provide a signal to the post-amplifier while continuing to provide a signal to the electro-optic transducer.

19. The method in accordance with claim 16, wherein the act of controlling the configurable switch array comprises:

an act of the configurable switch array connecting the node in the receive path with the node in the transmit path to cause the opto-electric transducer to provide a signal to the electro-optic transducer while ceasing to provide a signal to the post-amplifier.

20. The method in accordance with claim 16, wherein the act of controlling the configurable switch array comprises:

an act of the configurable switch array connecting the node in the receive path with the node in the transmit path to cause the opto-electric transducer to provide a signal to the electro-optic transducer while continuing to provide a signal to the post-amplifier.

21. The method in accordance with claim 16, wherein the node between the receive and transmit paths is a first node and the configurable switch array is further capable of selectively connecting and disconnecting a second node in the receive path between the opto-electric transducer and the post-amplifier with a second node in the transmit path between the electro-optic transducer driver and the electro-optic transducer, the act of controlling the configurable switch array comprising:

an act of the configurable switch array connecting the first node in the receive path with the first node in the transmit path that causes the electro-optic transducer driver to provide a signal to the post-amplifier while ceasing to provide a signal to the electro-optic transducer; and

an act of the configurable switch array connecting the second node in the receive path with the second node in the transmit path that causes the opto-electric transducer to provide a signal to the electro-optic transducer while ceasing to provide a signal to the post-amplifier.