SELF-TESTING OPTICAL TRANSCEIVER

• US 20090028574A1
• Filed: 07/23/2007
• Published: 01/29/2009
• Est. Priority Date: 07/23/2007
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Gerald L. Dybsetter, Luke M. Ekkizogloy
• Inventors: Dybsetter, Gerald L., Ekkizogloy, Luke M.
• Granted Patent: US 8,583,395 B2
• Time in Patent Office: Days
• US Class Current: 398/135
• CPC Class Codes: G06F 11/27 Built-in tests
• CPC Class Codes: H04B 10/40 Transceivers

Abstract

Systems and methods for an optical transceiver module to perform one or more diagnostic self-tests without the assistance of a host computing system. The optical transceiver module includes at least one processor, a persistent memory and a system memory. The persistent memory, which is coupled to the at least one processor, contains microcode. The microcode is loaded from the persistent memory to the system memory and executed by the at least one processor. The executed microcode causes the optical transceiver module to perform one or more diagnostic self-tests. The diagnostic result data of the one or more diagnostic self-tests is then stored in the persistent memory and is formatted for analysis. The formatted data may then be analyzed to ascertain the response of the optical transceiver to changes in its test environment.

Claims

1. In an optical transceiver module that includes at least one processor, a persistent memory and a system memory, a method for the optical transceiver module to perform one or more diagnostic self-tests without the assistance of a host operating system, the method comprising the following:

an act of loading microcode from the persistent memory to the system memory;

an act of executing the microcode using the at least one processor, wherein the microcode is structured such that the optical transceiver module performs the following when executed by the at least one processor;

an act of performing one or more diagnostic self-tests;

an act of storing diagnostic result data of the one or more diagnostic self-tests the in the persistent memory; and

an act of formatting the stored diagnostic results for analysis.

2. The method in accordance with claim 1, further comprising:

an act of analyzing the formatted stored diagnostic result data to ascertain the response of the optical transceiver module to changes in its test environment.

3. The method in accordance with claim 1, the optical transceiver module further including at least one sensor, wherein the act of performing one or more diagnostic self-tests comprises:

an act of sensing data of at least one operational or environmental parameter relating to the optical transceiver module.

4. The method in accordance with claim 3, wherein the operational or environmental parameter is one of operating time, laser bias current, laser power, laser wavelength, received power, module temperature, laser temperature, or voltage measured at a specific portion of the optical transceiver module.

5. The method in accordance with claim 1, the optical transceiver module further 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, and a configurable switch array, wherein the act of performing one or more diagnostic self-tests comprises:

an act of controlling the configurable switch array to selectively connect and disconnect 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 such that the optical transceiver module enters or leaves an analog loopback mode.

6. The method in accordance with claim 5, 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.

7. The method in accordance with claim 1, the optical transceiver module further including a microcontroller that includes the at least one processor and the system memory, the microprocessor further including a including a plurality of input terminals, a plurality of output terminals, and a configurable switch array, wherein the act of performing one or more diagnostic self-tests comprises:

an act of closing the configurable switch array so as to couple one of the output terminals to one of the input terminals;

an act of asserting a signal on the output terminal;

an act of receiving a corresponding signal on the input terminal; and

an act of detecting a response of the microcontroller to the received signal on the input terminal.

8. The method in accordance with claim 7, wherein the asserted signal is an analog signal

9. The method in accordance with claim 7, wherein the asserted signal is a digital signal.

10. The method in accordance with claim 1, further comprising:

an act of loading the formatted stored diagnostic result data to host computing system that is coupled to the optical transceiver module.

11. An optical transceiver module comprising the following:

at least one processor;

a system memory;

a persistent memory, wherein the persistent memory contains microcode that when executed by the at least one processor, causes the optical transceiver module to perform the following;

an act of performing one or more diagnostic self-tests;

an act of storing diagnostic result data of the one or more diagnostic self-tests the in the persistent memory; and

an act of formatting the stored diagnostic results for analysis.

12. The optical transceiver module in accordance with claim 11, wherein the executed microcode further causes the optical transceiver module to perform the following:

an act of analyzing the formatted stored diagnostic result data to ascertain the response of the optical transceiver module to changes in its test environment.

13. The optical transceiver module in accordance with claim 11, the optical transceiver module further including a sensor for sensing an environmental or operational parameter, wherein the act of performing one or more diagnostic self-tests comprises:

an act of sensing data of at least one operational or environmental parameter relating to the optical transceiver module.

14. The optical transceiver module in accordance with claim 13, wherein the operational or environmental parameter is one of operating time, laser bias current, laser power, laser wavelength, received power, module temperature, laser temperature, or voltage measured at a specific portion of the optical transceiver module.

15. The optical transceiver module in accordance with claim 11, the optical transceiver module further 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, and a configurable switch array, wherein the act of performing one or more diagnostic self-tests comprises:

an act of controlling the configurable switch array to selectively connect and disconnect 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 such that the optical transceiver module enters or leaves an analog loopback mode.

16. The optical transceiver module in accordance with claim 15, 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.

17. The optical transceiver module in accordance with claim 11, the optical transceiver module further including a microcontroller that includes the at least one processor and the system memory, the microprocessor further including a plurality of input terminals, a plurality of output terminals, and a configurable switch array, wherein the act of performing one or more diagnostic self-tests comprises:

an act of closing the configurable switch array so as to couple one of the output terminals to one of the input terminals;

an act of asserting a signal on the output terminal;

an act of receiving a corresponding signal on the input terminal; and

an act of detecting a response of the microcontroller to the received signal on the input terminal.

18. The optical transceiver module in accordance with claim 17, wherein the asserted signal is an analog signal

19. The optical transceiver module in accordance with claim 17, wherein the asserted signal is a digital signal.

20. The optical transceiver module in accordance with claim 11, wherein the executed microcode further causes the optical transceiver module to perform the following:

an act of loading the formatted stored diagnostic result data to host computing system that is coupled to the optical transceiver module.