High speed bidirectional optical time-domain reflectometer (OTDR)-based testing of device under test

Patent metadata

Field	Value
Publication number	US-12028107-B2
Application number	US-202318374196-A
Country	US
Kind code	B2
Filing date	Sep 28, 2023
Priority date	Nov 4, 2020
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

In some examples, high speed bidirectional OTDR-based testing may include transmitting data from a first end of a device under test (DUT) towards an optical time-domain reflectometer (OTDR) that is operatively connected to a second opposite end of the DUT. Further data that is transmitted by the OTDR may be received from the second opposite end of the DUT towards the first end of the DUT. Based on an amplitude of the further data, a direction of receiving of the further data may be adjusted towards a first receiver or towards a second receiver.

First claim

What is claimed is:

1. A method comprising:
transmitting, by at least one hardware processor, data from a first end of a device under test (DUT) towards an optical time-domain reflectometer (OTDR) that is operatively connected to a second opposite end of the DUT;
receiving, by the at least one hardware processor, further data that is transmitted by the OTDR from the second opposite end of the DUT towards the first end of the DUT; and
switching, by an optical switch, based on the received further data, between an input/output data receiver and a bidirectional optical sub-assemblies (BOSA)-based data receiver associated with the data receiver.

2. The method according to claim 1 , wherein switching, by the optical switch, based on the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, further comprises:
switching, by the optical switch, based on an optical power associated with the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver.

3. The method according to claim 1 , wherein switching, by the optical switch, based on the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, further comprises:
switching, by the optical switch, based on a relatively low optical power associated with the received further data, to the input/output data receiver that includes an avalanche photodiode.

4. The method according to claim 3 , wherein switching, by the optical switch, based on the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, further comprises:
switching, by the optical switch, based on a relatively high optical power associated with the received further data, to the BOSA-based data receiver.

5. The method according to claim 1 , wherein the DUT includes a fiber optic link.

6. An apparatus comprising:
a data transmitter, executed by at least one hardware processor, to transmit data from a first end of a device under test (DUT) towards an optical time-domain reflectometer (OTDR) that is operatively connected to a second opposite end of the DUT;
a data receiver, executed by the at least one hardware processor, to receive further data that is transmitted by the OTDR from the second opposite end of the DUT towards the first end of the DUT; and
an optical switch to switch, based on the received further data, between an input/output data receiver and a bidirectional optical sub-assemblies (BOSA)-based data receiver associated with the data receiver.

7. The apparatus according to claim 6 , wherein the DUT includes a fiber optic link.

8. The apparatus according to claim 6 , wherein the data receiver comprises:
an avalanche photodiode to receive the further data that is transmitted by the OTDR from the second opposite end of the DUT towards the first end of the DUT.

9. The apparatus according to claim 8 , wherein the data receiver comprises:
a transimpedance amplifier operatively connected to the avalanche photodiode to receive the further data that is transmitted by the OTDR from the second opposite end of the DUT towards the first end of the DUT.

10. The apparatus according to claim 6 , wherein the optical switch is to switch, based on the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, by:
switching, based on an optical power associated with the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver.

11. The apparatus according to claim 6 , wherein the optical switch is to switch, based on the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, by:
switching, based on a relatively low optical power associated with the received further data, to the input/output data receiver that includes an avalanche photodiode.

12. The apparatus according to claim 11 , wherein the optical switch is to switch, based on the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, by:
switching, by the optical switch, based on a relatively high optical power associated with the received further data, to the BOSA-based data receiver.

13. A non-transitory computer readable medium having stored thereon machine readable instructions, the machine readable instructions, when executed by at least one hardware processor, cause the at least one hardware processor to:
transmit data from a first end of a device under test (DUT) towards an optical time-domain reflectometer (OTDR) that is operatively connected to a second opposite end of the DUT;
receive further data that is transmitted by the OTDR from the second opposite end of the DUT towards the first end of the DUT; and
switch, based on an attribute associated with the received further data, between an input/output data receiver and a bidirectional optical sub-assemblies (BOSA)-based data receiver associated with the data receiver.

14. The non-transitory computer readable medium according to claim 13 , wherein the DUT includes a fiber optic link.

15. The non-transitory computer readable medium according to claim 13 , wherein the machine readable instructions to switch, based on the attribute associated with the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, when executed by the at least one hardware processor, further cause the at least one hardware processor to:
switch, based on the attribute that includes an optical power associated with the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver.

16. The non-transitory computer readable medium according to claim 13 , wherein the machine readable instructions to switch, based on the attribute associated with the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, when executed by the at least one hardware processor, further cause the at least one hardware processor to:
switch, based on the attribute that includes a relatively low optical power associated with the received further data, to the input/output data receiver that includes an avalanche photodiode.

17. The non-transitory computer readable medium according to claim 16 , wherein the machine readable instructions to switch, based on the attribute associated with the received further data, between the input/output data receiver and the BOSA-based data receiver associated with the data receiver, when executed by the at least one hardware processor, further cause the at least one hardware processor to:
switch, based on the attribute that includes a relatively high optical power associated with the received further data, to the BOSA-based data receiver.

Assignees

• Viavi Solutions Inc

Inventors

• Roux Charlène
• Barrier Julien

Classifications

• H04B10/66

  Non-coherent receivers, e.g. using direct detection · CPC title

• H04B10/50

  Transmitters · CPC title

• H04B10/40

  Transceivers · CPC title

• H04B10/25

  Arrangements specific to fibre transmission · CPC title

• H04B10/674

  using a variable optical attenuator · CPC title