Bi-directional temperature controlled optical transceiver

• US 10,439,726 B1
• Filed: 11/01/2018
• Issued: 10/08/2019
• Est. Priority Date: 11/01/2018
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Mazzini, Marco, Cervasio, Alberto, Ling, Tao
• Primary Examiner(s): Li, Shi K
• Application Number:
  US16/177,737
• Time in Patent Office: 341 Days
• CPC Class Codes: G02B 6/4246 Bidirectionally operating package structures
• CPC Class Codes: G02B 6/4271 with thermo electric cooling
• CPC Class Codes: H04B 10/0799 Monitoring line transmitter or line receiver equipment
• CPC Class Codes: H04B 10/2589 Bidirectional transmission
• CPC Class Codes: H04B 10/25891 Transmission components H04B10/40 takes precedence
• CPC Class Codes: H04B 10/40 Transceivers

Abstract

A local node of an optical network obtains local operating parameters associated with a bi-directional link to a remote node of the optical network, including a nominal local wavelength and a local temperature. The local node also obtains remote operating parameters of the remote node, including a nominal remote wavelength and a remote temperature. The local node further determines a target local wavelength based on a comparison of the local operating parameters and the remote operating parameters, and tunes a local transmitter to generate light at the target local wavelength. The local node also tunes a local filter to transmit light at the target local wavelength and reflect light at a target remote wavelength. This may be done by exchanging a configuration identifier with the remote node. The configuration identifier from the remote node is encoded in pulses of light from a remote transmitter in the remote node.

Claims

1. A method comprising:

at a local node in an optical network, obtaining local operating parameters associated with a bi-directional link with a remote node, the local operating parameters including a nominal local wavelength and a local temperature;

obtaining remote operating parameters of the remote node, the remote operating parameters including a nominal remote wavelength and a remote temperature;

determining a target local wavelength based on a comparison of the local operating parameters and the remote operating parameters;

tuning a local transmitter to generate light at the target local wavelength; and

tuning a local filter to transmit light at the target local wavelength and reflect light at a target remote wavelength.

2. The method of claim 1, wherein the target local wavelength and the target remote wavelength are separated by at least 2 nanometers.

3. The method of claim 1, wherein the local filter comprises a Bragg grating formed in silicon.

4. The method of claim 1, wherein tuning the local transmitter and tuning the local filter comprises adjusting the local temperature.

5. The method of claim 1, wherein obtaining the remote operating parameters comprises receiving a configuration identifier from the remote node.

6. The method of claim 5, wherein the configuration identifier is encoded in pulses of light from a remote transmitter in the remote node.

7. The method of claim 6, further comprising looking up the configuration identifier in a local storage to obtain the nominal remote wavelength.

8. An apparatus comprising:

an optical network interface comprising a local transmitter, a local receiver, and a local filter, the optical network interface forming a bi-directional link between the apparatus and a remote node in an optical network; and

a processor coupled to the optical network interface, and configured to;

obtain local operating parameters associated with the bi-directional link with the remote node, the local operating parameters including a nominal local wavelength and a local temperature;

obtain remote operating parameters of the remote node, the remote operating parameters including a nominal remote wavelength and a remote temperature;

determine a target local wavelength based on a comparison of the local operating parameters and the remote operating parameters;

tune the local transmitter to generate light at the target local wavelength; and

tune the local filter to transmit light at the target local wavelength and reflect light at a target remote wavelength.

9. The apparatus of claim 8, wherein the processor is configured to separate the target local wavelength and the target remote wavelength by at least 2 nanometers.

10. The apparatus of claim 8, wherein the local filter comprises a Bragg grating formed in silicon.

11. The apparatus of claim 8, wherein the processor is configured to tune the local transmitter and tune the local filter by adjusting the local temperature.

12. The apparatus of claim 8, wherein the processor is configured to obtain the remote operating parameters by receiving a configuration identifier from the remote node via the optical network interface.

13. The apparatus of claim 12, wherein the optical network interface is configured to receive the configuration identifier encoded in pulses of light from a remote transmitter in the remote node.

14. The apparatus of claim 13, wherein the processor is further configured to look up the configuration identifier in a local storage to obtain the nominal remote wavelength.

15. One or more non-transitory computer readable storage media encoded with software comprising computer executable instructions and, when the software is executed by a processor, cause the processor to:

obtain local operating parameters associated with a bi-directional link between a local node and a remote node on an optical network, the local operating parameters including a nominal local wavelength and a local temperature;

obtain remote operating parameters of the remote node, the remote operating parameters including a nominal remote wavelength and a remote temperature;

determine a target local wavelength based on a comparison of the local operating parameters and the remote operating parameters;

tune a local transmitter to generate light at the target local wavelength; and

tune a local filter to transmit light at the target local wavelength and reflect light at a target remote wavelength.

16. The non-transitory computer readable storage media of claim 15, further comprising instructions that cause the processor to separate the target local wavelength and the target remote wavelength by at least 2 nanometers.

17. The non-transitory computer readable storage media of claim 15, further comprising instructions that cause the processor to tune the local transmitter and tune the local filter by adjusting the local temperature.

18. The non-transitory computer readable storage media of claim 15, further comprising instructions that cause the processor to obtain the remote operating parameters by receiving a configuration identifier from the remote node.

19. The non-transitory computer readable storage media of claim 18, further comprising instructions that cause the processor to receive the configuration identifier encoded in pulses of light from a remote transmitter in the remote node.

20. The non-transitory computer readable storage media of claim 19, further comprising instructions that cause the processor to look up the configuration identifier in a local storage to obtain the nominal remote wavelength.