Optical Line Terminal (OLT) Support of Optical Network Unit (ONU) Calibration

• US 20150381306A1
• Filed: 05/15/2015
• Published: 12/31/2015
• Est. Priority Date: 06/25/2014
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liu, Dekun, Luo, Yuanqiu, Gao, Jianhe, Gao, Bo, Wu, Xuming
• Granted Patent: US 9,768,905 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 10/0773 Network aspects, e.g. central monitoring of transmission parameters
• CPC Class Codes: H04B 10/0775 Performance monitoring and measurement of transmission parameters
• CPC Class Codes: H04B 10/272 Star-type networks or tree-type networks
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/0223 Conversion to or from optical TDM
• CPC Class Codes: H04J 14/0252 Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
• CPC Class Codes: H04J 14/0282 WDM tree architectures

Abstract

An optical line terminal (OLT) channel termination (CT) comprises a receiver configured to receive an upstream message which comprises a correlation tag from an optical network unit (ONU), wherein the correlation tag represents a unique number, a processor coupled to the receiver and configured to process the upstream message, and generate a downstream message based on the upstream message, wherein the downstream message comprises the correlation tag, and a transmitter coupled to the processor and configured to transmit the downstream message to the ONU.

Claims

1. An optical line terminal (OLT) channel termination (CT) comprising:

a receiver configured to receive an upstream message from an optical network unit (ONU), wherein the upstream message comprises a correlation tag, wherein the correlation tag represents a unique number;

a processor coupled to the receiver and configured to generate a downstream message based on the upstream message, wherein the downstream message comprises the correlation tag; and

a transmitter coupled to the processor and configured to transmit the downstream message to the ONU.

2. The OLT CT of claim 1, wherein the correlation tag comprises a first value which differentiates the ONU from other ONUs, and wherein the first value changes to a second value when the ONU tunes at least one of wavelength and power of upstream optical signals.

3. The OLT CT of claim 2, wherein the downstream message further comprises a calibration identification (ID), and wherein the calibration ID comprises “

0”

bits and a calibration status bit.

4. The OLT CT of claim 3, wherein the calibration status bit has a first binary value indicating the ONU should continue calibration, wherein the calibration status bit has a second binary value indicating the ONU should be activated, and wherein the first binary value and the second binary value are different.

5. The OLT CT of claim 4, wherein the downstream message further comprises an upstream wavelength channel ID, wherein the upstream wavelength channel ID indicates the wavelength channel in which the upstream wavelength is being calibrated when the calibration status bit has the first binary value, and wherein the upstream wavelength channel ID indicates the wavelength channel which is ready for activation when the calibration status bit has the second binary value.

6. The OLT CT of claim 5, wherein the downstream message further comprises a received signal strength indicator (RSSI), and wherein the RSSI indicates optical power received from the ONU at the OLT CT.

7. The OLT CT of claim 6, wherein the upstream message and the downstream message are physical layer operation, administration and maintenance (PLOAM) messages.

8. An optical network unit (ONU) comprising:

a transmitter configured to transmit an upstream message to an optical line terminal (OLT) channel termination (CT), wherein the upstream message comprises a correlation tag, wherein the correlation tag represents a unique number; and

a receiver coupled to the transmitter and configured to receive a downstream message from the OLT CT, wherein the downstream message comprises the correlation tag.

9. The ONU of claim 8, wherein the correlation tag comprises a first value which differentiates the ONU from other ONUs, and wherein the first value changes to a second value when the ONU tunes at least one of wavelength and power of upstream optical signals.

10. The ONU of claim 9, wherein the downstream message further comprises a calibration ID, and wherein the calibration ID comprises “

0”

bits and a calibration status bit.

11. The ONU of claim 10, wherein the calibration status bit has a first binary value indicating the ONU should continue calibration, wherein the calibration status bit has a second binary value indicating the ONU should be activated, and wherein the first binary value and the second binary value are different.

12. The ONU of claim 11, wherein the downstream message further comprises an upstream wavelength channel ID, wherein the upstream wavelength channel ID indicates the upstream wavelength channel in which the upstream wavelength is being calibrated when the calibration status bit has the first binary value, and wherein the upstream wavelength channel ID indicates the upstream wavelength channel which is ready for activation when the calibration status bit has the second binary value.

13. The ONU of claim 12, wherein the downstream message further comprises a received signal strength indicator (RSSI), and wherein the RSSI indicates received optical power at the OLT from the ONU.

14. The ONU of claim 13, wherein the upstream message and the downstream message are physical layer operation, administration and maintenance (PLOAM) messages.

15. A method for optical network unit (ONU) online calibration, comprising:

receiving an upstream message from an ONU, wherein the upstream message comprises a correlation tag, wherein the correlation tag represents a unique number;

generating a downstream message based on the upstream message, wherein the downstream message comprises the correlation tag; and

transmitting the downstream message to the ONU.

16. The method of claim 15, wherein the correlation tag comprises a first value which differentiates the ONU from other ONUs, and wherein the first value changes to a second value when the ONU tunes at least one of wavelength and power of upstream optical signals.

17. The method of claim 16, wherein the downstream message further comprises a calibration ID, wherein the calibration ID comprises “

0”

bits and a calibration status bit, wherein the calibration status bit has a first binary value indicating the ONU should continue calibration, wherein the calibration status bit has a second binary value indicating the ONU should be activated, and wherein the first binary value and the second binary value are different.

18. The method of claim 17, wherein the downstream message further comprises an upstream wavelength channel ID, wherein the upstream wavelength channel ID indicates a wavelength channel in which the upstream wavelength is being calibrated when the calibration status bit has the first binary value, and wherein the upstream wavelength channel ID indicates the wavelength channel which is ready for activation when the calibration status bit has the second binary value.

19. A method for optical network unit (ONU) online calibration, comprising:

transmitting an upstream message to an optical line terminal (OLT) channel termination (CT), wherein the upstream message comprises a correlation tag, wherein the correlation tag represents a unique number; and

receiving a downstream message from the OLT CT, wherein the downstream message comprises the correlation tag.

20. The method of claim 19, wherein the correlation tag comprises a first value which differentiates the ONU from other ONUs, and wherein the first value changes to a second value when the ONU tunes at least one of wavelength and power of upstream optical signals.