Optical line terminal (OLT) support of optical network unit (ONU) calibration

• US 9,768,905 B2
• Filed: 05/15/2015
• Issued: 09/19/2017
• 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: Wu, Xuming, Liu, Dekun, Luo, Yuanqiu, Gao, Jianhe, Gao, Bo
• Primary Examiner(s): WOLDEKIDAN, HIBRET ASNAKE
• Application Number:
  US14/713,550
• Publication Number:
  US 20150381306A1
• Time in Patent Office: 858 Days
• Field of Search: 398 66- 72
• 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 that is generated by the ONU for distinguishing an upstream physical layer operation, administration and maintenance (PLOAM) message from the ONU from other PLOAM messages, and wherein the unique number for the ONU changes when the ONU tunes at least one of a wavelength and a power of upstream optical signals transmitted by the ONU;

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 an upstream passive optical network identification (PON-ID); 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 upstream PON-ID is at least one of a current PON-ID and a target PON-ID, and wherein the upstream PON-ID includes a calibration status bit.

3. The OLT CT of claim 2, wherein the calibration status bit has a first binary value indicating 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.

4. The OLT CT of claim 3, wherein the downstream message further comprises a current upstream PON-ID, wherein the current upstream PON-ID indicates that the upstream wavelength is being calibrated and received, and a target upstream PON-ID that indicates a wavelength channel to be calibrated.

5. The OLT CT of claim 4, 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.

6. The OLT CT of claim 5, wherein the upstream message and the downstream message are PLOAM messages.

7. 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 that is generated b the ONU for distinguishing an upstream physical layer operation, administration and maintenance (PLOAM) message from the ONU from other PLOAM messages, and wherein the unique number for the ONU changes when the ONU tunes at least one of a wavelength and a power of upstream optical signals transmitted by the ONU; 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 and an upstream passive optical network identification (PON-ID).

8. The ONU of claim 7, wherein the upstream PON-ID is at least one of a current PON-ID and a target PON-ID, and wherein the upstream PON-ID includes a calibration status bit.

9. The ONU of claim 8, 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.

10. The ONU of claim 9, wherein the downstream message further comprises a current upstream PON-ID, wherein the current upstream PON-ID indicates that the upstream wavelength is being calibrated and received, and a target upstream PON-ID indicates an upstream wavelength channel to be calibrated.

11. The ONU of claim 10, 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.

12. The ONU of claim 11, wherein the upstream message and the downstream message are PLOAM messages.

13. 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 that is generated by the, ONU for distinguishing an upstream physical layer operation, administration and maintenance (PLOAM) message from the ONU from other PLOAM messages, and wherein the unique number for the ONU changes when the ONU tunes at least one of a wavelength and a power of upstream optical signals transmitted by the ONU;

generating a downstream message based on the upstream message, wherein the downstream message comprises the correlation tag and an upstream passive optical network identification (PON-ID); and

transmitting the downstream message to the ONU.

14. The method of claim 13, wherein the upstream PON-ID is at least one of a current PON-ID and a target PON-ID, wherein the upstream PON-ID includes 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.

15. The method of claim 14, wherein the downstream message further comprises a current upstream PON-ID, wherein the current upstream PON-ID indicates that an upstream wavelength is being calibrated and received, and a target upstream PON-ID that indicates a wavelength channel to be calibrated.

16. 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 that is generated by the ONU for distinguishing an upstream physical layer operation, administration and maintenance (PLOAM) message from the ONU from other PLOAM messages, and wherein the unique number for the ONU changes when the ONU tunes at least one of a wavelength and a power of upstream optical signals transmitted by the ONU; and

receiving a downstream message from the OLT CT, wherein the downstream message comprises the correlation tag and an upstream passive optical network identification (PON-ID).