Method and Optical Line Terminal for Optical Fiber Fault Diagnosis in Passive Optical Network

• US 20130148958A1
• Filed: 12/01/2010
• Published: 06/13/2013
• Est. Priority Date: 08/23/2010
• Status: Abandoned Application

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Lu, Jianxin, Liang, Wei
• Application Number:
  US13/817,897
• Publication Number:
  US 20130148958A1
• Time in Patent Office: Days
• US Class Current: 398/13
• CPC Class Codes: H04B 10/071 using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
• CPC Class Codes: H04B 10/272 Star-type networks or tree-type networks

Abstract

A method for performing optical fiber fault diagnosis in a passive optical network is disclosed in the present invention. The method includes: after receiving an optical fiber fault diagnosis message, a receiving module of an optical line terminal triggering a test module (S10); after triggered by the receiving module, the test module performing an optical time domain reflection test, and obtaining data information (S20) of the test; and a fault diagnosis module analyzing the data information, and performing optical fiber fault diagnosis (S30). An optical line terminal is also disclosed in the present invention, including a control module and an optical module, and the control module includes a receiving module and a fault diagnosis module, and the optical module includes a test module. In the present invention, the process of optical fiber fault diagnosis is performed in combination with PON network management system.

Claims

1. A method for performing optical fiber fault diagnosis in a passive optical network, comprising:

after receiving an optical fiber fault diagnosis message, a receiving module of an optical line terminal triggering a test module;

after triggered by the receiving module, the test module performing an optical time domain reflection test, and obtaining data information of the test; and

a fault diagnosis module analyzing the data information, and performing optical fiber fault diagnosis.

2. The method according to claim 1, wherein:

in the step of performing an optical time domain reflection test, the test module performs the optical time domain reflection test according to preset optical time domain reflection test parameters;

wherein, the optical time domain reflection test parameters include;

the type of test optical signal, a waveform parameter of test optical signal, a sampling rate, analog-to-digital conversion bit width and sampling start time;

the type of test optical signal is an optical pulse, and the waveform parameter of test optical signal is the width of the optical pulse;

or, the type of test optical signal is a pseudorandom sequence, and the waveform parameter of test optical signal is the length of the pseudorandom sequence.

3. The method according to claim 2, wherein:

after the step of the test module performing an optical time domain reflection test and obtaining data information of the test, the method further comprises;

after encapsulating the data information and the test parameters into data formats required by the optical fiber fault diagnosis, the test module sending the data formats to the fault diagnosis module.

4. The method according to claim 3, wherein:

the receiving module triggers the test module through an I2C management interface;

the test module sends encapsulated data to the fault diagnosis module through a serial data interface, and the serial data interface is one single-ended serial data interface or a pair of differential serial data interfaces.

5. The method according to claim 3, wherein:

the step of the test module encapsulating the data information and the test parameters into data formats required by the optical fiber fault diagnosis comprises;

encapsulating the test parameters into a frame header field, encapsulating the data information into a data field, adding a preamble field for identifying optical time domain reflection test data before the frame header field, and adding a check bit field after the data field.

6. The method according to claim 5, wherein:

the step of a fault diagnosis module analyzing the data information comprises;

if detecting that the preamble field is for identifying the optical time domain reflection test data and successfully checking data of the check bit field, according to the test parameters extracted from the frame header field, analyzing the data information in the data field.

7. The method according to claim 1, wherein:

after the step of a fault diagnosis module performing optical fiber fault diagnosis, the method further comprises;

reporting result information of the optical fiber fault diagnosis to an upper layer network management.

15. The method according to claim 2, wherein:

after the step of a fault diagnosis module performing optical fiber fault diagnosis, the method further comprises;

reporting result information of the optical fiber fault diagnosis to an upper layer network management.

16. The method according to claim 3, wherein:

after the step of a fault diagnosis module performing optical fiber fault diagnosis, the method further comprises;

reporting result information of the optical fiber fault diagnosis to an upper layer network management.

17. The method according to claim 4, wherein:

after the step of a fault diagnosis module performing optical fiber fault diagnosis, the method further comprises;

reporting result information of the optical fiber fault diagnosis to an upper layer network management.

18. The method according to claim 5, wherein:

after the step of a fault diagnosis module performing optical fiber fault diagnosis, the method further comprises;

reporting result information of the optical fiber fault diagnosis to an upper layer network management.

19. The method according to claim 6, wherein:

after the step of a fault diagnosis module performing optical fiber fault diagnosis, the method further comprises;

reporting result information of the optical fiber fault diagnosis to an upper layer network management.

8. An optical line terminal, the optical line terminal comprising a control module and an optical module;

wherein,

the control module is configured to;

control the optical module to send and receive services;

the control module comprises a receiving module and a fault diagnosis module, and the optical module comprises a test module;

the receiving module is configured to;

when receiving an optical fiber fault diagnosis message, send a triggering message to the test module;

the test module is configured to;

after receiving the triggering message, perform an optical time domain reflection test, and obtain data information of the test; and

the limit diagnosis module is c fig ed to;

analyze the data information, and perform optical fiber fault diagnosis.

9. The optical line terminal according to claim 8, wherein:

the test module is configured to perform the optical time domain reflection test in a following way;

performing the optical time domain reflection test according to preset optical time domain reflection test parameters, wherein the optical time domain reflection test parameters include;

the type of test optical signal, a waveform parameter of test optical signal, a sampling rate, analog-to-digital conversion bit width and sampling start time,

the type of test optical signal is an optical pulse, and the waveform parameter of test optical signal is the width of the optical pulse;

or, the type of test optical signal is a pseudorandom sequence, and the waveform parameter of test optical signal is the length of the pseudorandom sequence.

10. The optical line terminal according to claim 9, wherein, the test module comprises:

a transmitting control unit, configured to;

send a control command to an optical transmission unit according to the test parameters;

the optical transmission unit, configured to;

after receiving the control command, send a corresponding test optical signal to perform the optical time domain reflection test according to the type of test optical signal and the waveform parameter of test optical signal; and

a receiving processing unit, configured to;

after receiving the data information obtained through the optical time domain reflection test, and after encapsulating the data information and the test parameters into data formats required by the optical fiber fault diagnosis, send the data formats to the fault diagnosis module.

11. The optical line terminal according to claim 10, wherein, the data formats include:

a preamble field, a frame header field, a data field and a check bit field, wherein, the preamble field is for identifying bit stream information of optical time domain reflection test data, the frame header field includes the test parameters, and the data field includes the data information.

12. The optical line terminal according to claim 11, wherein,

the fault diagnosis module is configured to analyze the data information in a following way:

after detecting that the preamble field is for identifying the optical time domain reflection test data and successfully checking data of the check bit field, according to the test parameters extracted from the frame header field, analyzing the data information in the data field.

13. The optical line terminal according to claim 10, wherein, the optical module further comprises an I2C management interface and a serial data interface,

the test module receives the triggering message through the I2C management interface;

and

the test module sends encapsulated data to the fault diagnosis module through the serial data interface, and the serial data interface is one single-ended serial data interface or a pair of differential serial data interfaces.

14. The optical line terminal according to claim 8, wherein,

the fault diagnosis module is further configured to:

report result information of the optical fiber fault diagnosis to an upper layer network management.

20. The optical line terminal according to claim 9, wherein,

the fault diagnosis module is further configured to:

report result information of the optical fiber fault diagnosis to an upper layer network management.