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Device and method for detecting time slot conflict between optical network units in optical network

A technology of optical network unit and network unit, which is applied in the field of optical communication network, can solve problems such as efficiency reduction, performance loss, increase in implementation complexity and degree, and achieve the effect of avoiding failure

Inactive Publication Date: 2008-02-27
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) The optical network unit laser is in a constant emission state, which may be caused by laser damage or malicious optical network unit configuration
[0009] 1) A new transmitter is required, including a secondary modulation subsystem at the optical network unit end and a demodulation subsystem at the optical fiber line terminal, which increases the complexity and degree of implementation;
[0010] 2) The additional modulation mode requires high linearity of the optical transmitter, and in the different scenarios shown in Reference 2, additional performance loss including efficiency drop will be introduced;
[0011] 3) When the laser cannot work, the secondary modulation subsystem may also fail to apply the ONU identifier to the optical carrier;

Method used

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  • Device and method for detecting time slot conflict between optical network units in optical network
  • Device and method for detecting time slot conflict between optical network units in optical network
  • Device and method for detecting time slot conflict between optical network units in optical network

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Embodiment Construction

[0034] Split Power Design

[0035] For most ONU release failure cases, the transmitter enters an error state and the laser cannot be turned off by the control signal. To avoid this failure altogether, a transmitter split power solution was proposed (many commercial power regulators support this feature, such as the LT1762). By sending a deactivate ONU_ID message, the power of the optical network unit transmitter can be turned off by the optical line terminal. The updated deactivation message is shown in Table 1 below.

[0036] Table 1 release optical network unit identifier message format

[0037] Release Optical Network Unit Identifier message

bytes

content

describe

1

ONU-ID

or

11111111

identifies the message to an ONU or the

There are optical network units. If broadcast to all

The message of the optical network unit, the ONU-ID is

0xFF.

2

00000101

"Deactivate Opti...

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Abstract

This invention provides a scheme used in testing time slot conflict of ONU in optical circuit terminals, when optical signals are still in up-line transmission after all ONU are deactivated, each ONU is informed to switch off the supply of its emitter to test if the ONU is faulty, when there are not optical signals in the up-line transmission after all ONU are deactivated, distance is measured to the ONU to find out the problem.

Description

technical field [0001] The invention relates to an optical communication network, in particular to a device and a method for detecting a transmitter fault or a time slot conflict in an optical network unit in a passive optical network. Background technique [0002] At present, the passive optical network access network is regarded as the best solution for the optical access network because of its high reliability, high bandwidth and low implementation, operation, management and maintenance costs. As shown in Figure 1a, the passive optical network is a typical point-to-multipoint network, in which all optical network units share the same optical fiber in uplink and downlink transmission. Since multiple optical network units (Optical Network Unit, ONU) are simultaneously connected to an optical line terminal (Optical Line Terminal, OLT), all optical network units use a shared time-domain multiplexing channel in the downlink transmission direction. In the uplink direction, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04B10/077
CPCH04B10/0779H04J3/1694H04B10/07H04B10/2581H04B10/27
Inventor 齐江于宏斌莫哈梅德·尼赞姆李强
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD