Zte Corporation

Jinsong Bei

Mingsheng Li

Liquan Yuan

Dan Geng

Yong Guo

Jie Su

Jidong Xu

Jianxin Lu

Provided are a ranging method and a communication method for an optical network, an Optical Line Terminal (OLT), an Optical Network Unit (ONU), and an optical network system. The OLT sends a broadcast message to the ONU, the broadcast message being used to indicate an uplink bandwidth allocated to the ONU. The OLT opens a quiet window for the ONU in a predetermined region. The OLT receives an uplink signal sent by the ONU at the quiet window.

Ranging method and communication method for optical network, OLT, ONU, and optical network system

The disclosure provides a method and a system for detecting a fiber fault in a Passive Optical Network (PON). The system comprises an optical path detection device, a Wavelength Division Multiplexing (WDM) coupler, a wavelength selection coupler, a branch fiber selector and a wavelength selection router. The detection system is attached to an original PON system, without influencing the operation of the original system while performing the detection. With the disclosure, the problem of being unable to determine whether there is a fault in a branch fiber due to the loss of an optical path detection reflection signal is solved, the branch fiber with a fault can be quickly located and fixed, thus the operational and maintenance costs of an operator are reduced.

Method and system for detecting fiber fault in passive optical network

The present invention discloses a passive optical network system based on wavelength protection and the protection backup method thereof. It comprises an optical line terminal (OLT) with two interface circuits, two trunk lines, an optical splitter network, multiple branch lines and optical network units (ONU), each of which is with two interface circuits. The two interface circuits of the OLT transmit downlink optical signals with different wavelengths, while the two interface circuits of the ONU transmit uplink optical signals with different wavelengths. Each trunk line is set with a wavelength division multiplexing (WDM) device and it can only pass the uplink and downlink signals of the connected interface circuits. Each branch line includes a branch optical fiber and a WDM device that is used to transmit two downlink signals to the corresponding interface circuits respectively and meanwhile transmit uplink signals from the two interface circuits as well, so as to form two active/backup bidirectional optical paths between the corresponding interface circuits of the OLT and the ONU. The cost of setting up the system in the present invention is low, but the system can provide hot backup protection for the trunk optical fiber and the OLT.

Passive optical network system based on a wavelength protection and protecting backup method thereof

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Shenzhen, China

Jinsong Bei