Passive optical network and optical network unit optical module thereof

Abstract

The invention discloses a passive optical network and an optical network unit optical module of the passive optical network. An optical network comprises an optical line terminal and an optical network unit, wherein the optical module of the optical line terminal is used for sending an optical signal of the first wavelength to serve the optical signal as a downlink optical signal, receiving an optical signal of the second wavelength to serve as an uplink optical signal, sending an optical signal of the third wavelength, wherein the optical signal of the third wavelength is used for detecting breakpoints and confirming the position of the breakpoints of an optical fiber. The optical module of the optical network unit is used for receiving the optical signal of the first wavelength, sending the optical signal of the second wavelength and reflecting the optical signal of the third wavelength. Due to the fact that the optical line terminator (OLT) can send and receive the optical signal of the third wavelength used for detecting the breakpoints when sending the uplink optical signal and the downlink optical signal are not influenced, the optical module of the optical net unit (ONU) can reflect the optical signal used for detecting the breakpoints to enable the detection of the breakpoints of the optical fiber to be convenient and not to influence the regular transmission of signals of the other optical networks without breakpoint position.

Description

technical field [0001] The invention relates to optical fiber communication technology, in particular to a passive optical network and an optical network unit optical module thereof. Background technique [0002] In the optical fiber communication system, the optical transmission medium, such as optical fiber / optical cable, is often laid on the outskirts or on the seabed, and problems such as link failure or transmission equipment failure are inevitable. In order to accurately locate the location of the failure or breakpoint, the optical Time domain reflectometer (OTDR) for breakpoint detection. [0003] in such as figure 1 In the optical fiber communication system shown, OLT (Optical Line Terminator, optical line terminal) is usually installed in the central office of the access network system of the optical fiber communication system, and the OLT is responsible for converting the electrical signal data in the switch into optical signal data and sending it out. And receiv...

AI Technical Summary

Problems solved by technology

[0006] In the existing optical fiber breakpoint detection method, the system network has to be disconnected first during the breakpoint detection process, and then connected to the OTDR for detection. The detection process is complicated, which makes the detection work of the detection personnel cumbersome

[0007] Moreover, during the detection period, it will also affect the normal transmission of signals of other networks without breakpoints

For example, in the above example, only the optical fiber between the spilter and ONU3 is broken. However, during the detection period, the OLT is disconnected from the network, which also causes the signal interruption of ONU1 and ONU2.

[0008] Therefore, in summary, the breakpoint detection method of the prior art will affect the normal transmission of the signals of other networks without breakpoints during the breakpoint detection process; and the detection process is complicated, making the detection work of the detection personnel cumbersome

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