Device and method for monitoring optical fiber network
An optical fiber network and monitoring device technology, applied in the field of optical fiber networks, can solve problems such as inability to distinguish events, inability to distinguish two optical paths, and difficulty in distinguishing
Inactive Publication Date: 2009-11-04
IND TECH RES INST
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[0004] However, on these two optical paths with similar lengths, such as the OTDR traces of paths 6 and 7, it is slightly difficult to distinguish the two due to the influence of the blind zone of the OTDR. If the optical path length increases, it is necessary to use longer pulses. OTDR signal detection, the blind area will increase, and the two optical paths of 1.54 and 1.67 kilometers cannot be distinguished
When an event occurs on one of the two optical paths, monitoring using traditional methods will not be able to distinguish which optical path the event occurred on
In addition, using traditional methods to monitor, since the reflected light of all optical paths will be superimposed and displayed on the same OTDR trace, it is still impossible to measure the characteristics of optical fibers on individual optical paths, such as transmission loss, etc. Therefore, it is necessary to develop new monitoring technologies to solve the problem. Discrimination and discrimination problems
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[0045]The monitoring method of the optical fiber network provided by the present invention is mainly applied to the optical fiber network of the optical fiber with a plurality of branch optical paths, such as a passive optical network, and this optical fiber network may have an optical line terminal (OLT) and multiple optical networks The optical network terminal equipment of the terminal (ONT), and the optical line terminal is respectively connected to each optical network terminal through an optical fiber with multiple branch optical paths, and an optical filter capable of filtering different corresponding wavelengths is set on each branch optical path of the optical fiber network The front end, and use the optical signal with each corresponding wavelength to be input into each branch optical path in sequence, so that each optical signal is filtered by different optical filters, and then the optical signals reflected by each branch optical path are sequentially received, and t...
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The method comprises: setting the filter capable of filtering light waves in different wave lengths at the front end of each branch optical path in an optical fiber network; sequentially inputting the optical signals corresponding to different wave lengths into each branch optical path, and then analyzing the optical signals reflected from each branch optical path to identify the state of each branch optical path. The invention is designed for use in solving the problem of the interference between multi branch paths when making an optical fiber quality testing.
Description
technical field [0001] The invention relates to an optical fiber network, in particular to a monitoring device and method for an optical fiber network capable of judging individual states of branch optical paths. Background technique [0002] At present, Passive Optical Network (PON) is undoubtedly the most popular technology in Optical Access Network (Optical Access Network), but there is still no breakthrough in the monitoring technology of optical fiber quality. At present, the direct use of traditional optical time-domain reflectometry (Optical Time-Domain Reflectometry, OTDR, for convenience, hereinafter abbreviated), will cause the problem of indistinguishable between individual branch optical paths (Branch), especially in the branch optical path of similar length In terms of identification, due to the influence of OTDR dead zone (DeadZone), it still cannot be solved at present. This is because the optical pulses used by OTDR for monitoring can enter the optical fiber...
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IPC IPC(8): H04B10/08H04B10/12H04B10/071
Inventor 郭萓侑
Owner IND TECH RES INST