How Can Fiber Reflector Be Used in PON Network Link Monitoring?
In the PON (passive optical network) network, especially in the complex point-to-multipoint PON ODN (optical distribution network) topology environment, the rapid detection and diagnosis of optical fiber faults have become challenging work.
Although optical time-domain reflectometer (OTDR) tools are widely used at present, OTDR detection is sometimes not particularly sensitive to the attenuation of optical signals at the ends of some ODN branch fibers or ONU fibers.
Installing a low-cost wavelength-selective fiber reflector on the ONU side is often used at present, through which accurate detection of the end-to-end attenuation of the optical link can be achieved.
1. The working principle of fiber grating reflectors
The
test light pulse sent by the OTDR is mainly reflected back with a
reflectivity of nearly 100% by using the fiber grating, while the
working wavelength of a normal passive optical network (PON) system
passes through the reflector with little attenuation because it does not
satisfy the Bragg condition of the fiber grating.
The main function of this is to accurately calculate the return loss value of the reflection event at the end of each ONU branch by detecting the existence of the reflected OTDR test signal and the intensity of the optical signal. Thus, it tells whether the optical link from the OLT side to the ONU side is normal. In this way, real-time monitoring of fault points and fast and accurate diagnosis is realized.
By flexibly deploying the position of the fiber grating reflector and identifying different ODN sections, the detection and location of the ODN fault point and the cause analysis can be quickly realized, which can reduce the fault processing time and improve the test efficiency and maintenance quality.
In the first-level splitting scenario, if the return loss of the reflector of a certain fiber branch of the home increases significantly compared with the return loss value of the health file, it indicates that there is a problem with the optical fiber link of this branch. If all the fiber branches installed with fiber reflectors have an obvious return loss increase at the same time, it indicates that the main fiber is faulty.
In the secondary optical splitting scenario, the difference between return losses can also be used to accurately locate whether the attenuation fault has occurred in the distribution fiber segment or the home fiber segment. Whether it is a first-level or second-level splitting scenario, since the reflection peak will drop sharply at the end of the OTDR test curve, the return loss value of the longest branch link in the ODN network may not be accurately measured and it is necessary to measure the fiber reflection.
2. The characteristics of fiber grating reflectors
FBG
reflectors can be conveniently placed in series at the end of the user.
It has the characteristics of long life, stability and reliability,
convenient connection of adapter structure, and so on. This is one of the
reasons why fiber reflectors are the ideal optical end choice for FTTx
network link monitoring.
As a fiber optical accessories supplier, T&S Communications takes a leading role in OEM and ODM service for optical fiber termination solutions. Based on T&S Communications’ excellent comprehensive capabilities, T&S Communications is dedicated to bringing fiber optical components with superior performance to next-generation communications in a green, pragmatic, and cost-effective manner.
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How Are Fiber Optic Reflectors Applied to PON Network Link Monitoring?
In the PON (Passive optical network, passive optical network) network, especially the complex point-to-multipoint PON ODN (Optical distribution network, optical distribution network) topology environment, the rapid monitoring and diagnosis of optical fiber faults has become challenging work.
What is Passive Optical Network (PON) ?
A passive optical network (PON) is a fiber optic network that uses a point-to-multipoint topology and optical splitters to transmit data from a single transmission point to multiple user endpoints. Passive here refers to the unpowered state of the fiber and its splitting/combining components.
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描述- 深圳太辰光通信股份有限公司成立于2000年，于2016年12月在深圳证券交易所创业板上市，证券代码300570，公司的主营业务为各种光通信器件及其集成功能模块的研发、生产和销售。光通信器件主要包括高密度光纤连接器、常规光纤连接器件、PLC光分路器、波分复用器等无源光器件、光模块、有源光缆等有源光器件以及陶瓷插芯、MT插芯，平面光波导晶圆和芯片等基础元器件。
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FBG Reflector is the Ideal Optical End for FTTX Network Link Monitoring
The fiber grating fiber optic reflector utilizes the wavelength-selective properties of the fiber grating and the fiber grating is embedded in the adapter. It can be installed at the front end of the ONU and cooperates with the OTDR to realize the fault detection of the optical network.
What are the Features of FBG Reflector?
By installing the fiber optic reflector at the optical fiber connection end, the maintenance efficiency of the FTTH network is improved and the cost is lower. FBG fiber optic reflector is an ideal choice for optical fiber line monitoring and can be widely used in FTTX network, PON network, central computer room reflectivity test, communication system link detection, etc.
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