Field testing of fiber link and the fault point location – light chain, the poin
Optical fiber communication technology become increasingly wide variety of raw materials manufacturing fiber more and more fiber Make Process technology to break new ground. New varieties and new fiber structure emerging, constantly improve product quality. A complete fiber-optic link performance depends not only on the quality of fiber, also depends on the quality of connectors and construction techniques and site environment.
With the rapid development of optical fiber communication technology, based on FTTH in Broadband Optical fiber communication network will become a new hot spot. Fiber is by far the best transmission medium, optical fiber access technology and other access technologies (such as copper twisted pair Coaxial cable ) Compared to the maximum advantage of available bandwidth is large. Optical access network have a good transmission quality, transmission distance is long, strong anti-interference, network reliability, saving resources, pipeline characteristics, where the driving force is the development of FTTH.
Optical fiber communication technology become increasingly wide variety of raw materials manufacturing fiber more and more fiber production process technology to break new ground. Fiber structure of the new varieties and new emerging product quality continuously improved. However, a complete fiber-optic link performance depends not only on the quality of fiber, also depends on the quality of connectors and construction techniques and site environment. Therefore, field tests for the fiber link is necessary.
1. The purpose of field testing fiber-optic link
Fiber link installation and maintenance field test is a necessary part of the fiber optic network is to ensure cable support for network protocols you plan to use an important way. Its main purpose is to follow a specific standard test fiber optic system to connect the quality and reduce the failure factors and the existence of a failure to identify the point of failure of fiber, which further reason to find fault.
2. Fiber link field test standards
Currently field testing the standard fiber link is divided into two categories: fiber system standards and application standards.
(1) Fiber Optic System Standard Fiber system standard is independent of the application of the fiber link field test. For different optical systems, its test limit is not fixed, it is based on cable length, Adapter And the junction of the variable standard. Most field testing fiber-optic link using this standard. Worldwide accepted standards are: North America, EIA / TIA? 568? B standard of ISO/IEC11801 and ISO standards.
(2) standard fiber-optic applications Standard optical fiber applications is based on the specific application of installation of fiber optic fiber link site identification test. Each different fiber systems in the test standard is fixed. Commonly used in fiber optic applications are: 100BASE? FX, 1000BASE? SX so.
3. Fiber Link Field Test For fiber systems need to ensure that the signal received at the receiving end should be large enough, due to optical fiber transmission data using optical signals, so it does not produce magnetic fields, there could not be electromagnetic interference (EMI) and radio frequency interference (RFI), do not need to test the parameters of the NEXT, so the test is different from the optical system of copper wire system testing.
In fiber applications, many different types of fiber, but fiber and its system of basic test parameters are roughly the same. In field testing fiber-optic link, the main optical properties of optical fiber and transmission properties were measured. Optical properties and transmission characteristics of optical fiber communication systems operating wavelength, transmission rate, transmission capacity, transmission distance and signal quality has a significant impact. However, fiber dispersion, cutoff wavelength, mode field diameter, base-band response, numerical aperture, the effective area, sensitivity and other features slightly curved from the harmful effects of installation methods, they should test the fiber manufacturer, without on-site test.
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