Construction of large-capacity ribbon cable a few technical problems – fiber opt
With the global telecommunications network toward digital, broadband, intelligent direction, and a large-capacity ribbon cable as the main transmission medium of fiber access networks is accelerating construction of the user. The high-capacity optical fiber ribbon cable and the relay in the construction of single-core technology there are some differences.
1 large capacity vertical broken ribbon cable (the roof) technology
The past, mostly as a relay optical fiber, less likely to need to branch joints.
Ribbon optical fiber access network is characterized by the user to exchange points, multi-user, the exchange of points from the past, resulting in cable branch connector o'clock.
Cable in order to maintain the integrity of the fiber without branches, with the cable tray, they often use the whole disk configuration, the need to branch joint position, the remaining quantitative optical cable, ribbon cable using high-capacity vertical break (skylights) technology to follow. Vertical broken ribbon cable is a technology with the cable tray, the disc configuration in the use of the whole premise, the large-capacity ribbon cable connector from the need to branch location by the required size, first vertical broken cable jacket and sheath opened, remove the cable jacket and sheath; then dedicated vertical broken knife or surgical center of Longitudinal Shear will be opened, removed center beam tube, the fiber will be needed to bring the branch cut, and with the branches connected with fiber cable retain the fiber with and without branches for shelter. This technology can reduce the cable relay paragraph splice loss, reduce the probability of fiber failure, reduce the labor intensity of construction workers, saving machinery use and cost of connecting material.
The telephone office in Beijing Zhongguancun user fiber-optic network (southwest part) test was first introduced in Central and success in 1998 in Beijing fiber ring 100 generally promote the use of construction has made remarkable economic and social efficiency.
2 ring connected using welding machine
Large-capacity optical fiber ribbon cable access network ring, the cable branch connector more indicators continue to facilitate two-way cable testing, fiber optic cable connecting process, the test points are in the central office (at the intersection into the end of continuation, the test points to be connected at all junction points), in the other end was connected with a cable machine to weld the adjacent ring in turn connected with fiber.
The technology must be in strict accordance with the following fiber optic cable connecting the construction process.
(1) connecting the central office into Switzerland.
(2) the trunk or main branch through the first access by the first (start at one end by the central office in turn).
(3) main vertical branch of the first follow broken.
(4) the transition point into Switzerland then by (main indicators of the access points tested by qualified after all).
3 using OTDR refresh Xu style, continue to improve test speed
Fiber ribbon cable has great relevance, that continue after the completion along the splice loss test, if tested by the previous method (using the average of the processing of OTDR test), if the test before completion of 11 core indicators of compliance, However, 12 of the core failed, it must be cut to re-weld with welding fiber, which led to a lot of time spent on the test.
Refresh mode OTDR testing the use of short, while the average processing OTDR for testing the characteristics of a long time, continue the testing process in the first use of the refresh mode OTDR test (using wavelength 1550nm, can detect the splice loss and fiber with a bending radius is too small due to causes such as the additional loss). Refresh mode tests are normal, it will continue melting point tubes with hot-melt protection and shelter, then the average processing OTDR for testing and measuring the two-window (1550um, 1310um) parties to the attenuation index.
To further enhance the test speed, fiber optic cable ring as the access network the user the distance short, in testing Splice data, the ODF shelf, take time series with six fibers, each with twice the test method curve can be read the same test multiple joint points attenuation data (You can automatically or manually identified shift linkage function, measured by the connecting point of attenuation), thus reducing the number of tests.
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