Standard fiber of high stable length

Abstract

The invention relates to a standard fiber of high stable length. The fiber comprises a temperature control system, multiple standard fibers are designed in a separated structure, the fibers are kept in a loose state and wound around a metal plate with a groove, tail fibers of the fibers at the two ends are led out of through holes of the metal plate, heaters are placed at central positions of the metal plate, temperature sensitive elements are placed at positions close to the standard fibers, heat-conductive silica gel is added into the groove of the metal plate, the metal plate wrapped in a heat insulation material, and the metal plate and the heat insulation material are placed in a cabinet and serve as a primary temperature control system. The primary temperature control system is placed in a secondary temperature control system of a main body, the secondary temperature of the main body can reach the temperature control precision of + / - 0.5 DEG C, and primary temperature control of the standard fibers can reach + / -0.05 DEG C. Thus, the length of the standard fibers is highly stable, and magnitude tracing requirement of an optical precise reflectometry can be met.

Description

technical field [0001] The invention relates to the field of communication, in particular to an optical fiber. Background technique [0002] With the rapid development and application of optical fiber communication technology, it is particularly important to ensure the safety and smoothness of optical fiber communication. In the process of maintaining optical fiber communication, it is necessary to have instruments that can accurately measure the transmission characteristics of optical fiber. At present, the optical time domain is used more. Reflectometer (OTDR). However, there are contradictions between the resolution of the OTDR and the signal-to-noise ratio, dynamic range and measurement time. Its spatial resolution can only reach the meter level, which cannot meet certain applications that require high-precision measurement, while optical precision reflectometers can perform well. Solve the contradiction between resolution and dynamic range. [0003] At present, the lo...

AI Technical Summary

Problems solved by technology

[0006] (1) The standard optical fiber does not have a temperature control circuit, so it is impossible to accurately control the temperature of the optical fiber, so it cannot meet the high-precision traceability requirements of optical precision reflectometers;

[0007] (2) The standard optical fiber does not fix the optical fiber, and the length value of the standard optical fiber will be affected by the external force during carrying or transportation;

[0008] (3) The standard optical fiber can only meet the traceability requirements of the optical time domain reflectometer, but cannot meet the traceability requirements of the optical precision reflectometer

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