A high stable length standard optical fiber

Abstract

The high-stable-length standard optical fiber of the present invention includes a temperature control system. A number of standard optical fibers are designed with a separate structure. First, the optical fiber is kept loose and wound on a metal plate with grooves. Lead out from the through hole of the metal plate, then place the heater in the center of the metal plate, and place the temperature sensitive element close to the standard optical fiber, then add thermal silica gel into the groove of the metal plate, and finally pass through the heat insulating material Wrap the metal plate and put it inside the case as a primary temperature control system. Then put the first-level temperature control system in the second-level temperature control system of the body. The second-level temperature control of the body can control the temperature accuracy to ±0.5°C, and the first-level temperature control of the standard optical fiber can reach ±0.05°C. Through the above methods, the high stability of the standard optical fiber length can be achieved, thereby meeting the traceability requirements of optical precision reflectometers.

Description

Technical field [0001] The present invention relates to the field of communications, 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 optical fiber transmission characteristics. At present, optical time domain is more commonly used. Reflectometer (OTDR). However, the resolution of OTDR is in contradiction with the signal-to-noise ratio, dynamic range, and measurement time. Its spatial resolution can only reach the order of meters, which cannot meet certain applications that require high-precision measurement. Optical precision reflectometers can be very good. Solve the contradiction between resolution and dynamic range. [0003] At present, the local area network ...

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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