Optical cable bending test

There is natural loss when optical signals are transmitted in optical fibers. Light cannot make small turns and the bending angle cannot exceed 90 degrees. Once there is a breaking point, the optical signal intensity will immediately plummet at this point, even causing the optical signal to be blocked. The optical cable bending test determines the minimum ring diameter at which the optical cable begins to bend.
Zhongke Testing Reliability Experiment Center has the mechanical properties of various optical cables and provides professional bending test services for optical cables.

1. According to different transmission performance, distance and purpose, optical cables can be divided into user optical cables, local optical cables, long-distance optical cables and submarine optical cables.
2. According to the different conditions of transmission conductors and media, optical cables can be divided into metal-free optical cables, ordinary optical cables, and comprehensive optical cables (mainly used for railway dedicated network communication lines).
3. According to different laying methods, optical cables can be divided into pipeline optical cables, direct buried optical cables, aerial optical cables and underwater optical cables.
4. According to different structural methods, optical cables can be divided into flat structure optical cables, layered optical cables, skeleton optical cables, armored optical cables and high-density user optical cables.

1. Form the sample into a ring. Slowly pull both ends of the specimen to reduce the diameter of the ring until it bends. The two tension forces applied to the bottom of the ring should be in one plane.
2. When it starts to bend, stop pulling. 3. Measure the length C of the ring-shaped optical cable segment formed by the starting and ending ends of the intersection. Use formula (1) to calculate the equivalent ring "diameter" d.
d=C/π……………………(1)

GB/T 7424.21-2021 General Specification for Optical Cables Part 21: Basic Test Methods for Optical Cables Mechanical Performance Test Methods
IEC 60794-1-21: 2020 General Specification for Optical Cables Part 21: Basic Test Methods for Optical Cables Mechanical Performance Test Method
BS EN IEC 60794-1-2-2021 Optical fiber cables Part 1-2: General specifications Basic optical cable test procedures General rules
DS/EN IEC 60794-2-21-2021 General Specification for Optical Cables Part 21: Basic Test Methods for Optical Cables Mechanical Performance Test Method
LST EN 60794-1-21-2015 Optical cables Part 1-21: General specifications Basic test procedures for optical cables Mechanical test method
DIN EN 60794-1-21-2021 Optical fiber cables Part 1-21: General specifications Basic optical cable test procedures Mechanical test method
KS C IEC 60794-1-1-2007 Optical cables Part 1-1: General specifications General
GB/T 7424.2-2008 General specification for optical cables Part 2: Basic test methods for optical cables