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When bending the optical cable, the minimum bending radius cannot be exceeded.

1. Burial depth. Since the direct buried optical cable is directly buried under the ground, there must be a certain distance from the ground. With the help of the tension of the ground, the optical cable will not be damaged. At the same time, the optical cable should also be protected from freezing.

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Before laying the optical cable, the construction and related personnel should be properly trained on the matters that should be paid attention to in the construction, such as the essentials of laying out methods and safety, and ensure that the construction personnel obey the command.

In order to ensure the long-distance and low-loss application characteristics of optical transmission signals, an optical cable line must meet certain physical environmental conditions. Any slight bending deformation or slight pollution of the optical cable will cause the attenuation of the optical signal and even interrupt the communication.

1. The solution to environmental factors. First of all, it is necessary to determine whether hydrogen loss occurs in the outgoing optical cable. If hydrogen loss occurs, the attenuation degree can be judged by calculation, and compared with the margin reserved in the previous optical cable design. If the attenuation degree exceeds the margin, it needs to be replaced. If it is within the margin range, it can be maintained by formulating a plan. If the attenuation is caused by the physical characteristics of the optical cable itself, that is, the change of its own parameters with temperature increases, it is necessary to perform a window test, calculate according to the curve, and compare it with the design margin. If it exceeds the margin, it needs to be replaced.

Optical fiber is widely used in the field of communication because of its specific performance. Although the construction level of optical fiber cable has been significantly improved with the improvement of construction technology, there are still natural and artificial problems. This paper mainly expounds the common problems and countermeasures of optical cable construction for reference.

1. What are the causes of noise in optical fiber communication systems? There are noise caused by unqualified extinction ratio, noise caused by random variation of light intensity, noise caused by time jitter, point noise and thermal noise at the receiving end, mode noise of optical fiber, noise caused by pulse broadening caused by dispersion, and mode distribution noise of LD. , the noise generated by the frequency chirp of the semiconductor laser and the noise generated by the reflection.

1. How to limit the bending of optical cable? The bending radius of the optical cable is not less than 20 times the outer diameter of the optical cable, and not less than 30 times the outer diameter of the optical cable during construction (non-static).

1. What is the birefringence of a single-mode fiber? There are two orthogonal polarization modes in a single-mode fiber. When the fiber is not perfectly cylindrically symmetric, the two orthogonal polarization modes do not degenerate. The absolute value of the difference between two orthogonal polarization modes is birefringence.

1. What is the blind spot of OTDR? What is the impact on testing? How to deal with the dead zone in the actual test? Typically, a series of blind spots caused by saturation of an OTDR receiver is called a blind spot.

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1. What is the bandwidth of optical fiber related to? The bandwidth of the fiber refers to the modulation frequency when the amplitude of the optical power is 50% or 3dB lower than the amplitude of the zero frequency in the transfer function of the fiber. The bandwidth of an optical fiber is approximately inversely proportional to its length, and the product of the bandwidth length is a constant.

Optical fiber is the abbreviation of optical fiber. It is a fiber made of glass or plastic. It can transmit optical signals to thousands of kilometers away. Hundreds of thousands of optical fibers are combined together to make a cable-like optical cable. , so the optical cable is composed of a certain number of optical fibers, and the outer sheath is wrapped with a protective layer, which not only improves the strength of the optical fiber, but also greatly increases the communication capacity.

The concept of single-mode and multi-mode is the concept of multi-mode fiber and single-mode fiber propagation mode. The term "mode" is used to describe how an optical signal propagates within the glass core of an optical fiber. In single-mode fiber, light travels along one path; in multimode fiber, light travels in multiple paths.