During the stretching process of optical cable, the fiber will be subject to tensile strain, which will significantly affect the transmission performance of the fiber. Specifically, the refractive index, bandwidth, and curvature of the fiber change. The tensile strain can change the refractive index of the fiber, which affects the signal transmission effect and change the mode coupling factor of the fiber, reduce the bandwidth and affect the transmission quality.
Additional attenuation
Optical cable stretching will cause strain of the optical fiber, resulting in additional attenuation. Additional attenuation is a common problem in optical cable transmission, mainly caused by the following reasons: fiber core asymmetry, strain, and joint error. The asymmetry and strain of the core can cause additional loss of the fiber at the joint, and the error at the joint will increase the loss of transmission signal.
Optical cable performance
The tensile performance of optical cable has an important impact on its long-term use performance and reliability. Suitable tensilestrain requirements can improve the performance and long-term reliability of the optical cable without increasing the cost. There are differences in tensile performance requirements between international standards and domestic standards. International standards have relatively loose requirements for optical fiber strain, while domestic standards are more stringent.
Optical cable standard
In China's current standard, the short-term and long-term tensile force value requirements of optical cable are different. The maximum strain allowed by the fiber is 0.6% and 0.2% under long-term tension. These standards are designed to ensure that the cable can withstand a certain amount of force in long-term working conditions, but too much tension will affect the service life of the cable.
To reduce the impact of optical cable stretching on the optical fiber, the following measures can be taken.
Optimization of cable forming process
By controlling the cable forming equipment and process, ensure that the cable can withstand tensile force during manufacturing, laying and use without affecting its performance.
Reasonable design of optical cable structure
Consider the residual length and prebias of optical fiber in the design of optical cable to reduce the influence of stretching on optical fiber.
Use high quality materials
Select high quality optical fiber and optical cable materials to ensure good performance during stretching.
Through the above measures, can effectively reduce the impact of optical cable stretching on optical fiber, to ensure the stability and reliability of optical cable in various application scenarios.