To solve the splice loss, pay attention to the selection of high-quality optical fibers with consistent characteristics, strictly follow the requirements during construction, prepare perfect fiber end faces, correctly use the fusion splicer, etc. To solve the non-splice loss, pay attention to choosing the best laying method in the design and construction, and take practical measures. Take effective protective measures and pay attention to construction requirements, etc. The loss of different reasons should be carefully analyzed and different methods should be used to solve the loss of optical fiber fusion.
The loss of a splicing point of an optical fiber shall not exceed 0.5dB, and generally the splicing loss is below 0.3dB. Normal optical fibers are also lossy without fusion splicing points. The so-called loss of optical fiber loss refers to the attenuation per unit length of the optical fiber, and the unit is dB/km. In the case of commonly used wavelengths of 1310nm and 1550nm, the optical loss is required to be lower than 0.3dB/km.
The transmission loss characteristic of optical fiber is one of the most important factors to determine the transmission distance, transmission stability and reliability of optical network. There are many reasons for optical fiber transmission loss. In the construction and maintenance of optical fiber communication network, the most worthy of attention is the cause of transmission loss in the use of optical fiber and how to reduce these losses.
The transmission loss caused by the use of optical fiber mainly includes splicing loss (inherent loss of optical fiber, splicing loss and active joint loss) and non-splicing loss (bending loss and loss caused by other construction factors and application environment).
The splicing loss of the optical fiber mainly includes: the intrinsic loss caused by the intrinsic factors of the optical fiber, the fusion splice loss and the movable joint loss caused by the extrinsic factors.
The inherent loss of optical fiber mainly comes from the inconsistency of the mode field diameter of the fiber; the mismatch of the core diameter of the fiber; the non-circular cross section of the fiber core; The splice loss due to extrinsic factors of splice loss is mainly caused by axial misalignment; axis (folding angle) tilt; end face separation (gap); fiber end face is incomplete; refractive index difference; It is caused by other factors such as the cleanliness of welding machine electrodes, welding parameter settings, and cleanliness of the working environment.