Solutions for Fiber Application Loss

There are many reasons for optical fiber transmission loss. In the construction and maintenance of optical fiber communication network, the most important concern is the cause of transmission loss caused by the use of optical fiber and how to reduce these losses. The transmission loss caused by the use of optical fiber mainly includes splice loss (inherent loss of optical fiber, splice loss and movable splice loss) and non-splicing loss (bending loss and losses caused by other construction factors and application environment).

splice loss

The splicing loss of optical fiber mainly includes: the intrinsic loss caused by the intrinsic factor of the optical fiber, the splice loss and the movable joint loss caused by the extrinsic factor.

(1) The inherent loss of the fiber is mainly due to the inconsistency of the fiber mode field diameter; the mismatch of the fiber core diameter; the non-circular core section;

(2) The splice loss of the splice loss extrinsic factor is mainly caused by the axial dislocation; the axial center (folding angle) is tilted; the end face is separated (gap); the fiber end face is incomplete; the refractive index difference; Operation steps, cleanliness of welding machine electrodes, welding parameter settings, cleanliness of working environment and other factors.

(3) The movable joint loss of the extrinsic factor of the movable joint loss is mainly caused by the poor quality of the movable connector, poor contact, uncleanness and some factors that are the same as the welding loss (such as axial dislocation, end face gap, bending angle, refractive index difference, etc. )cause.

Fiber Application Loss

Solutions to Continuity Loss

(1) In engineering design, construction and maintenance, high-quality optical fibers with the same characteristics should be selected. One line should use the same batch of high-quality brand-name bare fibers as much as possible, so as to match the characteristics of the optical fibers as much as possible, so as to make the mode field diameter affect the fiber fusion loss. to a minimum.

(2) The construction of the optical cable should be carried out in strict accordance with the regulations and requirements

When matching disks, try to make the whole disk configuration (single disk ≥ 500 meters) to minimize the number of joints. When laying, lay out the cable tray number and terminal sequence strictly to minimize the loss value.

(3) Select experienced and well-trained connection personnel for connection and testing

The level of the splicing personnel directly affects the size of the splicing loss. The splicing personnel should strictly follow the optical fiber splicing process for splicing, strictly control the splice loss, and use an optical domain reflectometer (OTDR) to monitor the splicing process at all times (splicing loss ≤ 0.08dB/piece ), those that do not meet the requirements should be re-welded.

When using an optical time domain reflectometer (OTDR), the loss of the joint should be measured from two directions and the average of these two results should be calculated to eliminate the human factor error of a one-way OTDR measurement.

(4) Ensure that the connection environment meets the requirements

It is strictly forbidden to operate in the open air in a dusty and humid environment. The connecting parts of the optical cable, tools and materials should be kept clean, and the optical fiber connector should not be damp. The optical fiber to be cut must be clean and free of dirt.

The fiber should not be exposed to air for too long after cutting, especially in dusty and humid environment. When the ambient temperature is too low, the necessary heating measures should be taken.