How to reduce optical fiber loss

Optical fiber connection transmission loss, that is, splice loss. At present, the factors of single-mode fiber connection loss are mainly analyzed through carrier-grade fiber optic connectors.

Carrier Grade Fiber Optic Connectors

1. Internal Factors

The single-mode fiber that has the greatest impact on connections is the mode field diameter. A loss of more than 0.2 dB occurs when the mode field diameter is mismatched by 20%. It is of great significance to use the optical fiber with smaller mode field diameter as much as possible to reduce the splicing loss.

2. External factors

The main factors for the loss of single-mode carrier-grade fiber optic connectors are axial misalignment and axial tilt. For mechanical connection, there are also factors such as longitudinal splitting and melting core deformation.

(1) Axial misalignment. When the misalignment reaches 1.2μm, the resulting loss can reach 0.5dB, which improves the accuracy of connection positioning and can effectively control the influence of axial misalignment.

(2) Axial tilt. When the tilt reaches 1°, there will be a loss of 0.2 dB. Use a high-quality fiber cleaver to improve the loss caused by axial tilt.

3. Core deformation

When the current, propulsion, discharge current and time of the automatic fusion splicer are set reasonably, the loss caused by the deformation of the fiber core can be less than 0.02 dB.