Influence reasons of the optical fiber splicing loss
Formation reasons of the loss of optical fiber splicing loss mainly by optical fiber transmission loss and optical fiber welding the weld joint of loss.
Because of the influence of fiber connection quality optical fiber line guest limit, the transmission loss of optical fiber line WuZhongJi amplifier parameters such as transmission distance, so to reduce optical fiber fusion splicing loss as far as possible, to ensure that the optical fiber CATV signals transmission quality.
Loss in optical fiber communication, the first loss is made from fiber itself transmission loss and loss of fiber of welding joint.
The factors influencing optical fiber splicing loss more, such as those related to optical fiber itself and site construction.
Factors affecting the optical intrinsic factors is refers to the fiber itself.
Optical fiber mode field diameter is inconsistent;
Two optical fiber core diameter mismatch;
Fiber core section not round;
Poor fiber core and cladding concentricity.
Among them, the biggest influence is optical fiber mode field diameter, according to the CCITT (
The international telegraph and telephone consultative committee)
Advice, tolerance standard single-mode fiber are as follows: (mode field diameter
Plus or minus 10%, that is, tolerance to about + 1 microns;
Cladding diameter: 125 + 3 microns;
Mode field concentricity error of 6% or less, cladding out of roundness is 2% or less.
Extrinsic factors refers to the technology.
Axis misalignment: single mode optical fiber core is very fine, two docking fiber optic axis misalignment affect the connection loss.
1 when the dislocation.
2 microns, the loss of 0.
Axis: when optical fiber tilted section 1 °, about 0.
6 db in the loss, if the request succeeded loss 0 or less.
1 db, the single mode fiber Angle should be 0 or less.
End face separation: activities of the connector connection is not good, it is easy to produce face separation, the connection loss is bigger.
When welding machine discharge voltage is low, also prone to face separation, the situation in a tensile test can be found in the function of welding machine.
End face quality: optical fiber end face of the roughness is bad when also can produce loss, even bubbles.
Physical deformation: near the point of optical cable tensile deformation in the process of erection, in place of solid cable clamp pressure in the box is too big, etc. , will have an impact on in place of loss, and even can improve weld several times.
Other factors in the operation level and proficiency, the operation steps in the technology level, welding machine, disc fiber electrode clean degree, welding parameters, the working environment clean degree and so on all can affect the optical fiber