This paper introduces the research advance and technical level of low loss and ultra low loss single mode optical fiber.With the optical fiber stress as the starting point in the process of production

the relationship

such as the drawing speed

annealing furnace

inner coating modulus

coating dia meter

coating curing

between the key parameters and the ratio of low loss fiber are explored after a lot of trials.What’s more

the influence of the stress on optical fiber attenuation is analyzed

finally

it is confirmed that the ratio of low loss fiber will be increased significantly when the drawing speed is lower

the distance between the extension tube and the annealing furnace is 10 cm

the curing degree of the inner/outer coating is 93%/96%

and the diameter of the inner coating is about 192 μm and so on.In addition

the results have certain reference values for the attenuation stability of ultra-low loss fiber and the improvement of low loss ratio.