T/GDCKCJH 024-2020 Testing method for active single-mode optical fiber darkening effect

Scope

Scope: This standard specifies the terms and definitions, test conditions and requirements, and test methods for the laser darkening effect test of active single-mode fiber (ASF). This standard applies to the measurement of the darkening effect of ASF doped with rare earth elements induced by continuous laser irradiation or short-pulse laser irradiation, which results in a decrease in the output optical power or transmittance of ASF. However, it does not apply to the determination of the darkening mechanism. If the test results obtained by the optical power meter method and the transmittance method in this standard are inconsistent, the results obtained by the optical power meter method shall prevail. Main technical content: This standard is based on the fiber structure meeting the definition of single-mode fiber in the Chinese national standard GB/T 15972.10-2008. By detecting the changes in the output optical power or transmittance of the sample before, during, and after exposure to a certain laser power density/energy density, the darkening effect of ASF under strong laser irradiation is tested. The optical power meter method connects the active single-mode fiber with a length of L to the test power meter, records the initial optical power P0 output by the sample and the optical power PT output after irradiation for a certain time, and finally calibrates the power drop value with 10lg(PT/P0)/L. The transmittance method tests the initial transmittance T0 and the change in transmittance Tt with wavelength of the active single-mode fiber with a length of L after irradiation for a certain time, and calibrates the transmittance drop value with 10lg(Tt/T0)/L.

Development Information

Related Standards