GB/T 15972.55-2009 "Specification for test methods for optical fibers, Part 55: Measuring methods and test procedures for environment performance - Hydrogen aging" specifies the hydrogen aging test method for optical fibers in hydrogen-containing environments, which is suitable for evaluating the hydrogen aging performance of B1.3 and B4 single-mode fibers. Test the performance change of optical fibers during aging by simulating the hydrogen environment. The standard provides a reference for the long-life performance evaluation of optical fibers, ensuring their Reliability in complex environments, suitable for quality control and performance verification of communication fibers.