Method for testing stimulated Brillouin scattering gain coefficient of passive transmission fiber

• Main Authors: QIU JIAXIN, WANG PIAOPIAO, GU SHAOYI, GUO AIJIN, RONG LIANG, REN JUNJIANG
• Format: Patent
• Language: Chinese; English
• Published: 22.11.2022
• Subjects: MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

The invention relates to the field of optical fiber testing. The technical problem to be solved is to provide a method for testing the stimulated Brillouin scattering gain coefficient of a special passive transmission fiber with a large core diameter. A light source is used for stably outputting laser to a first port of a circulator with three ports, a second port of the circulator is connected with a to-be-measured optical fiber in a fusion welding mode, and optical fibers of other ports of the circulator all adopt passive optical fibers of the same type as the to-be-measured optical fiber; respectively measuring return optical power and output optical power at the third port of the circulator and the output end of the optical fiber to be measured by using an optical power meter; and when the power of the return light is equal to 1% of the fiber entering power of the injected light at the front end of the to-be-measured optical fiber, the fiber entering power of the injected light at the front end of the to-