Distributed temperature sensing optical fiber with large bandwidth

• Main Authors: YANG CHEN, LEI GAOQING, QIU SIYUAN, YU JIANGANG, ZHENG WEI
• Format: Patent
• Language: Chinese; English
• Published: 28.12.2021
• Subjects: MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

The invention relates to a distributed temperature sensing optical fiber with larger bandwidth. The optical fiber comprises a core layer and a cladding, the refractive index profile of the core layer is in parabolic distribution, and the distributed temperature sensing optical fiber is characterized in that the refractive index distribution index alpha of the core layer is 1.84 to 1.89, the radius R1 of the core layer is 30 to 32.5 mu m, the maximum relative refractive index difference delta 1max is 2.00 to 2.15%, the cladding is divided into an inner cladding layer and an outer cladding layer from inside to outside, the unilateral thickness W2 of the inner cladding layer is 0.2 to 2.0 [mu] m, the relative refractive index difference delta 2 of the inner cladding layer is -0.1% to -0.01%, the radius R3 of the outer cladding layer is 62 to 63 [mu] m, and the outer cladding layer is a pure silicon dioxide glass layer. According to the invention, not only is the bandwidth of the working wave band optimized, but