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从电磁场基本理论出发,采用标量波动方程进行分析与计算,设计出了一种陆地长距离通信用G.654.E新型光纤的折射率剖面结构。然后采用连续化学气相沉积工艺制造出光纤预制棒,在2 100℃左右的高温下拉丝成包层直径为124.6μm的光纤。测试表明,该光纤的纤芯折射率为1.461 17,纤芯直径为14.0μm,内包层下凹环的折射率为1.455 65,宽度为6.96μm。该光纤在1 550nm波长的模场直径为13.85μm,有效面积为150μm2。该光纤在1 550nm波长的衰减为0.163dB/km,在1 625nm波长的衰减为0.176dB/km。22m光纤截止波长测试为1 490.6nm,小于1 510nm,有力保障了密集波分通信系统在光监控信道(OSC)的正常工作。国家通信干线工程应用表明该光纤的关键技术指标优于当前国际技术水平,能够满足陆地长距离大容量光纤通信的新需求。
Based on the basic theory of electromagnetic field, the scalar wave equation is used for analysis and calculation, and a refractive index profile structure of G.654.E novel optical fiber for long-distance land use is designed. Then, the optical fiber preform is manufactured by the continuous chemical vapor deposition process, and the optical fiber preform is drawn into the optical fiber with a cladding diameter of 124.6 μm at a high temperature of about 2100C. The test shows that the optical fiber has a core refractive index of 1.461 17, a core diameter of 14.0 μm, a depressed ring of an inner cladding of 1.455 65 and a width of 6.96 μm. The mode field diameter of the optical fiber at a wavelength of 1 550 nm is 13.85 μm and the effective area is 150 μm2. The fiber has an attenuation of 0.163 dB / km at a wavelength of 1550 nm and an attenuation of 0.176 dB / km at a wavelength of 1625 nm. 22m fiber cut-off wavelength test of 1 490.6nm, less than 1 510nm, effectively protect the Dense Wavelength Division Multiplexing optical communication system (OSC) in the normal work. The application of national communications trunk project shows that the key technical indicators of the optical fiber are superior to the current international technological level and can meet the new needs of long-distance large-capacity optical fiber communications on land.