一种高质量最小波长的超低损耗锥形光纤设计（英文）

The Design of a High Quality and Minimum Wavelength of Ultra-low-loss Tapered Optical Fiber

采用火焰刷法对单模光纤进行加热拉锥,形成具有微纳米量级纤芯半径的光波导结构,并引入不同的绝热系数对低损耗锥形光纤进行优化,使其满足绝热标准.设计出恒定锥角为2 mrad、波长为400μm、纤维半径为4μm具有最佳形状的低损耗锥形光纤.Matlab仿真结果表明,23mm长的低损耗锥形光纤传输透视率为99.7%,63mm长的低损耗锥形光纤抗辐射能力达到99.6%.由于功率被耦合到高阶模式,其损失被充分抑制,具有恒定锥角的锥形光纤可以实现不牺牲传输质量的光耦合传输.

The single-mode fiber was heated tapering by flame brush method, forming an optical waveguide structure which has a core radius of micro-nanometer level, and the low-loss optical fiber tapered was optimized by the different coefficients of thermal insulation to meet insulation standards. The tapered optical fiber with the best shape was designed, whose constant cone angle is 2 mrad, wavelength is 400 μm and fiber radius is 4 μm. Matlab simulation results show that, the transmission perspective of tapered optical fiber with length of 23 mm is 99.7%, the radiation resistance of tapered optical fiber with length of 63mm is 99.6%. Since the power is coupled to the high-order mode, the loss is sufficiently suppressed, so that the optical coupling transmission of the tapered fiber with a constant taper angle can be achieved without sacrificing the quality of the transmission.