少模多芯光纤的纤芯排布方法

Core Arrangement Method for Few-mode Multi-core Fibres

提出一种3模12芯光纤的纤芯排布优化方法.在分析芯间串扰、弯曲半径阈值和相对纤芯多重性因子等特性后,给出了单圆形结构和方点阵结构的纤芯排布方法及优化方案.对于单圆形结构,在波长为1 625nm的情况下很难找到合适纤芯排布以使芯间串扰小于-30dB/100km并且使光缆截至波长小于1 530nm.对于方点阵结构,在波长为1 625nm,且弯曲半径大于弯曲半径阈值时,可使芯间串扰小于-30dB/100km,最大光缆截至波长不大于1 530nm,纤芯多重性因子可达到~15,这表明方点阵结构是一种比单圆形结构更适合3模12芯光纤的纤芯排布结构.

An optimizing method for the core arrangemnt of three-mode twelve-core fiber was proposed.After investigating the characteristics such as inter-core crosstalk, threshold value of bending radius and Relative Core Multiplicity Factor （RCMF）, the optimized scheme for One-Ring Structure （ORS） and Square-Lattice Structure （SLS） were presented.For ORS, it is hard to find an appropriate core deployment to meet both requirements that crosstalk is not higher than -30 dB/100 km at the wavelength of 1 625 nm and the cable cutoff wavelength is not larger than 1 530 nm.For SLS, crosstalk can be lower than -30 dB/100 km after bending radius being larger than the threshold value, maximum cutoff wavelength is not larger than 1530 nm and RCMF can reach -15 at the wavelength of 1625 nm, which indicates that SLS is a more suitable core arrangement than ORS for the three-mode twelve-core fiber.