光子学报, 2020, 49 (3): 0306001, 网络出版: 2020-04-24
层压工艺对埋入光纤传输性能影响分析
Effect Analysis of Embedded Fiber Transmission Performance by Lamination Process
光纤埋入结构 层压工艺 有限元分析 单模光纤 最大应力 等效折射率 Optical embedded structure Lamination process Finite element method Single mode fiber Maximum stress Effective refractive index
摘要
针对层压工艺下,埋入挠性光电基板的光纤,其应力、位移的变化,会影响光路的耦合效率,改变光纤有效折射率,导致传输性能发生变化的问题,采用有限元分析软件,对光纤埋入不同槽型的挠性光电基板进行了力学、传热和电磁场耦合分析.分析结果表明:光纤埋入梯形槽挠性基板的应力最大,达到68.336 7 MPa.埋入梯形槽的光纤位移量最大,其值为1.430 4 μm.随着槽宽增加,光纤最大等效应力从52.667 MPa增加至71.907 MPa;随着槽间距增加,光纤最大应力从51.589 MPa增加至53.567 MPa;随着槽深增加,光纤最大应力从52.667 MPa减小至47.793 8 MPa,然后增加到67.349 6 MPa.随着温度和压力的增加,单模光纤在X方向的有效折射率从1.446 249 977增加至1.446 259 084;Y方向的有效折射率从1.446 326 398增加至1.446 393 041.光纤有效折射率差会随着温度的增加而增大,随着压力的增加而减小.光纤有效折射率增加,限制光的能力增加,能够有效地减小光纤弯曲损耗.本文分析结果对挠性光电基板光纤埋入结构设计和层压工艺具有一定的参考价值和指导意义.
Abstract
Aiming at the problem of the stress and the displacement of the fiber embedded in the flexible optoelectronic substrate can change, which affects the coupling efficiency of the optical path and the effective refractive index of the fiber which can result in the transmission performance to change under lamination process, he finite element method software was adopted to conduct coupling analysis of stress modules, heat transfer and electromagnetic field of fiber embedded flexible substrate. Simulation results show that the maximum stress of the fiber embedded in the trapezoidal groove flexible optoelectronic substrate was 68.336 7 MPa. The fiber displacement embedded in trapezoidal groove is 1.430 4 μm largest among the three types grooves. The maximum stress of the fiber increases from 52.667 MPa to 71.907 MPa with the increasing of groove width. The maximum stress of the fiber increased from 51.589 MPa to 53.567 MPa as groove spacing increases. The maximum fiber stress decreases from 52.667 MPa to 47.793 8 MPa firstly and then increases to 67.349 6 MPa with the increase of groove depth. With the increase of temperature and pressure, the effective refractive index of single-mode fiber in the X direction increased from 1.446 249 977 to 1.446 259 084 and increased from 1.446 326 398 to 1.446 393 041 in the Y direction. The difference of effective refractive index increases with the increas of temperature and decreases as the pressure increases. With the effective refractive index increases, the fiber core's ability to limit light energy increases which can better reduce the radiation of light energy and the bending loss of the fiber. The research conclusion has certain reference value and guiding significance for designing the embedded structure of flexible optoelectronic printed circuit boards.
佘雨来, 周德俭, 陈小勇, 杨旭, 涂闪, 赖华俊. 层压工艺对埋入光纤传输性能影响分析[J]. 光子学报, 2020, 49(3): 0306001. Yu-lai SHE, De-jian ZHOU, Xiao-yong CHEN, Xu YANG, Shan TU, Hua-jun LAI. Effect Analysis of Embedded Fiber Transmission Performance by Lamination Process[J]. ACTA PHOTONICA SINICA, 2020, 49(3): 0306001.