Thermally Stable, Low Loss Optical Silicones: A Key Enabler for Electro-Optical Printed Circuit Boards
Thermally Stable, Low Loss Optical Silicones: A Key Enabler for Electro-Optical Printed Circuit Boards
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热稳定、低损耗光学有机硅：电光印刷电路板的关键推动者
DOI：
10.1109/jlt.2014.2358794
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发表时间：
2015
影响因子：
4.7
通讯作者：
F. Betschon
中科院分区：
文献类型：
--
作者：
R. John;Chad Amb;Brandon W. Swatowski;W. Weidner;M. Halter;T. Lamprecht;F. Betschon
我们报告了一种具有聚硅氧烷主链的低损耗聚合物波导材料的开发和表征，该材料用于新一代电光印刷电路板（PCB）。该聚合物在850 nm处具有<0.05 dB/cm的低光损耗和低残余应力，可承受PCB集成过程中苛刻的可靠性要求。聚合物的热机械性能被调整为在环境空气中在25 °C至200 °C的温度范围内表现出约IMPa的残余应力。使用聚硅氧烷聚合物制造多模聚合物波导，并将其嵌入六层PCB架构中，该PCB架构在288 °C下在焊料浴中进行层压、通孔钻孔、电镀和IPC冲击测试（浸泡）。制造了八个长度为1.2 m的多模聚合物波导螺旋通道，并在波导制造、层压和回流焊后测量了插入损耗。作为PCB制造工艺函数的插入损耗偏差小于3%，回流焊后的最终插入损耗为0.052 +/- 0.002 dB/cm。这一发现提出了一种光波导材料，当其嵌入使用工业标准工艺制造的PCB中时，满足可靠性要求，同时保持光学性能。
We report the development and characterization of a low loss polymer waveguide material with a polysiloxane backbone for enabling the new generation electrooptical printed circuit boards (PCBs). The polymer was designed to have low optical loss of <;0.05 dB/cm at 850 nm and low residual stress to withstand the harsh reliability requirements during PCB integration. The thermomechanical properties of the polymer were tuned to exhibit a residual stress of ~1 MPa over a temperature range of 25 °C to 200 °C in ambient air. Multimode polymer waveguides were fabricated using the polysiloxane polymer and embedded in a six-layer PCB architecture that was subjected to lamination, through-hole via drilling, plating, and IPC shock test (immersion) in solder bath at 288 °C. Eight channels of multimode polymer waveguide spirals of length 1.2 m were fabricated and the insertion loss measured after waveguide fabrication, lamination, and solder reflow. The deviation in insertion loss as a function of the PCB fabrication process was less than 3% with final insertion loss after solder reflow being 0.052 +/- 0.002 dB/cm. This finding presents an optical waveguide material which when embedded in a PCB fabricated using an industry standard process meets reliability requirements while maintaining optical performance.