We investigate the digital glass forming process for depositing commercial SMF-28 single-mode optical fiber for photonic purposes. The process utilizes a CO2 laser to locally heat the feedstock to fuse it onto a fused quartz substrate. We focus on how altering the deposition parameters, including the laser power, feed rate, and path plan, affects the deposited fiber morphology and how this affects the optical transmission. At high powers, the fiber bonds strongly to the substrate, resulting in significant changes in fiber morphology and core shape. With a gradient transition between the feedstock geometry and the deposition geometry, high optical transmission for straight line depositions can be achieved. Additional work was performed examining the optical losses when the fiber is deposited around a constant radius curve for different fiber morphologies, with higher losses recorded for higher power samples. Comparing the doping profile of these samples indicates that the gradient of Ge decreases at higher laser power, suggesting the losses are caused by diffusion of the fiber core. This work shows that for high input powers, the optical losses around curves are increased, leading to a tradeoff between the bonding strength and optical transmission for these geometries.

中文翻译：

---

光子学数字玻璃成型

我们研究了用于沉积用于光子目的的商用 SMF-28 单模光纤的数字玻璃成型工艺。该工艺利用二氧化碳激光器局部加热原料，将其熔合到熔融石英基板上。我们重点关注改变沉积参数（包括激光功率、进给速率和路径规划）如何影响沉积光纤的形态以及这如何影响光传输。在高功率下，纤维与基材牢固结合，导致纤维形态和芯形状发生显着变化。通过原料几何形状和沉积几何形状之间的梯度过渡，可以实现直线沉积的高光学传输。还进行了额外的工作，检查当光纤围绕不同光纤形态的恒定半径曲线沉积时的光学损耗，对于较高功率的样品记录了较高的损耗。比较这些样品的掺杂分布表明，Ge 的梯度在较高的激光功率下降低，这表明损耗是由光纤芯的扩散引起的。这项工作表明，对于高输入功率，曲线周围的光损耗增加，导致这些几何形状的粘合强度和光传输之间的权衡。