光子晶体光纤拉制中工艺参数的控制

分析了光子晶体光纤拉制中各工艺参数之间的相互影响，建立了工艺参数与最终光纤结构之间的对应关系.在温度和送料速度的协调控制下，通过调节气压参数可有效控制气孔结构.实验拉制出孔径孔距比分别为0.45和0.8的单模以及高占空比光子晶体光纤.在制备非均匀孔径光子晶体光纤时，仅靠调控工艺参数往往难以拉制出理想结构，本文以一种单偏振单模PCF结构为例，对预制棒结构进行了优化设计.计算表明可由此拉制出满足要求的光子晶体光纤.关键词：光子晶体光纤工艺参数气压控制气孔结构

Control of the fabrication parameters during the fabrication of photonic crystal fibers

The interplay between the fabrication parameters during the fabrication of photonic crystal fibers（PCF） are numerically analyzed. Relation between these parameters and the final fiber’s geometry is identified. With the cooperative control of drawing temperature and feed speed, the final hole structure can be effectively controlled by tuning the applied pressure. A single-mode PCF with its d/Λ approaching 0.45, and a PCF with high air-filling fraction, whose d/Λ equals 0.8, are successfully fabricated. For fabrication of PCFs with uneven-sized holes, parameter control alone is sometimes inadequate in achieving the desired geometry. Taking a single-polarization single-mode（SPSM） PCF structure as example, the preform’s geometry is redesigned for optimization by inverse calculation. And the required SPSM PCF can thus be fabricated.