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提出了一种新型三角芯抗弯曲大模场面积光子晶体光纤.该结构采用单一尺寸的圆形空气孔,降低了制作难度.在波长1.064μm处,在平直状态和弯曲半径为30 cm时,模场面积分别为1386μm2和1153μm2,弯曲带来的模场面积减少量仅为16.85%.当弯曲半径为30 cm时,基模的损耗为0.087 dB/m,二阶模的损耗大于1.5 dB/m,大的损耗差有效保证了光纤单模运转.此外,弯曲半径30 cm时,弯曲方向角扩展至±180,光纤弯曲不再受弯曲方向的限制.所设计的光纤结构具有大模场面积、小的模场面积减少量、低的弯曲损耗以及低的弯曲方向敏感度等优势,为小型化、集成化高功率激光传输及光纤激光器和放大器的研究奠定了基础.
A new type of triangular anti-bending photonic crystal fiber with large mode-field-area is proposed. The structure uses a circular aperture with a single size to reduce the fabrication difficulty. At a wavelength of 1.064μm, at a flat state and a bending radius of 30 cm , The area of mode field is 1386μm2 and 1153μm2, respectively, and the reduction of mode field caused by bending is only 16.85% .When bending radius is 30 cm, the loss of fundamental mode is 0.087 dB / m and the loss of second mode is more than 1.5 dB / m, a large loss of fiber loss effectively ensure the single-mode operation of the fiber.In addition, bending radius of 30 cm, the bending direction angle extended to ± 180, the bending of the fiber is no longer limited by the bending direction.The designed fiber structure has a large mode field Area, small reduction of mode field area, low bending loss and low bending direction sensitivity, which laid the foundation for the research on miniaturization, integrated high power laser transmission and fiber laser and amplifier.