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S形弯曲波导是集成光器件中不可缺少的部分。在光开关阵列、星形耦合器以及阵列波导光栅等器件中,以及将多个元件集成到一个芯片上时,都需要很多的S形弯曲波导来实现波导的侧向位移和连接。其尺寸和损耗直接影响整个器件的损耗以及集成密度。弯曲波导插入损耗(不包括由于结构缺陷而产生的光的散射损耗)由两部分组成纯弯曲损耗和过渡损耗。从弯曲损耗产生的机理入手,提出用B样条泛函逼近理论实现任意边界条件下S形的优化方法,得到纯弯曲损耗尽可能小,并消除与直波导相连处过渡损耗的S形波导。且与正弦、余弦和双圆弧曲线得到的S形进行对比,用光束传播法验证。结果表明优化曲线插入损耗明显小于双圆弧和余弦曲线。
S-bend waveguide is an indispensable part of the integrated optical device. In optical switching arrays, star couplers and arrayed waveguide gratings, and the integration of multiple components onto a single chip, many S-shaped bending waveguides are required to achieve lateral displacement and connection of the waveguide. Its size and loss directly affect the overall device loss and integration density. Bending Waveguide Insertion Loss (Excluding Scattering Losses of Light Due to Structural Defects) consists of two parts, pure bending loss and transition loss. Based on the mechanism of bending loss, an S-shape optimization method based on B-spline functional approximation theory is proposed to obtain the S-shape waveguide with pure bending loss as small as possible and to eliminate the transition losses at the straight waveguide. Compared with the S-shape obtained by the sine, cosine and double arc curves, it is verified by the beam propagation method. The results show that the insertion loss of the optimized curve is obviously less than that of double arc and cosine curve.