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

S-shaped bend waveguide is indispensable to realize the lateral displacement and connections in the integrated optical devices, such as the optical switch matrix, star coupler and arrayed waveguide grating (AWG). Even when various optical devices are integrated onto one chip, S-bend also plays important roles. Its size and optical loss directly influences the integration dense and loss of whole device. The insertion loss (except the dispersion loss produced by the configuration defection) of S-bend includes two parts