新型直波导阵列波导光栅的设计与仿真

Design and simulation of novel arrayed-waveguides grating

提出了一种基于直波导的新型阵列波导光栅(AWG)。与常规阵列波导光栅器件相比,该方法简化了器件结构与制备工艺,有望提高器件成品率,降低器件制作成本。器件的输入/输出耦合器采用自聚焦平板波导(GISLAB),其输入/输出均为平端面。阵列波导采用直波导取代常规 AWG 的弯曲波导,可采用光敏平板波导材料通过两次紫外写入实现。采用半矢量光束传输法对器件进行模拟,结果表明该器件可以实现多波长的解复用,其解复用的信道间隔为3.2 nm,输出光谱非均匀性约为1.6 dB。

A novel arrayed-waveguides grating (AWG) based on unbent waveguide is proposed.Compared with a conventional AWG,the method simplifies the device structures and its fabrication technique is much easier,hence its fabrication cost is much lower and a higher rate of finished products could be gotten.Two graded index planar waveguides (GISLAB) are used as input and output planar waveguide respectively,hence the input/output ports are flat-faced.The arrayed waveguides are replaced by unbent waveguides that are photosensitive planar waveguides directly written by UV light twice.The FD—SVBPM is used to simulate wave propagation in our device and the simulation result shows that the novel AWG can be a wavelength demultiplexer,its channel space is 3.2 nm and the nonuniformity of its output spectral response is 1.6 dB.