论文部分内容阅读
根据多模干涉器(MMI,multimode interferometer)的自映像效应,设计了基于2×4MMI的聚合物相干光混频器,优化光混频器结构参数;采用模式转换设计解决多模波导的自映像与单模波导模式失配的问题,从而进一步提高其性能。仿真结果表明,优化后的光混频器其传输损耗小于6.3dB,传输不均衡性小于1dB,相位误差小于1°,并且MMI长度与宽度的设计容差分别达到40μm和0.5μm。根据设计制备了聚合物光混频器,通过实验表征了此光混频器的传输性能。在C波段下的测量结果表明,其传输损耗小于10dB,不均衡性在0.5~1.5dB之间,相位误差小于10°,而达到这些性能的MMI长度与宽度的器件容差分别为25μm和0.5μm,均大于制备过程中0.1μm的工艺容差。测量结果与理论模拟结果基本吻合。本文的聚合物光混频器成本低、容差高,对实现高集成度相干接收机具有实际意义。
According to the self-imaging effect of multimode interferometer (MMI), a 2 × 4MMI-based polymer coherent optical mixer is designed to optimize the structure parameters of the optical mixer. The mode conversion design is used to solve the self- And single-mode waveguide mode mismatch problems, thereby further improving its performance. The simulation results show that the optimized optical mixer has transmission loss less than 6.3dB, transmission imbalance less than 1dB and phase error less than 1 °, and the design tolerances of MMI length and width are respectively 40μm and 0.5μm. According to the design and preparation of a polymer light mixer, the performance of the light mixer is characterized experimentally. Measurement results in the C band indicate that the transmission loss is less than 10 dB, the imbalance is between 0.5 and 1.5 dB and the phase error is less than 10 °, whereas the device tolerances for MMI length and width to achieve these properties are 25 μm and 0.5, respectively μm, both greater than the manufacturing process of 0.1μm process tolerance. The measured results are in good agreement with the theoretical simulation results. The polymer optical mixer in this paper has the advantages of low cost and high tolerance, which has practical significance for realizing highly integrated coherent receiver.