Polarization control of light waves is an important technique in optical communication and signal processing. On-chip polarization rotation from the fundamental transverse-electric (TE00) mode to the fundamental transverse-magnetic (TM00) mode is usually difficult because of their large effective refractive index difference. Here, we demonstrate an on-chip wideband polarization rotator designed with a genetic algorithm to convert the TE00 mode into the TM00 mode within a footprint of 0.96 mu m x 4.2 mu m. In simulation, the optimized structure achieves polarization rotation with a minimum conversion loss of 0.7 dB and the 1-dB bandwidth of 157 nm. Experimentally, our fabricated devices have demonstrated the expected polarization rotation with a conversion loss of similar to 2.5 dB in the measured wavelength range of 1440-1580 nm, where the smallest value reaches similar to 2 dB. The devices can serve as a generic approach and standard module for controlling light polarization in integrated photonic circuitry. (C) 2017 Optical Society of America
展开▼
机译：光波的极化控制是光通信和信号处理中的重要技术。从基本横向电气（TE00）模式到基本横向磁性（TM00）模式的片上偏振旋转通常是难以困难的，因为它们的有效折射率差异很大。在这里，我们展示了一种片上宽带偏振旋转器，设计了具有遗传算法的遗传算法，将TE00模式转换为0.96 mu m x 4.2 mu m的占地面积内的TM00模式。在仿真中，优化结构实现了偏振旋转，最小转换损耗为0.7dB，1-dB带宽为157nm。通过实验，我们的制造设备已经证明了预期的偏振旋转，其转换损耗在测得的波长范围内与2.5 dB相似，在1440-1580nm的测量波长范围内，其中最小值达到2 dB。该设备可以用作用于控制集成光子电路中的光极化的通用方法和标准模块。 （c）2017年光学学会
展开▼
