Silicon waveguides typically exhibit optical anisotropy, which leads to polarization correlation and single-polarization operations. This consequently creates a demand for polarization-control devices. This paper introduces a CMOS-compatible O-band reconfigurable TE/TM polarization rotator comprising two symmetrical polarization rotator–splitters and phase shifters. This configuration enables dynamic conversion of any linear polarization to its quadratic equivalent. Experimental results indicate that the reconfigurable polarization rotator exhibits an insertion loss of less than 1.5 dB. Furthermore, the bandwidth for a polarization extinction ratio beyond 15 dB exceeds 60 nm.

提出了一种三信道石墨烯电光调制和模分复用集成器件，该器件由单层石墨烯覆盖的一维光子晶体纳米梁腔电光调制模块和纳米线波导模分复用模块组成。利用三维时域有限差分法进行仿真分析，结果表明，该器件可以同时实现TE₀模、TE₁模和TE₂模的调制和模分复用功能。当波长为1 570 nm时，消光比大于28.3 dB，插入损耗小于0.21 dB，信道串扰小于-28.6 dB，调制器的3 dB带宽达到100 GHz，器件尺寸约为100 μm×13 μm。该集成器件性能优良，在大容量光通信系统中具有重要的应用价值。

Conventional electronic processors, which are the mainstream and almost invincible hardware for computation, are approaching their limits in both computational power and energy efficiency, especially in large-scale matrix computation. By combining electronic, photonic, and optoelectronic devices and circuits together, silicon-based optoelectronic matrix computation has been demonstrating great capabilities and feasibilities. Matrix computation is one of the few general-purpose computations that have the potential to exceed the computation performance of digital logic circuits in energy efficiency, computational power, and latency. Moreover, electronic processors also suffer from the tremendous energy consumption of the digital transceiver circuits during high-capacity data interconnections. We review the recent progress in photonic matrix computation, including matrix-vector multiplication, convolution, and multiply–accumulate operations in artificial neural networks, quantum information processing, combinatorial optimization, and compressed sensing, with particular attention paid to energy consumption. We also summarize the advantages of silicon-based optoelectronic matrix computation in data interconnections and photonic-electronic integration over conventional optical computing processors. Looking toward the future of silicon-based optoelectronic matrix computations, we believe that silicon-based optoelectronics is a promising and comprehensive platform for disruptively improving general-purpose matrix computation performance in the post-Moore’s law era.

硅材料在1.1~8.5 μm有非常低的吸收损耗，因此硅基光电子学有望扩展到中红外波段。并且随着通信窗口扩展、气体分子检测、红外成像等应用需求的出现，硅基中红外波段器件研发工作的开展势在必行。在中红外波段硅基光电子器件中，硅基调制器有着举足轻重的地位：它是长波光通信链路中不可或缺的一环，还可以应用在片上传感系统中提高信噪比、实现光开关等功能。研究发现，相比于近红外波段，硅和锗材料在中红外波段有更强的自由载流子效应和热光效应，因此，基于硅基材料的中红外调制器具有独天得厚的优势。系统总结了中红外硅基调制器的发展趋势和研究现状，介绍了基于硅和锗材料的电光调制器以及热光调制器的工作原理和最新研究进展，最后对中红外硅基调制器进行了总结与展望。

为了解决传统电光混合运算逻辑单元速率低、功耗高、尺寸大等问题，以实现电光混合高速运算，本文设计了一种基于介电常数近零态（Epsilon-Near-Zero）和铟锡氧化物（ITO）薄膜电调控的集成硅基波导电光混合半加器。利用ITO激活材料薄膜的电调控特性实现了光路通断和交叉，从而实现了两位二进制数的半加法功能，通过3D-FDTD模拟仿真对器件模型结构参数进行了优化设计。仿真实验结果表明，当施加电压为0 V和2.35 V时，器件能够完成光信号逻辑控制。电光混合半加器工作在1550 nm波长时，其插入损耗为0.63 dB，消光比为31.73 dB，数据传输速率为61.62 GHz，每字节消耗能量为13.44 fJ，整个半加器尺寸小于21.3 μm×1.5 μm×1.2 μm。该器件具有结构紧凑、插入损耗低等特点，为高速电光混合光学逻辑器件及半加器设计提供了理论依据。