Author Affiliations
Abstract
1 Research Center for Humanoid Sensing, Zhejiang Lab, Hangzhou 311121, China
2 ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 310014, China
3 State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310058, China
Miniaturized fiber-Bragg-grating (FBG) interrogators are of interest for applications in the areas where weight and size controlling is important, e.g., airplanes and aerospace or in-situ monitoring. An ultra-compact high-precision on-chip interrogator is proposed based on a tailored arrayed waveguide grating (AWG) on a silicon-on-insulator (SOI) platform. The on-chip interrogator enables continuous wavelength interrogation from 1 544 nm to 1 568 nm with the wavelength accuracy of less than 1 pm [the root-mean-square error (RMSE) is 0.73 pm] over the whole wavelength range. The chip loss is less than 5 dB. The 1 × 16 AWG is optimized to achieve a large bandwidth and a low noise level at each channel, and the FBG reflection peaks can be detected by multiple output channels of the AWG. The fabricated AWG is utilized to interrogate FBG sensors through the center of gravity (CoG) algorithm. The validation of an on-chip FBG interrogator that works with sub-picometer wavelength accuracy in a broad wavelength range shows large potential for applications in miniaturized fiber optic sensing systems.
Fiber optic sensing on-chip interrogator arrayed waveguide grating center of gravity Photonic Sensors
2024, 14(1): 240126
Author Affiliations
Abstract
1 College of Science, Kunming University of Science and Technology, Kunming 650093, China
2 College of Electronic Science and Engineering, Jilin University, Jilin 130012, China
The silicon-based arrayed waveguide grating (AWG) is widely used due to its compact footprint and its compatibility with the mature CMOS process. However, except for AWGs with ridged waveguides of a few micrometers of cross section, any small process error will cause a large phase deviation in other AWGs, resulting in an increasing cross talk. In this paper, an ultralow cross talk AWG via a tunable microring resonator (MRR) filter is demonstrated on the SOI platform. The measured insertion loss and minimum adjacent cross talk of the designed AWG are approximately 3.2 and -45.1 dB, respectively. Compared with conventional AWG, its cross talk is greatly reduced.
SOI platform arrayed waveguide grating cross talk microring filter array thermo-optic effect Chinese Optics Letters
2024, 22(3): 031303
光子学报
2023, 52(10): 1052417
Author Affiliations
Abstract
1 Zhejiang University, College of Optical Science and Engineering, International Research Center for Advanced Photonics, State Key Laboratory for Extreme Photonics and Instrumentation, Hangzhou, China
2 Jiaxing Key Laboratory of Photonic Sensing and Intelligent Imaging, Jiaxing, China
3 Zhejiang University, Jiaxing Research Institute, Intelligent Optics and Photonics Research Center, Jiaxing, China
4 Zhejiang University, Ningbo Research Institute, Ningbo, China
A silicon-based digitally tunable positive/negative dispersion controller (DC) is proposed and realized for the first time using the cascaded bidirectional chirped multimode waveguide gratings (CMWGs), achieving positive and negative dispersion by switching the light propagation direction. A 1 × 2 Mach–Zehnder switch (MZS) and a 2 × 1 MZS are placed before and after to route the light path for realizing positive/negative switching. The device has Q stages of identical bidirectional CMWGs with a binary sequence. Thus the digital tuning is convenient and scalable, and the total dispersion accumulated by all the stages can be tuned digitally from - ( 2Q - 1 ) D0 to ( 2Q - 1 ) D0 with a step of D0 by controlling the switching states of all 2 × 2 MZSs, where D0 is the dispersion provided by a single bidirectional CMWG unit. Finally, a digitally tunable positive/negative DC with Q = 4 is designed and fabricated. These CMWGs are designed with a 4-mm-long grating section, enabling the dispersion D0 of about 4.16 ps / nm in a 20-nm-wide bandwidth. The dispersion is tuned from -61.53 to 63.77 ps / nm by switching all MZSs appropriately, and the corresponding group delay is varied from -1021 to 1037 ps.
silicon photonics dispersion tuning digital tuning multimode waveguide grating Advanced Photonics
2023, 5(6): 066005
1 西安电子科技大学物理学院,陕西 西安 710071
2 上海理工大学上海市现代光学系统重点实验室,上海 200093
3 苏州大学江苏省先进光学制造技术重点实验室,江苏 苏州 215006
4 中国电子科技集团公司第二十七研究所,河南 郑州 450047
基于绝缘体上硅材料平台,设计并制作了一种结构紧凑的高均匀性硅波导阵列波导光栅,其拥有8个输出通道并且通道间隔为200 GHz。分析了绝缘体上硅材料平台中硅波导的弯曲半径对弯曲损耗和有效折射率的影响。测试结果表明,该器件的插入损耗为19.6 dB,串扰为-15 dB,非均匀性为0.87 dB,3 dB带宽为1.06 nm,结构尺寸仅为294 μm×190 μm。芯片的制作工艺与互补金属氧化物半导体工艺兼容,这使得阵列波导光栅的大批量、低成本生产成为可能,对集成波分复用网络的发展具有重要的意义。
集成光学 阵列波导光栅 结构紧凑 硅基波导 波分复用 中国激光
2023, 50(22): 2219001
杭州电子科技大学通信工程学院,浙江 杭州 310016
在基于阵列波导光栅(AWG)的光互连数据中心中,提出了一种改进的多信道矩阵接收方案,该方案允许每个节点同时接收任意一组波长。该方案基于差错控制编码理论设计了只需要使用少量接收机、固定波长滤波器和一个波长可变滤波器的组合。通过OptiSystem软件仿真验证了在10 Gbit/s和40 Gbit/s的传输速率下,新旧接收方案的接收差异。实验表明,该方案可以有效降低发射功率和减少接收端所需固定波长滤波器的数量,节约了数据中心的设备成本和功耗。
光通信 光互连数据中心 阵列波导光栅 矩阵接收 光学学报
2023, 43(13): 1306006
上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海 200240
提出一种将质子交换技术和刻蚀技术结合的体铌酸锂波导和器件加工方案,基于质子交换的铌酸锂晶体相变特性改变,降低了质子交换区直接刻蚀难度,结合质子交换的纵向折射率改变和刻蚀波导的横向结构改变,波导尺寸显著降低,采用粒子群算法优化波导尺寸,最小可达2.5m。基于该工艺方案设计了中心波长为1550 nm、四通道且通道间隔为400 GHz的阵列波导光栅,该阵列波导光栅的传输损耗约为6 dB,相邻通道间串扰均低于22 dB,整体尺寸仅为850 ×620 μm,在高密度铌酸锂光子集成互连等场景具有较大的应用潜力。
光栅 铌酸锂 质子交换 粗波分复用 阵列波导光栅 光学学报
2023, 43(13): 1305003
1 天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室,天津 300072
2 天津大学四川创新研究院,四川 成都 610200
光栅波导显示系统在生产加工和装调过程中,由于微纳加工设备的系统误差、累计误差和人为装调误差会影响系统成像质量产生重像、模糊等问题。为了解决上述问题,设计了一种一维扩瞳光栅波导并采用光线追迹仿真方法,分析了光栅波导平行度误差、光栅周期误差、系统装调误差对成像质量的影响。实验加工并装调测试了光栅波导的成像质量,通过控制波导平整度在0.3′以内,光栅周期公差在0.2 nm以内,制造了一维出瞳扩展光栅波导,准直装调后达到了30×12°视场角,实现了良好的增强现实显示效果和清晰的成像质量,对实际的量产制造具有指导意义。
光栅 增强现实显示 波导光栅 杂散光 误差分析 激光与光电子学进展
2023, 60(9): 0905003
Author Affiliations
Abstract
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Long-period waveguide grating based filters have attracted attention due to their flexible fabrication, a variety of materials and structures, low back reflection, low insertion loss, and excellent performance in the tuning range and temperature sensitivity. To our knowledge, for the first time, a two-segment polymer long-period waveguide grating was cascaded to implement a filter with a narrower bandwidth. Experimental results showed that the device had a maximum extinction ratio of 24 dB at 1 577 nm, and the 12 dB bandwidth was 10 nm. The temperature sensitivity of the fabricated device was 1.79 nm/℃.
Long-period waveguide grating optical waveguide mode coupling filter Photonic Sensors
2022, 12(4): 220415
光子学报
2022, 51(11): 1113003