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
针对传统光纤传感难以实现应变矢量感知的问题，设计并实验验证了基于同相正交（IQ）调制的光频域反射仪（OFDR）的多芯光纤应变矢量传感系统。使用IQ调制技术，实现了光源线性扫频，利用多芯光纤空间结构关系，在OFDR系统中获得了七芯光纤弯曲后的应变矢量信息。实验结果表明，当光源扫频范围990 MHz时，在87 m七芯光纤中，弯曲应变空间分辨率为28.35 cm。当光纤弯曲曲率为1.78 m-1时，角度分辨率为29°。同时进一步通过仿真分析表明，当扫频范围提高到10 GHz时，理论上可以达到1.02°的角度分辨率，从而进一步提高系统性能。
光纤传感 光频域反射仪 应变矢量 七芯光纤 同相正交调制 激光与光电子学进展
2023, 60(23): 2306005
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
We demonstrate a blind zone-suppressed and flash-emitting solid-state Lidar based on lens-assisted beam-steering technology. As a proof-of-concept demonstration, with the design of a subwavelength-gap 1D long-emitter array and multiwavelength flash beam emitting, the device was measured to have 5% blind zone suppression, 0.06°/point-deflection step, and 4.2 μs scanning speed. In time-of-flight ranging experiments, Lidar systems have a field of view of (normal device) or (blind-zone suppressed device), far-field number of resolved points of 192, and a detection distance of 10 m. This work demonstrates the possibility that a new integrated beam-steering technology can be implemented in a Lidar without sacrificing other performance.
Photonics Research
2021, 9(9): 09001871
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Intelligent Microwave Lightwave Integration Innovation Center (iMLic), Shanghai Institute for Advanced Communication and Data Science, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
We demonstrate a novel multifunctional radar receiver scheme based on photonic parametric sampling. The working principle of photonic parametric sampling based on four-wave mixing (FWM) process is presented. To experimentally verify the multifunctional feasibility, the scheme is individually implemented to carry out a four-channel phased array radar reception and a dual-band radar reception.
microwave photonics radar receiver photonic parametric sampling four-wave mixing Chinese Optics Letters
2020, 18(4): 042501
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
This Letter theoretically and experimentally studies the response of photonic switching in a channel-interleaved photonic analog-to-digital converter (PADC) with high sampling rate and wide input frequency range. A figure of merit (FoM) is introduced to evaluate the switching response of the PADC when a dual-output Mach–Zehnder modulator (MZM) serves as the photonic switch to parallelize the sampled pulse train into two channels. After the optimization of the FoM and utilization of the channel-mismatch compensation algorithm, the system bandwidth of PADC is expanded and the signal-to-distortion ratio is enhanced.
060.5625 Radio frequency photonics 230.0250 Optoelectronics 250.4745 Optical processing devices Chinese Optics Letters
2018, 16(12): 120602
Author Affiliations
Abstract
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2 Transmission Technology Research Department, Huawei Technology Co. Ltd., Shenzhen 518129, China
We present an equivalent circuit model for a silicon carrier-depletion single-drive push–pull Mach–Zehnder modulator (MZM) with its traveling wave electrode made of coplanar strip lines. In particular, the partialcapacitance technique and conformal mapping are used to derive the capacitance associated with each layer. The PN junction is accurately modeled with the fringe capacitances taken into consideration. The circuit model is validated by comparing the calculations with the simulation results. Using this model, we analyze the effect of several key parameters on the modulator performance to optimize the design. Experimental results of MZMs confirm the theoretical analysis. A 56 Gb/s on–off keying modulation and a 40 Gb/s binary phase-shift keying modulation are achieved using the optimized modulator.
Optoelectronics Optoelectronics Electro-optical devices Electro-optical devices Modulators Modulators Integrated optoelectronic circuits Integrated optoelectronic circuits Photonics Research
2016, 4(4): 04000153
1 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
2 上海交通大学, 上海市北斗导航与位置服务重点实验室, 上海 200240
3 浙江师范大学数理信息与工程学院, 浙江 金华 321004
提出了一种基于光纤的时间和频率同时传递方案。采用基于温控光纤延迟线和压电陶瓷(PZT)光纤延迟线的光学相位噪声补偿技术实现高稳定的频率传递。同时，通过波分复用技术在稳定的光纤链路上进行基于时分复用的高精度同纤同波双向时间传递。在100 km 的光纤链路上进行了时间和频率同时传递实验，光纤频率传递链路的秒稳定度和天稳定度分别达到5.25 × 10-14 和1.9 × 10-17 ；双向时间比对在1 s 处的时间传递秒稳定度优于40ps，在平均时间1000 s处优于1.5 ps。时间差抖动的峰-峰值和标准差分别小于400 ps和45 ps。
光纤光学 光纤频率传递 光纤时间传递 相位补偿 频率稳定性 时延抖动精度
1 宁夏大学物理电气信息学院，宁夏沙漠信息智能感知重点实验室, 宁夏 银川 750021
2 兰州大学西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000
3 上海交通大学密西根学院, 上海 200240
4 上海交通大学电子信息与电气工程学院, 上海 200240
基于极化面电荷密度和瑞利散射理论，通过数值计算与仿真讨论了风沙静电场对沙粒光学性质的影响。数值结果表明：在考虑风沙静电场作用的情况下，沙粒对电磁波的散射效率随着电荷分布角的增加先增加后减小，而其对电磁波的吸收效率保持恒定，但其值远大于不考虑环境电场作用时的对应值。另外，随着沙尘浓度及其含水量的增加，沙尘暴对电磁波的衰减率增强。结果说明在沙尘暴遥感的研究中必须考虑到沙尘暴中的静电场作用。
大气光学 风沙静电场 瑞利散射 表面电荷 局部带电
Author Affiliations
Abstract
A modal interferometer is experimentally demonstrated based on tapering a single-mode-multimode-single-mode (SMS) fiber structure heated by hydrogen flame. The interference fringe begins to form when tapering length is 19.8 mm, and becomes regular and clear when the tapering length is longer and the tapered waist diameter is smaller. Annealing process is undertaken to achieve a high extension ratio of approximately 17 dB with free spectral range of 1.5 nm when the tapering length is 33 mm and the tapered waist diameter is approximately 5 \mu m. The temperature and axial strain dependences of the tapered SMS structure are characterized, and the measured temperature and strain coefficients are +7 pm/oC and –9.536 pm/\mu \varepsilon, respectively.
060.2340 Fiber optics components 130.3990 Micro-optical devices 230.4000 Microstructure fabrication Chinese Optics Letters
2012, 10(7): 070609
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Frontiers of Optoelectronics
2011, 4(4): 359
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
A novel, compact, and highly efficient fiber-to-chip evanescent coupling structure is proposed based on a subwavelength-diameter fiber. The coupling structure is characterized by a large misalignment tolerance and easy fabrication. The dependence of coupling efficiency on various parameters is calculated and analyzed. The simulation results show that a coupling efficiency as high as 95% can be obtained within a coupling length of <4 \mum.
微纳光纤 硅基波导 倏逝场耦合 060.2340 Fiber optics components 130.3120 Integrated optics devices Chinese Optics Letters
2011, 9(5): 050604
