光子学报
2023, 52(12): 1206004
1 中煤科工集团上海有限公司,上海 200030
2 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
提出了一种利用内调制频率调谐实现高空间分辨率的时间门控数字光频域反射仪(TGD-OFDR)方案,采用电流调谐的分布式反馈(DFB)二极管激光器作为探测光源提供较大的激光频率调谐范围的信号,利用马赫-曾德尔干涉仪(MZI)分析该DFB激光器的电流-频率响应特性后,由任意波形发生器产生的带有预失真的锯齿波信号驱动该DFB激光器,进而补偿激光器扫频时的非线性,同时采用一台波长可调节的稳频激光器的出射光充当本地稳频参考光。实验测试在74 km的光纤链路上实现了10 cm的空间分辨率,动态范围为23.3 dB。
传感器 光纤测量 时间门控数字光频域反射仪 分布式反馈激光器 预失真
Author Affiliations
Abstract
1 Key Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu 273165, China
We report the InAs/GaAs quantum dot laterally coupled distributed feedback (LC-DFB) lasers operating at room temperature in the wavelength range of 1.31 µm. First-order chromium Bragg gratings were fabricated alongside the ridge waveguide to obtain the maximum coupling coefficient with the optical field. Stable continuous-wave single-frequency operation has been achieved with output power above 5 mW/facet and side mode suppression ratio exceeding 52 dB. Moreover, a single chip integrating three LC-DFB lasers was tentatively explored. The three LC-DFB lasers on the chip can operate in single mode at room temperature, covering the wavelength span of 35.6 nm.
InAs quantum dot laterally coupled distributed feedback laser Chinese Optics Letters
2023, 21(1): 011402
Author Affiliations
Abstract
1 Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Institute of Optical Communication Engineering, and Nanjing University-Tongding Joint Laboratory for Large-Scale Photonic Integrated Circuits, Nanjing University, Nanjing 210023, China
2 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
3 School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
A wideband wavelength-tunable distributed feedback (DFB) semiconductor laser array based on the reconstruction-equivalent-chirp (REC) technique using a simple tuning scheme is demonstrated. It consists of 20 DFB lasers with matrix interleaving distributions, two-level cascaded Y-branch optical combiners, and one active semiconductor optical amplifier (SOA), all in-series integrated on one chip. Unlike the traditional thermal-electric cooler (TEC)-based wavelength-tuning scheme, the tunable REC-DFB laser array achieves a faster and broader continuous wavelength-tuning range using TaN thin-film heaters integrated on the AlN submount. By changing the injection current of the TaN resistor from 0 to 190 mA, the proposed tunable laser achieves a wavelength-tuning range of per channel and a total tuning of over 50 nm. This study opens up new avenues for realizing cost-effective and wide-tuning-range semiconductor lasers.
distributed feedback laser array reconstruction-equivalent-chirp technique tunable laser thin-film heater integrated on the submount wide tuning range Chinese Optics Letters
2023, 21(1): 011406
1 山东大学 激光与红外系统集成技术教育部重点实验室, 山东 青岛 266237
2 厦门市三安集成电路有限公司, 福建 厦门 361000
高速波分复用分布式反馈(DFB)激光器是数据通信的核心器件, 其可靠性影响了整个通信系统的可靠性。对自主研发的25 Gb/s 4波长粗波分复用(CWDM4) DFB激光器进行了2种老化筛选(Burn-in)实验和失效分析, 并采用三温法推算了激光器的工作寿命。实验结果表明: 对激光器采用光加速(25 ℃、100 mA)和温度加速(100 ℃、75 mA)相结合的Burn-in方法能够有效激发薄弱激光器的早期失效特征; 采用三温法推算激光器在60 ℃、45 mA环境下长期工作的实际寿命至少为17年。
分布式反馈激光器 可靠性 老化筛选 激活能 寿命 distributed feedback laser, reliability, burn-in,
1 绵阳职业技术学院 电子与信息学院,四川 绵阳 621000
2 中国工程物理研究院 流体物理研究所, 四川 绵阳 621900
温度对分布式反馈(DFB)激光器的性能指标和工作寿命有着重要影响。针对宽温度范围下的激光器应用,分析了激光器温控系统的研究现状及趋势,给出了温控系统的设计原理,采用线性驱动与PID闭环控制方法,应用模拟器件,研制了一种DFB激光器的模拟控温检测系统,并利用该系统对1550 nm的DFB激光器进行了试验验证。结果表明,系统在−55 ℃~70 ℃的全温度范围下,保持长时间工作(≥2 h),激光器的工作状态稳定,中心波长未出现漂移。系统的温度控制精度随着工作环境温度的范围不同而有所差异,在室温环境下可达到±0.02 ℃,在全温范围内控制精度在±0.8 ℃以内,跟踪误差小于±0.5 dB。与传统的激光器温控系统相比,本系统工作温度范围宽、控制精度高,且体积小、成本低、简单可靠,对于温度环境要求较为严苛的DFB激光器应用场景,具有重要的工程实践意义。
TEC驱动 PID补偿 分布式反馈激光器 运算功率放大器 TEC driver PID compensation distributed feedback laser operational power amplifier 强激光与粒子束
2021, 33(11): 111014
上海交通大学 电子信息与电气工程学院,上海 200240
由于目标运动时对后期处理式的相位噪声补偿方法有影响,回波拍频信号相位噪声与辅助干涉仪获取的相位噪声不匹配,导致引入额外残余相位噪声。针对该问题,分析了调频连续波(FMCW)激光雷达系统中目标物体运动对于传统光源相位噪声补偿法的影响,提出了一种预估目标距离及速度进行光源相位噪声补偿的新方法。系统光源部分采用分布反馈(DFB)激光器,使用电流直接调制进行线性扫频。对运动物体进行实测的结果表明:采用新型光源相位噪声补偿方法,测量精准度提升了41倍,且能同时精确测量距离与速度。
调频连续波 激光雷达 预失真 相位噪声补偿 分布反馈激光器 frequency modulated continuous wave lidar pre-distortion phase-noise-compensation distributed feedback laser