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
对碲镉汞液相外延(Liquid phase epitaxy, LPE)石墨舟进行了数值模拟，计算了石墨舟温度场分布。通过在母液周围加入石英框，分析其对温度场的影响，得到了石英框壁厚与温度分布的关系。模拟发现，在母液周围加入石英框结构，可以提高外延生长界面温度场均匀性。最后，将分析结果与实验相结合，进行实验验证，成功降低了边界效应对碲镉汞薄膜的影响，外延生长出厚度极差 ..为1.4 .m、组分极差 .x不超过 0.002的长波碲镉汞薄膜。
石墨舟 温度场均匀性 碲镉汞 graphite slider boat temperature uniformity cadmium mercury tellurium LPE LPE
探索了一种准确测量过冷度的实验方法, 并在此基础上, 利用光学显微镜、傅里叶红外透射光谱仪、台阶仪、白光干涉仪等测试手段分析了过冷度对HgCdTe薄膜厚度均匀性的影响.研究结果表明, 过冷度小于2 ℃, 薄膜容易出现中心凹陷、四周凸起的现象; 过冷度大于3 ℃, 薄膜中心将会明显凸起, 出现宽度为毫米级的周期性起伏, 并伴随有crosshatch线产生.当过冷度为2.5 ℃时, 薄膜厚度极差可缩小至0.5 μm, 0.5 mm×0.5 mm范围内薄膜相对于衬底的粗糙度增加量为9.07 nm.
碲镉汞 过冷度 厚度均匀性 液相外延 cadmium mercury tellurium supercooling thickness uniformity liquid phase epitaxy (LPE) 红外与毫米波学报
2019, 38(2): 02165
Author Affiliations
Abstract
1 National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing 210093, China
2 State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
We review the recent work of distributed-feedback (DFB) multi-wavelength semiconductor laser arrays (MWLAs) based on the reconstruction equivalent chirp (REC) technique. The experimental results show that the proposed MWLA has very high wavelength precision (<±0.1 nm), while the fabrication cost is low. Only one step of holographic exposure and another step of photolithography are required for grating fabrication. The packaging technique for a high-bandwidth analog DFB laser and laser array was developed. A directly modulated MWLA transmitter module was achieved. In addition, an improved MWLA with an integrated reflector was proposed and successfully applied in a radio-over-fiber system.
140.2010 Diode laser arrays 050.2770 Gratings Chinese Optics Letters
2017, 15(1): 010005
1 江南大学 物联网工程学院, 江苏 无锡 214132
2 南京大学 现代工程与应用科学学院, 江苏 南京 210093
近年来, 单片集成的多波长激光器阵列作为波分复用(WDM)系统的理想光源而成为研究热点。通过重构-等效啁啾(REC)技术实现了一种低成本的分布反馈式(DFB)激光器阵列光源模块, 采用掺铒光纤放大器(EDFA)对该激光器阵列的输出进行了光学放大, 并通过PID控制程序对光源输出进行稳定化调节。光源模块中各通道激光器的中心波长间隔均匀, 平均间隔为1.64 nm, 波长间隔的误差小于0.2 nm。光源所输出的总光功率大于50 mW, 输出光功率变化小于0.02 dBm。
DFB激光器 波分复用 激光器阵列 重构-等效啁啾 DFB lasers WDM laser array reconstruction-equivalent-chirp 红外与激光工程
2016, 45(11): 1105004
