Author Affiliations
Abstract
1 Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
A monolithic integrated few-mode transmitter comprising of two directly modulated distributed feedback lasers and a multimode-interference-coupler-based mode converter-multiplexer with 66% mode conversion efficiency was designed and demonstrated. A fundamental TE0 mode and a first-order TE1 mode were successfully generated from the transmitter, with the output power of 4 and 5.5 mW at a pump current of around 150 mA, respectively, at the common output port. The small signal modulation bandwidth of the TE0 and TE1 channels reached 17.4 and 14.7 GHz, respectively. Error-free 2×10-Gbit/s direct modulation of the two-mode transmitter was demonstrated, with a power penalty of 4.3 dB between the TE0 mode and the TE1 mode at the bit error rate of 1×10 9.
Multiplexing Optical interconnects Photonic integrated circuits Semiconductor lasers Photonics Research
2018, 6(5): 05000463
1 中国科学院 半导体研究所 集成光电子学国家重点实验室, 北京 100083
2 中国科学院大学, 北京 100049
为了对石油气挥发性有机化合物的主要成分进行实时监测, 实现石油化工行业的安全生产, 采用激光光谱分析技术、利用宽谱光源分析了丙烷在1686.00nm~1687.00nm波段的光谱吸收特征, 获得了吸收系数随波长变化的洛伦兹线型, 其半峰半宽为0.21nm。选择中心波长为1686.30nm的分布反馈式半导体激光器作为光源, 在丙烷宽谱吸收峰范围内进行波长扫描, 得到了一次谐波信号和二次谐波信号随丙烷体积分数的变化规律, 并在丙烷的体积分数0.0050~0.0300范围内标定了二次谐波与一次谐波信号的比值与体积分数的线性关系。结果表明, 实验系统有很好的稳定性与重复性, 能够进行实时的丙烷在线检测。该研究为探测其它挥发性有机化合物气体提供了理论及实验参考。
光谱学 丙烷探测 可调谐半导体激光 近红外 挥发性有机化合物 spectroscopy propane detection tunable diode laser near infrared volatile organic compound
1 中国科学院半导体研究所半导体材料科学重点实验室, 低维半导体材料与器件北京市重点实验室, 北京 100083
2 北京大学物理学院人工微结构和介观物理国家重点实验室, 北京 100871
3 格拉斯哥大学物理学院, 格拉斯哥G12 8LT, 英国
采用两段式被动锁模激光器结构, 利用隧道结级联两组量子阱有源区, 实现了一种工作在近红外波段的单片集成大功率量子阱被动锁模激光器。对该锁模激光器的锁模特性进行了表征, 测试得到该锁锁模激光器工作中心波长为1038 nm, 激光脉冲重复频率为24.37 GHz, 改变激光器的工作条件, 其脉冲宽度变化范围为2.19~9.27 ps, 峰值功率变化范围为76~308 mW, 表明该锁模激光器具有单片集成、体积小、功率大、重复频率高等优良特性。同时, 在一定的反向偏压条件下, 该锁模激光器呈现出功率双稳态的特性, 扩大了有效锁模范围。
激光器 锁模激光器 半导体激光器 多量子阱 超快激光
Author Affiliations
Abstract
1 Key Laboratory of Semiconductor Materials Science and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2 Network Technology Research Institute, China United Network Communications Corporation Limited, Beijing 100048, China
An InP-based monolithically integrated few-mode transmitter aiming at the combination of wavelength division multiplexing (WDM) and mode division multiplexing (MDM) technologies is proposed. The core elements of the proposed transmitter are mode converters and a wavelength-mode division multiplexer that are all based on multimode interference (MMI) couplers. Simulations show that the wavelength-mode division multiplexer has a large fabrication tolerance of 30 and 0.5 μm for the length and the width of the device, respectively. A low loss below 0.26 dB for the passive parts of the transmitter is obtained in the whole C-band wavelength range.
250.5300 Photonic integrated circuits 060.4230 Multiplexing 060.4510 Optical communications Chinese Optics Letters
2016, 14(8): 080601
1 中国科学院半导体研究所材料重点实验室, 北京 100086
2 中国科学院福建物质结构研究所, 福建 350002
采用多量子阱掩埋条形(BRS)增益芯片和拉锥光纤布拉格光栅(FBG)，制作了1.5 μm 波段FBG 外腔式窄线宽半导体激光器。封装后器件实现了全电流范围内稳定单模窄线宽激光输出。30~250 mA 驱动电流下线宽小于15.48 kHz，实测最小线宽为6.42 kHz，频率稳定度为7.2×10-8/s，边模抑制比大于40 dB，最大出纤功率大于10 mW。这种集成窄线宽激光器性能优异，且制作成本低，工艺简单，适于批量生产，可应用于400 Gb/s相干通信系统的发射源与接收机本振源。
激光器 半导体激光器 相干通信 集成光学器件 光纤布拉格光栅
