1 重庆光电技术研究所，重庆 400060
2 量子信息芯片与器件重庆重点实验室，重庆 400060
3 北京邮电大学信息光子学与光通信国家重点实验室，北京 100876
为实现高速、高灵敏度、低成本的激光通信，优化改进一种新的InGaAs/InP单光子雪崩二极管（SPAD）以更好地使其应用于单个单光子探测器（SPD）探测的近红外激光通信系统。与上一代相比，优化各层结构的同时，在其中加入了介质-金属反射层并改进了双Zn扩散工艺。在1.25 GHz高频正弦门控（SWG）工作模式、225 K温度和6 V偏置下，所制备的InGaAs/InP SPAD实现了光子探测效率（PDE）为30%、暗计数率（DCR）为3 kHz和后脉冲概率（Pap）为2.4%的单光子性能。将基于高性能SPAD制备的自由运行负反馈雪崩二极管（NFAD）作为接收机，应用到已有实时激光通信系统中，实验得到了单个NFAD的激光通信性能参数。结果表明，在使用4进制脉冲相位调制（4PPM）方案中，在1 Mbit/s比特率条件下，单个InGaAs/InP NFAD具有1.1×10-5误码率和-69.6 dBm灵敏度。
InGaAs/InP 单光子探测器 单光子雪崩二极管 负反馈雪崩二极管 光子探测效率 激光通信 激光与光电子学进展
2024, 61(7): 0706014
Author Affiliations
Abstract
1 State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
2 School of Digital Media and Design Arts, Beijing University of Posts and Telecommunications, Beijing 100876, China
Transverse mode characteristics of a laser are related to a variety of interesting applications. An on-demand mode solid laser in the 1064 nm band was proposed previously. In this paper, we provide a fiber laser for on-demand modes in the 1550 nm band to prescribe the pure and high-quality emission of a higher-order transverse laser mode, based on a simple construction with one spatial light modulator (SLM) and a single-mode erbium-doped fiber (SM-EDF). The SLM is designated to generate the desired higher-order mode and separate the higher-order mode and the fundamental mode. The fundamental mode oscillates in the fiber ring laser, and therefore the SM-EDF can be pumped with a single-mode 980 nm laser, no matter what higher-order mode is prescribed. In this proof-of-principle experiment, high-quality higher-order modes are observed from LP01 to LP105. Stable emission and real-time switching between modes can be easily realized by altering the phase on the SLM. In addition, the propagation of the LP01, LP11, LP21, and LP02 modes from the fiber laser is also demonstrated in a four-mode few-mode fiber.
Lasers, erbium Laser beam shaping Phase modulation Spatial light modulators Photonics Research
2017, 5(3): 03000256
Author Affiliations
Abstract
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
In this paper, we present a mode-selective coupler based on a dual-core all-solid photonic bandgap fiber (AS-PBGF). Because they are all-solid, AS-PBGF-based mode converters are easier to splice to other fibers than those based on air-hole photonic crystal fibers. Mode conversions between the LP01 and LP11 modes, LP01 and LP21 modes, and LP01 and LP01 modes are obtained at the wavelength λ _ 1550 nm. The 3 dB wavelength bandwidth of these mode converters are 47.8, 20.3, and 20.3 nm, respectively.
Optical communications Optical communications Photonic crystal fibers Photonic crystal fibers Photonics Research
2015, 3(5): 05000220
