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国家重点基础研究发展计划(2012CB315701)

作品数:12 被引量:19H指数:2
相关作者:刘永刘爽张尚剑张雅丽杨帆更多>>
相关机构:电子科技大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划教育部“新世纪优秀人才支持计划”更多>>
相关领域:电子电信理学机械工程自动化与计算机技术更多>>

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12 条 记 录,以下是 1-10
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Few-layer MoS2 grown by chemical vapor deposition as a passive Q-switcher for tunable erbium-doped fiber lasers被引量:2
2015年
We report an erbium-doped fiber laser passively Q-switched by a few-layer molybdenum disulfide(MoS2) saturable absorber(SA).The few-layer MoS2 is grown by the chemical vapor deposition method and transferred onto the end-face of a fiber connector to form a fiber-compatible MoS2 SA.The laser cavity is constructed by using a three-port optical circulator and a fiber Bragg grating(FBG) as the two end-mirrors.Stable Q-switched pulses are obtained with a pulse duration of 1.92 μs at 1560.5 nm.By increasing the pump power from 42 to 204 mW,the pulse repetition rate can be widely changed from 28.6 to 114.8 kHz.Passive Q-switching operations with discrete lasing wavelengths ranging from 1529.8 to 1570.1 nm are also investigated by using FBGs with different central wavelengths.This work demonstrates that few-layer MoS2 can serve as a promising SA for wideband-tunable Q-switching laser operation.
Handing XiaHeping LiChangyong LanChun LiJinbo DuShangjian ZhangYong Liu
Passive harmonic mode-locking of Er-doped fiber laser using CVD-grown few-layer MoS_2 as a saturable absorber
2015年
Passive harmonic mode locking of an erbium-doped fiber laser based on few-layer molybdenum disulfide(MoS2)saturable absorber(SA) is demonstrated. The few-layer MoS2 is prepared by the chemical vapor deposition(CVD) method and then transferred onto the end face of a fiber connector to form a fiber-compatible Mo S2SA. The 20 th harmonic modelocked pulses at 216-MHz repetition rate are stably generated with a pulse duration of 1.42 ps and side-mode suppression ratio(SMSR) of 36.1dB. The results confirm that few-layer MoS2 can serve as an effective SA for mode-locked fiber lasers.
夏汉定李和平兰长勇李春邓光磊李剑峰刘永
关键词:MODE-LOCKING
Fiber chromatic dispersion measurement with improved measurement range based on chirped intensity modulation
2014年
A novel method for accurately measuring chromatic dispersion of optical fibers is proposed based on the use of chirped intensity-modulated signals.Unlike the conventional method,the proposed method utilizes the configurable transfer function of optical fibers caused by the residual chirp of intensity modulation,which not only eliminates the chirp error but also improves the measurement range through adjusting the chirp parameter of the intensity modulator.Our method is applicable for measuring both the magnitude and sign of chromatic dispersion of optical fibers or other dispersive devices at different operating wavelengths by using a vector network analyzer.
Shangjian ZhangXinhai ZouHeng WangYali ZhangHeping LiYong Liu
关键词:DISPERSIONINTENSITYNETWORK
基于十倍光学拉伸的5GHz微波信号模数转换研究(英文)被引量:2
2014年
利用光学时间拉伸法对微波信号进行降频处理,提高了后端电子模数转换器的有效模拟带宽和有效采样速率.设计了一套对5GHz微波信号十倍降频的光学时间拉伸模数转换系统.对色散导致的信号功率损耗特性以及调制引起的谐波失真进行了理论分析和数值仿真,结果表明:当系统带宽为5GHz时,光学时间拉伸引入的信号噪声失真比不会劣化后续电子模数转换器的有效位数,该模数转换系统的有效模带宽可达8GHz,有效采样率为200GS/s.
彭迪张旨遥杨帆袁飞刘永
关键词:模数转换器光子学色散谐波失真
Broadband ultrafast nonlinear optical response of few-layers graphene: toward the mid-infrared regime被引量:7
2015年
Gapless linear energy dispersion of graphene endows it with unique nonlinear optical properties, including broadband nonlinear absorption and giant nonlinear refractive index. Herein, we experimentally observed that fewlayers graphene has obvious nonlinear absorption and large nonlinear refraction, as investigated by the Z-scan technique in the mid-infrared(mid-IR) regime. Our study may not only, for the first time to our knowledge, verify the giant nonlinear refractive index of graphene(~10-7cm2∕W) at the mid-IR, which is 7 orders of magnitude larger than other conventional bulk materials, but also provide some new insights for graphene-based mid-IR photonics,potentially leading to the emergence of several new conceptual mid-IR optoelectronics devices.
Lili MiaoYaqin JiangShunbin LuBingxin ShiChujun ZhaoHan ZhangShuangchun Wen
Analog-to-digital converters using photonic technology被引量:7
2014年
This paper presents a brief review of photonic analog-to-digital converters(ADCs).Some typical schemes and operation principles of photonic ADCs,including photonic sampling ADCs,photonic quantizing ADCs,photonic sampling&quantizing ADCs and photonic assisted ADCs,are summarized and analyzed.In addition,some recent breakthrough results in the photonic ADCs are introduced.
Zhiyao ZhangHeping LiShangjian ZhangYong Liu
关键词:光子技术转换器ADC子采样
A novel two-stage spectral compression structure em-ploying a logarithmic DIF interconnected with an HNLF- NOLM
2014年
A novel two-stage spectral compression structure which employs a logarithmic dispersion increasing fiber (DIF) in- terconnected with a highly nonlinear linear fiber-nonlinear optical loop mirror (HNLF-NOLM) is proposed and dem- onstrated by numerical simulation. The numerical simulation is implemented by solving the generalized nonlinear SchrOdinger equation using split-step Fourier method, where the soliton number is in the range of 0.5≤N≤1.4. The re- suits show that the spectra are well-compressed and low-pedestal, and the maximum spectral compression ratio (SCR) can reach 10.93 when N=l.4.
陈颖俞夏琼郭连鹏陈向宁
关键词:SOLITONS
High-frequency characterization of an optical phase modulator with phase modulation-to-intensity modulation conversion in dispersive fibers
2012年
We propose a new method for characterizing optical phase modulators based on phase modulation-to-intensity modulation (PM-to-IM) conversion in dispersive fibers.The fiber dispersion spectrally alters the relative phasing of the phase-modulated signal and leads to the PM-to-IM conversion,which is extended to measure the modulation efficiency of optical phase modulators.In the demonstration,the frequency-dependent modulation index and half-wave voltage are experimentally measured for a commercial phase modulator.Compared with conventional methods,the proposed method works without the restriction of small-signal operations,and allows swept-frequency measurement with high resolution and accuracy by using a vector network analyzer.
ZHANG ShangJianLU RongGuoCHEN DeJunLIU ShuangLIU Yong
关键词:强度调制散纤维矢量网络分析仪扫频测量
微晶柱状CsI(Tl)闪烁薄膜的裂纹形貌研究(英文)被引量:2
2016年
掺铊碘化铯(CsI(Tl))闪烁薄膜因其具有连续致密的微晶柱结构而被广泛应用。该文采用真空热蒸镀方法在单晶硅(Si)衬底和多晶铂硅(Pt/Si)衬底上制备不同厚度的CsI(Tl)薄膜,研究不同衬底上薄膜厚度增加过程中微晶柱结构中出现的裂纹形貌。不同厚度的CsI(Tl)薄膜制备工艺条件相同。通过X射线衍射图谱(XRD)和扫描电子显微照片(SEM)表征CsI(Tl)薄膜的结晶质量和微晶柱结构形貌,研究不同衬底上CsI(Tl)薄膜的微晶柱结构在生长过程中发生的变化。建立CsI(Tl)薄膜的微结构模型研究单晶薄膜中晶面间距对薄膜微晶柱结构的影响。
刘爽郭丽娜谢翼骏张尚剑刘永
关键词:CSSEMXRD
Optical generation of high-power 0.1-THz continuous wave by external modulation
2012年
We experimentally demonstrate that a high-power 0.1-THz continuous wave can be generated by external modulation. A low-noise electrical amplifier and a W-band antenna with a gain of 25 dBi are employed to enhance photodiode output power. Detection power exceeds 1 mW when an absolute terahertz power meter is used.
郑之伟陆顺斌李瑛陈林文双春
关键词:DIODES
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