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Investigation on wavelength switching of widely tunable SGDBR lasers

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Chinese Science Bulletin 2009年第20期54卷 3709-3715页

作者： JIANG Shan DONG Lei ZHANG RuiKang xie shizhong Accelink Technologies Co. Ltd. Wuhan 430074 China School of Information Science and Engineering Shandong University Jinan 250100 China Department of Electronic Engineering Tsinghua University Beijing 100084 China

The sampled-grating distributed Bragg reflector(SGDBR) laser is a typical and important photonic integrated device,and has potential wide application to agile optical networks.A new dynamic model for this device has been developed,which combines the traveling-wave method for the active region and the transfer-matrix method for the passive sections into a single *** behaviors of wave-length switching of the SGDBR laser,which include the transient spectrum and mode competition,have been studied in detail using this model.A new efficient way has been proposed to improve the wavelength switching performance only by increasing the coupling coefficients without changing the carrier density.

关键词：可调谐激光器分布布拉格反射镜光子集成器件动态模型波长交换取样光栅开关性能耦合系数

Serial wavelength division 1 GHz line-scan microscopic imaging

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Photonics Research 2014年第4期2卷 31-34页

作者： Fangjian Xing Hongwei Chen Cheng Lei Zhiliang Weng Minghua Chen Sigang Yang shizhong xie Tsinghua National Laboratory for Information Science and Technology(TNList) Beijing 100084China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China

A serial line scan microscopic imaging system with 1 GHz scan rate is proposed and *** method is based on optical time-stretch in dispersive fiber to realize superfast scan ***,a wavelength division technique is utilized to overcome the trade-off between high frame rate and spatial resolution caused by dispersion-induced pulse *** single frame is carved into two channels by optical filters and is detected in different wavelength bands ***,both channels are combined to reconstruct the whole *** this method,an imaging system with spatial resolution of 28μm at line scan rate of 1 GHz with chromatic dispersion of 1377 ps∕nm is *** has the potential to capture fast,nonrepetitive transient phenomena with a timescale of less than one nanosecond.

关键词： optical fiber dispersion

Simple photonic-assisted radio frequency down-converter based on opto- electronic oscillator

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Photonics Research 2014年第4期2卷 1-4页

作者： Hongchen Yu Minghua Chen Hongbiao Gao Cheng Lei Heng Zhang Sigang Yang Hongwei Chen shizhong xie Tsinghua National Laboratory for Information Science and Technology(TNList) Department of Electrical EngineeringTsinghua UniversityBeijing100084China

A photonic-assisted radio frequency(RF)down-converter integrating with the optoelectronic oscillator(OEO)-based high quality local oscillator(LO)has been proposed and experimentally *** LO and the RF input signal are mixed at the same phase modulator and photo-detector(PD)of the OEO-loop without any additional modulator or *** working bandwidth of the proposed RF down-converter is nearly from 2.5 to 10 *** performance of the proposed down-converter is presented and the spurious frequency dynamic range at frequency of 5.5 GHz with the LO at 6.138 GHz is measured to be 98.4 dB–Hz2∕*** influences that the frequency range and power of the RF input signal bring to the system are discussed as well.©2014 Chinese Laser Press.

关键词： modulator converter frequency

Study on the suppression of IFWM in 40 Gb/s WDM systems

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Frontiers of Optoelectronics 2008年第Z1期1卷 70-74页

作者： Yejin ZHANG Xiaoming SHI Nan MA Minghua CHEN Shuxu GUO shizhong xie Institute of Semiconductors Chinese Academy of Sciences College of Electronic Science and Engineering Jilin University Department of Electronics and Engineering Tsinghua University

The paper analyses the effects of intra-channel four-wave mixing(IFWM) on the high-speed optical fiber communication system. A new code format is developed with double 0 and double π phase separating 1 code; it can decrease the transmission penalty from fiber nonlinearity by counteracting the perturbation terms of IFWM. From the simulation of transmission of two classic code data‘‘11011'' and ‘‘11100'', we find that our proposed code format has a better suppression effect than the alternative modulation inversion(AMI) or the normal RZ format and supports a wider pulse mode. In a 40 Gbps system, the AMI format is 2 d B less than the RZ format, and our proposed format is 1 d B less than the AMI format when a1 dB eye open penalty is taken as a metewand. Moreover,it can be realized as easily as the AMI format.

关键词： wavelength division multiplex (WDM) 40 Gb/s intra-channel four-wave mixing (IFWM) nonlinear effect

2.4Gb/s,50Km Optical Fiber Transmission Using Ti:LiNbO_3 External Modulator

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High Technology Letters 1995年第1期1卷 44-47页

作者： xie shizhong Yang Zhixing xie Yong Chai Yanjie Liu Fenghai Yang Hui Wang Weidong Fan Chongcheng Zhou Bingkun (Dept.of Electronic Engineering,Tsinghua University,Beijing 100084,P.R.China) Tsinghua Univ Beijing China

2.488 Gb/s optical fiber transmission experiment using a domestic ***3 externalmodulator was demonstrated for the first time in China.A receiver sensitivity of -30.3dBmwas obtained at a BER of 10-10after transmission ... 详细信息

关键词： External modulator 2.488 Gb/s Optical fiber transmission

Improvement of phase coherence of optical pulse train based on fiber nonlinear effect

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Chinese Science Bulletin 2013年第7期58卷 617-620页

作者： GAO HongBiao CHEN MingHua CHEN HongWei xie shizhong Tsinghua National Laboratory for Information Science and Technology(TNList) Department of Electronic EngineeringTsinghua University

关键词：交叉相位调制高非线性光纤脉冲序列相干性非线性效应四波混频效应光纤激光器波长转换

240 km 10 Gbit/s CS-RZ Repeaterless Transmission over SSMF without Raman or Remotely Pumped Amplifiers

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光学学报 2003年第S1期23卷 529-530页

作者： Wendi Li, Yi Dong, Qi Zhang, Minghua Chen, shizhong xie Department of Electronic engineering, Tsinghua University, P. R. China, Tel: 86-10-62773197 Department of Electronic engineering Tsinghua University P. R. China

10Gbit/s repeaterless transmission over 240km SSMF using CS-RZ format is reported. No Raman or remotely pumped amplifiers are used in this experiment. Effect of channel space in multi-channel application is also inves... 详细信息

关键词： CS is on over km 10 Gbit/s CS-RZ Repeaterless Transmission over SSMF without Raman or Remotely Pumped Amplifiers dBm NRZ or

Simulation of Optical Models in Lightwave Links Using SPW

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Simulation of Optical Models in Lightwave Links Using SPW

Fiber optical parametric oscillator based on highly nonlinear dispersion-shifted fiber

1998 International Conference on Communication Technology

作者： Haocheng Zheng shizhong xie Zucheng Zhou Bingkun Zhou Dept.of Electronic Engineering Tsinghua University

ISBN: (纸本)7800908275

＜正＞In this article optical models in lightwave links,which include a LD（laser diode） source, a single-mode fiber and a p-i-n photodiode receiver model,are simulated and investigated using SPW（signal processing worksystem） on HP workstation. Simulation methods are presented concerning about the optical source waveforms,fiber attenuation and dispersion,and receiver *** end-to-end performance of typical transmission system is also presented. SPW software and its’ usage on HP workstation are introduced.

关键词： optical fiber transmission system LD single-mode fiber p-i-n photodiode SPW

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Frontiers of Optoelectronics 2013年第1期6卷 25-29页

作者： Sigang YANG Kenneth K. Y. WONG Minghua CHEN shizhong xie Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Electrical Engineering Tsinghua University Beijing 100084 China The Photonic Systems Research Laboratory Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong China

The development of fiber optical parametric oscillators (FOPO) based on highly nonlinear dispersion-shifted fiber is reviewed in this paper. Firstly, the background and motivation are introduced, and it is pointed out that the FOPO is promising to act as optical source in non-conventional wavelength bands. Subsequently, the context focuses principally on the problem of inherent multiple-longitudinal-mode characteristic of FOPO and the corresponding solutions to it. The primary technique is by locking the phase of multiple longitudinal modes. The first reported actively mode locked FOPO is also presented in this article. However, it is not probable to realize passively mode locked FOPO because of the random phase dithering of the pump required for suppressing stimulated Brillouin scattering. Furthermore, a regeneratively mode locked FOPO is demonstrated, which can generate wide band tunable radiation in nonconventional wavelengths. Besides mode locked FOPO, the single-longitudinal-mode FOPO is also introduced. Finally, potential future directions are discussed.

关键词： fiber optical parametric amplifier (FOPA) fiber optical parametric oscillator (FOPO) mode locking single longitudinal mode