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Influence of Multi-Cascaded Semiconductor Optical Amplifiers on the Signal in an Energy-Efficient System

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Chinese Physics Letters 2012年第1期29卷 123-125页

作者： CHEN Xiao-Yong SHENG Xin-Zhi wu chong-qing Key Lab of Luminescence and Optical Information Technology(Ministry of Education) Beijing Jiaotong UniversityBeijing 100044

Signal impairment is experimentally studied by using the extinction ratio (ER),error bit rate (BER) and optical spectrum in a three-cascaded semiconductor optical amplifier (SOA ) *** signal with the ER of 13 dB and BER of < 10^(-9) is achieved after the signal passing through the cascaded *** the results obtained from the experiment,we confirm that the three-cascaded SOAs used to compensate for power in the optical transmission can be *** experimental result also offers the possibility of achieving a higher throughput of multiplane architecture by exploiting three switching domains instead of two switching domains in the energy-efficient design of a scalable optical multi-plane interconnection *** space switches in output ports of multi-plane interconnection architecture can be improved to N =32×32 × 32 =32768.

关键词： interconnection Signal amplifier

Measurement of the Internal Loss Coefficient of Semiconductor Optical Amplifiers

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Chinese Physics Letters 2013年第5期30卷 172-175页

作者： LIU Guo-Dong wu chong-qing WANG Fu MAO Ya-Ya Institute of Optical Information Beijing Jiaotong UniversityBeijing 100044 Key Lab of Luminescence and Optical Information Technology(Ministry of Education) Beijing Jiaotong UniversityBeijing 100044

The internal optical loss in semiconductor optical amplifiers(SOAs)is investigated experimentally and theoretically over a wide injection current range.A new measurement method is proposed without noise figure ***,considering the internal loss in an SOA,a modified formula of the input-output characteristics is *** on the practically measured input-output characteristic curves,the internal loss coefficient of an SOA is measured at different injection *** results demonstrate that the internal loss coefficient of SOAs decreases with increasing injection current.

关键词： SOA injection Internal

Evaluation of Slow Light Periodic Signals Considering the Distortion in EDF

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Chinese Physics Letters 2014年第3期31卷 82-85页

作者： WANG wu chong-qing WANG Zhi LIU Guo-Dong LIU Lan-Lan SUN Zhen-Chao Institute of Optical Information and Key Lab of Luminescence and Optical Information Technology Beijing Jiaotong University Beijing 100044

Based on the fundamental harmonic phase delay, a new definition of fundamental harmonic fractional delay （FHFD） is proposed to evaluate slow light with the consideration of signal distortion, to eliminate the dependence on the choice of the reference point. By solving the rate equation of erbium-doped fiber （EDF）, it is shown that the slow light always accompanies the signal distortion when the periodic signal propagates in EDF, and FHFD depends on the signal distortion, as well as the average input power, the modulation depth and the length of EDF. The results of simulations and experiments indicate that the definition of FHFD is reasonable and effective to evaluate the slow light of periodic signals.

关键词： FIBERS RESEARCH SEMICONDUCTOR doping ERBIUM SLOW light PHYSICS research

A New Distributed Measurement of Birefringence Vectors by P-OTDR Assisted by a High Speed Polarization Analyzer

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Chinese Physics Letters 2011年第9期28卷 162-165页

作者： SHANG Chao wu chong-qing LI Zheng-Yong YANG Shuang-Shou Key Lab of Luminescence and Optical Information Technology(Ministry of Education) Beijing Jiaotong UniversityBeijing 100044

A new polarimetric optical time domain reflectometry(P-OTDR)measurement device assisted by a high speed polarization analyzer is designed and a new algorithm,which can be used to accurately measure the birefringence vector,is *** this method,only one measurement is required and the result is insensitive to the input state of *** 1-km single mode fiber(SMF)is measured and the distribution of the local birefringence vector along the SMF is obtained with a resolution of 2 cm.

关键词： OTDR polarization fiber

All-Optical Time Slot Interchange Using a Cascaded Optical Buffer

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Chinese Physics Letters 2012年第8期29卷 93-95页

作者： FENG Zhen SHENG Xin-Zhi wu chong-qing LI Zheng-Yong MAO Ya-Ya Key Lab of Luminescence and Optical Information Technology(Ministry of Education) Beijing Jiaotong UniversityBeijing 100044

A novel scheme of all-optical time slot interchanger employing two cascaded re-circulating optical buffers based on nonlinear polarization rotation in semiconductor optical amplifiers is *** experimental system exhibits full interchangeable capability on three 512-bit packets at 10 Gbits/***,each packet length is up to 123 ns with the maximum buffer depth 30%.

关键词： polarization optical Slot

Quality improvement of the dual-wavelength signals in DLOB via power equalization

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Optoelectronics Letters 2008年第5期4卷 361-364页

作者： TIAN Chang-yong wu chong-qing SUN Guang-na LI Xue LI Zheng-yong Key Lab. on Luminescence and Optical Information Technology of Education Ministry and Institute of Optical Information Beijing diaotong University Beijing 100044 China.

The data packet buffeting can be implemented in dual loop optical buffer （DLOB） through cross-phase modulation （XPM） between the control signal and the data packets. However, the output equality of dual wavelength signals will degrade due to the unbalanced gain and phase shift. This problem can be resolved by power oqualizafion using the saturation characteristics of SOA. The data packets with 2.5 Gb/s can be buffered in DLOB for 16 cycles corresponding to 16.5 μ*** extinction ratio of the output packet is 8 dB while the S/N is 8.1 dB.

关键词：双重波长信号功率同等化数据包振动缓冲器

Principal State Analysis for a Compact in-Line Fiber Polarization Controller

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Chinese Physics Letters 2013年第1期30卷 91-94页

作者： LI Zheng-Yong wu chong-qing WANG Zhi-Hao QIN Tao WANG Yi-Xu Key Lab of Education Ministry on Luminescence and Optical Information Technology and Institute of Optical Information Beijing Jiaotong UniversityBeijing 100044

A compact in-line fiber-based polarization controller(FPC)made of a rotatable fiber squeezer is investigated in detail with the Mueller matrix model established based on the generalized principal state of polarization(PSP).The PSP caused by the fiber squeezing is in the equator plane,which turns around S3 axis on the Poincarésphere when rotating the ***,a programmable polarization control method is proposed to realize the polarization conversion between arbitrary polarization states,in which only two parameters of phase shift and rotation angle need to be *** type of FPC,which has a highly compact structure,lower insertion loss,and can be directly embedded into any fiber devices without any extra delay,will be an ideal PC for high-speed optical communication and all-optical signal processing.

关键词： Poincaré Polarization rotating

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光纤型缓存器的研究进展

半导体光电 2007年第5期28卷 601-606页

作者：吴重庆北京交通大学光信息科学技术研究所北京100044

对评价全光缓存器的技术指标作了评述,指出数字光缓存器并不仅仅起拷贝作用,而且要满足同步以及读写控制等要求。阐述了前向型、反馈型、SBS慢光型以及光纤光栅等不同结构的光纤型全光缓存器的原理、优缺点以及存在问题,指出目前尚没有... 详细信息

对评价全光缓存器的技术指标作了评述,指出数字光缓存器并不仅仅起拷贝作用,而且要满足同步以及读写控制等要求。阐述了前向型、反馈型、SBS慢光型以及光纤光栅等不同结构的光纤型全光缓存器的原理、优缺点以及存在问题,指出目前尚没有任何一种全光缓存器达到比较理想的功能与指标,应该向一个综合的全光缓存系统发展。

关键词：全光缓存器光纤型全光缓存器慢光

低差分模式群时延少模光纤的变分法分析及优化

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物理学报 2022年第9期71卷 158-165页

作者：王健吴重庆北京交通大学发光与光信息技术教育部重点实验室光信息科学与技术研究所北京100044

基于少模光纤的模分复用技术可使传输容量增加数倍,是目前光纤通信系统的研究热点.当复用模式数量较多时,模式之间的串扰可在接收端采用多输入多输出数字信号处理算法解决.差分模式群时延(DMGD,DMGD)越大,算法复杂度越高,为了降低接收... 详细信息

基于少模光纤的模分复用技术可使传输容量增加数倍,是目前光纤通信系统的研究热点.当复用模式数量较多时,模式之间的串扰可在接收端采用多输入多输出数字信号处理算法解决.差分模式群时延(DMGD,DMGD)越大,算法复杂度越高,为了降低接收机的复杂度需要使用低DMGD的少模光纤.本文提出了使用变分法分析任意芯层折射率高于包层的少模光纤,推导出了这类光纤中基模的模斑尺寸、各个模式归一化传播常数、相对于基模的DMGD的解析表达式,以及它们与归一化频率和光纤制造参数的关系.在此基础上,以梯度型少模光纤为研究对象,优化了光纤参数,得到能够传输前6个LP模,在C和L波段|τ_(DMGD)|<15 ps/km的少模光纤的优化参数为:最大芯层折射率与包层折射率之差n_(1)-n_(2)=0.01,纤芯半径a=14μm,折射率分布指数α=1.975.最后讨论了光纤制造误差对DMGD的影响.

关键词：模分复用少模光纤变分法差分模式群时延