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基于压电偏振控制器辅助POTDR的光纤弯曲半径测量研究

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铁道学报 2012年第2期34卷 47-51页

作者：杨双收吴重庆李政勇高凯强尚超北京交通大学发光与光信息技术教育部重点实验室北京100044 北京交通大学光信息科学与技术研究所北京100044

利用压电偏振控制器辅助POTDR(PPC-assisted POTDR)测量光纤不同弯曲半径下的双折射分布。在光纤弯曲半径不变的情况下,双折射系数仍然是一个随机变量,因此通过计算双折射系数并不能估算弯曲半径,必须对光纤进行多圈弯曲,通过平均双折... 详细信息

利用压电偏振控制器辅助POTDR(PPC-assisted POTDR)测量光纤不同弯曲半径下的双折射分布。在光纤弯曲半径不变的情况下,双折射系数仍然是一个随机变量,因此通过计算双折射系数并不能估算弯曲半径,必须对光纤进行多圈弯曲,通过平均双折射系数计算弯曲半径。提出引用计算被测弯曲半径的光纤双折射系数的分布函数与标准弯曲光纤(光纤标准弯曲半径为8cm)双折射系数分布函数的相关系数,来估算光纤的弯曲半径。这种方法有利于在光纤弯曲很复杂的情况下确定光纤的弯曲位置和弯曲半径。

关键词：光纤传感器压电偏振控制器辅助POTDR 相关系数双折射弯曲半径

An Encryption-Decryption Method Using XOR Gate Based on the XPM between O-Band and C-Band Light Waves

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Chinese Physics Letters 2009年第7期26卷 181-183页

作者：王亚平吴重庆王智王拥军杨双收 Institute of Optical Information Key Lab of Luminescence and Optical Information Technology (Ministry of education) Beijing Jiaotong University Beijing 100044

An all-optical encryption-decryption method using an exclusive-or gate based on the cross-phase modulation between O-band and C-band light waves is proposed. The feasibility of the encryptionecryption technique is verified by handling binary signals at 2.5 Gbps, with less than 3dB penalty of extinction ratio and i dB polarization dependent loss.

关键词： sea surface nonliear interaction numerical method

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测试光网络的突发信号源研究

北京交通大学学报 2010年第3期34卷 86-90页

作者：高凯强盛新志吴重庆石茵汀杨双收北京交通大学发光与光信息技术教育部重点实验室北京交通大学理学院光信息技术研究所北京100044

随着IP业务的增长,光接入网和交换网中的数据业务呈现明显的突发特征,需要一种反映实际突发性的光信号源.本文通过对突发数据包物理特征的分析,提出了一种生成数据包的方法,给出了由均匀分布产生某一概率分布数据包的证明.分析了光调制... 详细信息

随着IP业务的增长,光接入网和交换网中的数据业务呈现明显的突发特征,需要一种反映实际突发性的光信号源.本文通过对突发数据包物理特征的分析,提出了一种生成数据包的方法,给出了由均匀分布产生某一概率分布数据包的证明.分析了光调制器件的增益特性,提出改善突发信号质量的二级调制方法,并进行了相关实验,取得了预想的结果.

关键词：光网络全光信号处理调制器突发光信号源

Mueller matrix analysis for all optical fiber co-existence of birefringence-polarization dependent gain-mode coupling at a single wavelength

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Chinese Physics B 2011年第11期20卷 13-18页

作者：尚超吴重庆李政勇杨双收高凯强余贶琭冯震 Key Laboratory of Education Ministry on Luminescence and Optical Information Technology Institute of Optical InformationBeijing Jiaotong University

Birefringence （polarization-related phase-shift）, polarization dependent gain （PDG） and mode coupling are three factors that may synchronously influence the transmission of single-wavelength polarized light in optical fibers. This paper obtains a new Mueller matrix analysis, which can be used under conditions that all these three factors are existing and changing. According to our transmission model, the state of polarization （SOP） changes along an optical mierostructure fiber with co-existence of birefringence-PDG-mode coupling were simulated. The simulated results, which show the phenomena of SOP constringency, are in good agreement with previous theoretical analyses.

关键词： Mueller matrix birefringence polarization dependent gain mode coupling

Generalized Principal-State-of-Polarization Analysis and Matrix Model for Piezoelectric Polarization Controllers

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Chinese Physics Letters 2008年第4期25卷 1325-1328页

作者：李政勇吴重庆杨双收田昌勇赵爽王拥军 Institute of Optical Information Beijing Jiaotong University Beijing 100044 Key Laboratory of Luminescence and Optical Information of Ministry of Education Beijing Jiaotong University Beijing 100044

We introduce a generalized concept of principal state of polarization （PSP） to analyse the piezoelectric polarization controller （PPC） and find each PPC unit can be described by a rotation matrix determined by the PSP. Our PPC has three components, each made of a jaw and a piezoelectric actuator with the squeezing direction tilted 0°, 45° and 0°, which are driven by a tunable power supply. We demonstrate that all the polarization rotation angles are linear to driving voltages and the PSP of unit 2 is nearly orthogonal to others which are almost equal. Taking some approximate treatments we obtain the matrix model of our PPC with respect to three driving voltages. The average error of our theoretical model is 1.51°, and the polarization response time is 〈50 μs, which is promising to realize an open-loop control of polarization.

关键词： supernova explosion proto-neutron star shock wave

Distributed Measurement of Birefringence by P-OTDR Assisted with Piezoelectric Polarization Controller

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Chinese Physics Letters 2008年第9期25卷 3304-3306页

作者：杨双收吴重庆李政勇张人元孟庆文 Key Lab of Education Ministry on Luminescence and Optical Information Technology Beijing Jiaotong University Beijing 100044

We propose a new polarization sensitive optical time domain reflectometry （P-OTDR） setup assisted with a piezoelectric polarization controller （PPC）. The input state of polarization can be changed by varying the voltage of PPC without any rotatable instrument, and only one optical receiver is used to detect the backward beam. We measure a single mode fibre and get the distribution of birefringence along the SMF.

关键词： the power-law exponents precipitation durative abrupt precipitation change