Author Affiliations
Abstract
College of Information Science and Electronic Engineering, Zhejiang University, HangZhou, 310027, China
We propose and demonstrate an ultrasensitive integrated photonic current sensor that incorporates a silicon-based single-mode-multimode-single-mode waveguide (SMSW) structure. This kind of SMSW structure is placed over a direct current carrying power resistor, which produces Joule’s heat to change the temperature of the SMSW and further results in the change of the effective refractive index between different propagating modes. Interference occurs when the modes recombine at the second single mode waveguide. Finally, the current variation is measured by monitoring the shift in the output spectrum of the multimode interferometer. In low current, the wavelength shift has almost linear dependence: Δλ∝Ic. This effect can be used as a current sensor with a slope efficiency of 4.24 nm/A in the range of 0–200 mA.
130.3120 Integrated optics devices 130.6010 Sensors 230.7380 Waveguides, channeled Chinese Optics Letters
2016, 14(3): 031301
1 浙江大学 信息与电子工程学系, 杭州 310027
2 浙江大学 唐仲英传感材料及应用中心, 杭州 310027
为了研究光纤消偏器的性能, 使用琼斯传输矩阵化简方法, 对2段、3段和4段Lyot光纤消偏器进行了理论分析和实验验证, 归纳出多段Lyot光纤消偏器光纤段数N与偏振度的数学关系式, 得出随着光纤消偏器段数增加其出射光偏振度有大幅降低的结论。结果表明, 4段Lyot消偏器出射光偏振度为普通两段Lyot消偏器出射光偏振度的1/4,方差从0.0951下降为0.0245。该结果证明了理论的正确性, 为实际制作多段Lyot消偏器提供了理论指导。
光纤光学 Lyot光纤消偏器 琼斯矩阵 多段保偏光纤 偏振度 fiber optics Lyot fiber depolarizer Jones matrix multi-section polarization maintaining optical fib degree of polarization
Author Affiliations
Abstract
A Sagnac loop filter with two pieces of high birefringence fiber having equal lengths, and spliced together at a fixed angle of 30o displacement between the two principle axes, is proposed in this letter. Gain equalization of erbium-doped fiber amplifiers (EDFAs) is implemented by tuning only the polarization controller in the loop filter. Experimental result shows that there remains a deviation of \pm 1 dB in the region of the flattened profile with the useful bandwidth of about 23 nm, thereby demonstrating the effectiveness of the method. An effective mathematical model and mechanism is also given for further explanation.
060.2320 Fiber optics amplifiers and oscillators 060.2280 Fiber design and fabrication 260.1440 Birefringence Chinese Optics Letters
2012, 10(7): 070604
1 深圳大学电子科学与技术学院, 深圳市微纳光子信息技术重点实验室, 广东 深圳 518060
2 浙江大学信息与电子工程系, 浙江 杭州 310027
谐振式光纤陀螺(R-FOG)中, 偏振波动引起的检测信号漂移对陀螺系统的检测精度有重要影响。通过矩阵法, 分析系统中光纤耦合器不同偏振本征态(ESOPs)的耦合系数差异, 与所引起的系统零偏的关系, 得到其与两个偏振本征态耦合系数以及光纤环形谐振腔参数间的解析表达式。利用该解析表达式, 求解系统零偏为极值时, 耦合器不同偏振本征态的最佳耦合系数；该最佳耦合系数仅与光纤环形谐振腔的损耗参数有关。通过Matlab软件进行数值拟合, 得到不同偏振本征态耦合系数与系统零偏之间的关系曲线。从理论上建立耦合器耦合系数偏振相关引起的噪声模型。利用该理论模型, 对已报道的R-FOG开环实验系统中偏振波动引起的系统零偏进行了估算。
传感器 谐振式光纤陀螺 偏振本征态 偏振波动 零偏
浙江大学信息与电子工程系, 浙江 杭州 310027
解调算法在Sagnac干涉仪系统中占有重要地位。目前已经提出的一些数字开环解调算法在运算过程中时常会出现某些特殊相位点互相混淆的问题, 这会导致系统输出错误的解调结果。在对特殊相位点的产生原理进行理论分析的基础上, 设计了一种以集成电路芯片为核心的虚拟光纤Sagnac干涉仪系统。该系统可以便捷地解决使用光纤Sagnac干涉仪难以对特殊相位点进行检测的问题, 同时, 可以方便地判别解调系统在这些特殊相位点是否会发生错误解调。最后, 利用该虚拟Sagnac干涉仪对一种数模混合解调系统进行了特殊相位点测试。并通过实验测得该虚拟光纤Sagnac干涉仪的标度因数为49.9°/V; 标度因数的非线性度为0.167%, 标度因数的不对称度为0.088062%, 零漂小9.5265°/h。
微弱信号检测 虚拟光纤Sagnac干涉仪 数模混合解调 特殊相位点
Author Affiliations
Abstract
College of Information Science and Engineering, Zhejiang University, Hangzhou 310027
A tunable erbium-doped fiber ring laser employing an all-polarization-maintaining fiber loop filter is proposed and demonstrated. The lasing frequencies can be selected by properly adjusting the polarization controller in the cavity.
140.3600 lasers tunable 140.3560 lasers ring 060.2320 fiber optics amplifiers and oscillators 060.2410 fibers erbium Chinese Optics Letters
2005, 3(10): 10600
