Long period fiber grating (LPFG) is a new kind of optical fiber element.
长周期光纤光栅是一种新型光纤器件。
The main mechanisms of femtosecond laser inscription LPFG are discussed.
介绍了利用飞秒激光器刻写长周期光纤光栅的基本方法。
The axial distribution for mode fields of the LPFG is analyzed and researched.
分析研究了长周期光纤光栅轴向的模场变化。
The progress in fabrication method of long period fiber grating (LPFG) is introduced.
介绍了长周期光纤光栅制作技术上的进展。
Metal coated long period fiber gratings (LPFG) can be used to change the resonance wavelength.
金属包层长周期光纤光栅可用于对谐振波长的调谐。
The CO2 laser incident on the fiber result in an asymmetric refractive-index distribution within the cross-section of the LPFG.
分析了单侧CO2激光脉冲曝光导致长周期光纤光栅横截面折射率分布的不均匀性。
The transverse load characteristics of twisted long-period fiber grating (LPFG) written by high-frequency CO2 laser pulses was demonstrated.
研究了高频CO2激光脉冲写入的长周期光纤光栅在扭曲状态下的横向负载特性。
A polarization insensitive LPFG operating at a specific wavelength is achieved by writing the LPFG in a birefringence fiber, for the first time.
首次发现了在双折射光纤中写入的长周期光纤光栅存在对偏振不敏感的谐振峰。
However, the numerical analysis of coupled-mode equation with self-coupling coefficient is demanded for the insight of the spectral of LPFG coupler.
但当侧重频谱的具体特性时，则必须采用考虑自耦合系数的耦合方程组的数值解进行优化设计。
Both acrylate-based polymer and silicone resin were proposed as recoating materials for broadband wavelength tuning and temperature compensation of LPFG.
分别采用丙烯酸类聚合物与硅树脂材料实现了长周期光纤光栅（LPFG）的大范围波长调谐与温度补偿。
Theoretical analysis and numerical simulation of transmission spectral characteristics is a good reference to the fabrication and sensor application of LPFG.
文中同时对长周期光纤光栅的光谱特性进行分析和数值模拟，为长周期光纤光栅的制作和传感研究提供理论参考。
Based on the coupled-mode theory, the transfer-matrix method is used to calculate the transmission spectra of phase-shifted long-period fiber gratings (LPFG).
应用耦合模理论和传输矩阵法计算模拟了长周期光纤光栅的透射谱，并对其进行了切趾优化。
A method to analyze the resonant wavelength and damping decrement of the transmission spectrum of long period fiber grating (LPFG) with bending curvature was reported.
报道了一种分析长周期光纤光栅(LPFG)透射谱谐振波长和衰减率随弯曲曲率变化的方法。
This paper introduces the research and development of LPFG, analyzes LPFG s characteristics and introduces its application model and problems to be solved in communication.
文中介绍了LPFG的研究方法和最新研究进展，分析了LPFG的特性并运用其特征给出了LPFG在通信中的应用模式及需克服的问题。
In comparison with other schemes, advantages of the LPFG based devices and an important role of the LPFG in communication and sensing technology are demonstrated in detail.
并通过与其他方案对比，说明了基于长周期光纤光栅器件的优点，肯定了长周期光纤光栅在通信传感领域的价值。
Quantitative analysis shows that the temperature and strain sensitivities or shift direction of resonant wavelength for LPFG are dependent on fiber types and coupling mode orders.
定量分析表明谐振波长的温度和轴向应变灵敏度及其变化方向与光纤类型、模式耦合的阶次等因素有关。
Quantitative analysis shows that the temperature and strain sensitivities or shift direction of resonant wavelength for such a LPFG are dependent on fiber types and coupling mode orders.
定量分析表明谐振波长的温度和轴向应变灵敏度及其变化方向与光纤类型、模式耦合的阶次等因素有关。
The strain sensitivity characteristic of long-period fibre grating (LPFG) was studied by coupled-mode theory and the strain sensitivity analytic equation of the resonant wavelength was deduced.
对长周期光纤光栅传输谱谐振波长的应变特性用耦合模理论进行研究，推导出谐振波长应变灵敏度的解析表达式。
Then the simplified model for the LPFG is deduced with ignoring longitudinal coupling of modes and coupling of cladding modes themselves, and also assuming the modulation of refractive index exis...
忽略轴向的模式耦合以及包层模式之间的相互耦合作用，并认为折射率指数的调制只存在于纤芯中，建立了简化的长周期光纤光栅数学模型。
Through the curve of resonant wavelength versus period, we present a new method to analyze the shift of resonant wavelength of LPFG during UV laser writing without solving the coupled-mode equations.
它通过常见的谐振波长与周期的关系曲线，不用解耦合模方程就可以直接分析LPFG的振波长的漂移和调谐特性。
Through the curve of resonant wavelength versus period, we present a new method to analyze the shift of resonant wavelength of LPFG during UV laser writing without solving the coupled-mode equations.
它通过常见的谐振波长与周期的关系曲线，不用解耦合模方程就可以直接分析LPFG的振波长的漂移和调谐特性。
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