摘要
分析了长周期光纤光栅（LPG）的啁啾特性和切趾特性，给出了基于LPG的增益平坦滤波器可调的理论依据。阐述了LPG的传感特性和金属外包层对其的影响，为动态增益平坦滤波器结构的原理提供理论支持。介绍了这种动态增益平坦滤波器的制作原理、制作过程和可调过程。这种滤波器结构简单、插损小、易于控制、可调范围宽、响应速度快以及重复性好。实验中的增益平坦滤波器在20～120℃内波长线性可调8nm；损耗峰值在20～60℃内变化小，而在60～100℃内变化大；带宽在20～60℃内变化较小，而在60～120℃内变化较大；可根据不同需要在不同的温度范围内调节滤波器的损耗峰值和带宽，实现增益平坦滤波器的动态可调。
The chirp and apodization characteristics of long-period grating（LPG） are analyzed,and the theoretic foundation of adjustable gain flattening filter based on LPG is provided. We expatiate the sensing characteristic of LPG and the influence of its metal over- cladding in order that we can provide theoretic support for the principle of this dynamic filter. The principle,manufacture process and regulation process of this filter are introduced in detail. This kind of filter keeps a lot of merits such as compact structure,small insert loss, fine controllability, wide adjusting range, rapid response rate, good repetitiveness and so on. In this paper,the wavelength of the filter is linearly adjustable for 8 nm at the range of 20 -120℃;the transmission loss has a small change at the range of 20--60 ℃ but a big one at the 60--100℃;the bandwidth also has a small change at the range of 20 60℃ but a big one at the 60--120℃. Thus,we can regulate the parameters of the filter at the different temperature range according to different requirement, and realize dynamic regulation of the gain flattening filter.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2006年第3期274-279,共6页
Journal of Optoelectronics·Laser
基金
国家"863"计划资助项目(2001AA120012)
关键词
长周期光纤光栅(LPG)
厚度渐变外包层
啁啾特性
增益平坦滤波器
动态可调
long-period gratings （LPG）
over-cladding of gradual change thickness
chirp characteristic
gain flattening filter
dynamic regulation
