机械致长周期光纤光栅器件的研究

发布时间：2018-05-17 09:30

本文选题：长周期光纤光栅 + 机械致　；参考：《浙江工业大学》2015年硕士论文

【摘要】：长周期光纤光栅(LPFG)具有许多的优点,在光纤通信、光纤传感器等领域有着广阔的应用前景,是近几年发展最快的光纤无源器件之一。机械致长周期光纤光栅(MLPFG)可以克服传统方法,如紫外曝光法等,制作长周期光纤光栅时,只能具有固定的光栅周期、滤波效率和光栅长度等缺点,可用来实现制作简单、调谐方便、成本低廉以及可重构的LPFG。论文首先设计了一种新型串联式长周期光纤光栅带通带阻滤波器。通过将一个带有反射端面的空芯光纤(HOF)以串联的方式熔接在两个相同LPFG的光纤中间,同时实现带通和带阻滤波,以避免并列LPFG耦合器结构中,通过倏逝波耦合时低效率问题。其次通过利用普通的压簧对光纤施加压力,得到了一种机械致长周期光纤光栅(MLPFG)。研究了该MLPFG的带阻滤波特性,包括传输光谱与压力的关系、光纤单位长度上的压力与谐振波长、传输透过率和半高全宽(FWHM)的关系。其谐振波长处的透过率最低值为0.01,半高全宽最小值为29nm,在1540-1580nm范围内实现了调谐。该MLPFG还具有以下特点:一是谐振波长处的损耗峰振幅可随压力变化而变化,二是可通过改变压簧节距即光栅周期来灵活地改变谐振波长。由于光栅的制作不会给光纤的物理结构和特性带来永久性改变,因此该器件具有可重构性,有望作为光纤滤波器应用于光通信和光传感领域。
[Abstract]:Long period fiber Bragg grating (LPFG) has many advantages. It has a broad application prospect in optical fiber communication, fiber sensor and so on. It is one of the fastest developing passive optical devices in recent years. Long period fiber grating (MLPFG) can overcome traditional methods, such as UV exposure, and can only have long period fiber Bragg grating. A novel series type long period fiber Bragg band-pass bandpass filter is designed for simple, convenient, low-cost and reconfigurable LPFG. paper, which is designed for simple fabrication, convenient tuning, low cost, and reconfigurable. A series of hollow fiber (HOF) with reflective end surface is fused in series. In the middle of two same LPFG optical fibers, band pass and band resistance filter are simultaneously realized to avoid the low efficiency problem in the parallel LPFG coupler structure, through the evanescent wave coupling. Secondly, a mechanical long period fiber Bragg grating (MLPFG) is obtained by using the ordinary pressure spring to apply the pressure to the fiber. The band resistance filtering characteristics of the MLPFG are studied. The relationship between the transmission spectrum and the pressure, the pressure on the unit length of the fiber and the resonant wavelength, the transmission transmission and the half full width (FWHM). The minimum transmittance of the resonant wave length is 0.01, the minimum value of the half height is 29nm, and the tuning is realized in the 1540-1580nm range. The MLPFG also has the following characteristics: first, the loss of the length of the resonant wave. The peak amplitude can vary with the pressure change, and the two is that the resonant wavelength can be flexibly changed by changing the reed pitch, that is, the grating period. Because the fabrication of the grating does not bring about permanent changes in the physical structure and characteristics of the optical fiber, the device has reconfigurability and is expected to be used as a fiber filter in the field of optical communication and optical sensing.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

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