基于光纤光栅Sagnac环微波光子滤波器的研究

发布时间：2018-01-08 11:34

本文关键词：基于光纤光栅Sagnac环微波光子滤波器的研究　出处：《上海师范大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着光通信及光纤传感技术的迅速发展,特别是波分复用(WDM)和密集波分复用(DWDM)系统的广泛应用,梳状光纤滤波器研究一直是光纤通信乃至光电子领域的一个研究热点。光纤Sagnac环本身有滤波特性,具有结构简单、成本低、稳定性好、调谐范围大等优点。光纤光栅具有可灵活设计的反射光谱带宽、附加损耗小、体积小以及与光纤兼容技术成熟、成本低等特性,被广泛应用于光纤通信和光纤传感的各种滤波或选频等器件中。由光纤光栅和Sagnac环可以构成梳状滤波器,实现各种不同的滤波特性。本文着重提出并研究了一种新型的基于取样光纤光栅的Sagnac环微波光子滤波器和一种新型的基于相移光纤光栅的Sagnac环微波光子滤波器的设计、建模、仿真、优化等,详细讨论了各器件参数对该滤波器的光谱特性的影响。本文主要创新点和研究内容如下:(1)研究了微波光子滤波器的发展,对一般的光纤Sagnac环滤波器进行了理论和数值研究。利用传输矩阵法研究了光纤Sagnac环以及基于均匀光纤光栅的Sagnac环微波光子滤波器的传输特性,并进行MATLAB数值仿真和分析。(2)首先利用Jones矩阵法,对取样光纤光栅的反射光谱进行详细的理论研究和数值仿真,在此基础上,提出一种新型的基于取样光纤光栅的Sagnac环微波光子滤波器的设计,建立了理论分析模型,并进行详细的理论推导,利用MATLAB软件进行了相关的数值模拟,着重研究了基于取样光纤光栅的Sagnac环微波光子滤波器的透射光谱特性,以及各种关键器件参数(光纤环臂差、取样周期、折射率调制深度和占空比等)对所设计滤波器的输出光谱的影响。在大量数值模拟的基础上,优化取样光纤光栅的长度L、光纤环臂差DL和取样周期P等关键参数的数值,设计了六种不同的滤波器,它们具有分立谱线、高反射率、等间隔的不同通道数目窄带梳状透射谱,且具有良好的波长选择性和信道隔离度。可以实现16通道的100GHz的DWDM系统和8通道的200GHz的DWDM系统的窄带滤波;可以制成双波长的光纤激光器,用于太赫兹波的产生;能得到单峰的窄带透射谱,可应用于分布式传感系统中。(3)提出了另一种新型的基于相移光纤光栅的Sagnac环微波光子滤波器的设计,建立了理论分析模型,利用Jones矩阵法进行理论推导,在MATLAB软件平台上进行数值仿真,着重研究了该滤波器的输出光谱特性,详细分析了一些重要参数如光纤环臂差、相移量的大小、相移的位置和相移的数目等对透射光谱的影响。可以得到关于中心波长Bl近似对称、通道数目和阻带带宽可调节的双峰带通梳状滤波器。
[Abstract]:With the rapid development of optical communication and optical fiber sensing technology, especially the wide application of wavelength division multiplexing (WDM) and dense wavelength division multiplexing (DWDM) systems. Comb fiber filter has been a research hotspot in the field of optical fiber communication and optoelectronics. The fiber Sagnac ring has the characteristics of filtering, simple structure, low cost and good stability. Fiber Bragg grating has the advantages of flexible design of reflectance spectrum bandwidth, small additional loss, small volume, mature technology compatible with fiber, low cost and so on. It is widely used in optical fiber communication and optical fiber sensing devices such as filter or frequency selection. The comb filter can be made up of fiber grating and Sagnac loop. In this paper, a novel Sagnac ring microwave photonic filter based on sampled fiber grating and a new type of Sagna based on phase-shifted fiber grating are proposed and studied. Design of C-ring microwave photonic filter. Modeling, simulation, optimization and so on, the effects of device parameters on the spectral characteristics of the filter are discussed in detail. The main innovation and research contents of this paper are as follows: 1) the development of microwave photonic filter is studied. The general fiber Sagnac loop filter is studied theoretically and numerically. The optical fiber Sagnac loop and the Sagnac ring microwave photonic filter based on uniform fiber grating are studied by using the transfer matrix method. The transmission characteristics of the device. MATLAB numerical simulation and analysis. 2) firstly, the reflection spectrum of sampled fiber Bragg grating is studied and numerically simulated by Jones matrix method in detail. A novel Sagnac ring microwave photonic filter based on sampled fiber gratings is proposed. The theoretical analysis model is established and the theoretical derivation is given in detail. The transmission spectrum of Sagnac ring microwave photonic filter based on sampled fiber grating is studied by using MATLAB software. And the influence of various key device parameters (fiber ring arm difference, sampling period, refractive index modulation depth and duty cycle) on the output spectrum of the designed filter. Based on a large number of numerical simulations. By optimizing the values of the key parameters such as the length of the sampled fiber grating (L), the ring arm difference (DL) and the sampling period (P), six different filters are designed, which have discrete spectral lines and high reflectivity. The number of channels with equal spacing is narrow band comb transmission spectrum. With good wavelength selectivity and channel isolation, narrowband filtering for 16-channel 100GHz DWDM system and 8-channel 200GHz DWDM system can be realized. Two-wavelength fiber laser can be made for the generation of terahertz wave. A novel Sagnac ring microwave photonic filter based on phase-shifted fiber grating is proposed. The theoretical analysis model is established, the theoretical derivation is carried out by using Jones matrix method, and the numerical simulation is carried out on the platform of MATLAB. The output spectral characteristics of the filter are emphatically studied. The effects of some important parameters, such as fiber ring arm difference, the magnitude of phase shift, the position of phase shift and the number of phase shifts, on the transmission spectrum are analyzed in detail. The approximate symmetry of the center wavelength Bl can be obtained. Bimodal band-pass comb filter with adjustable channel number and stopband bandwidth.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253;TN713

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