本文選題：光纖布拉格光柵　切入點(diǎn)：聲光調(diào)制器　出處：《北京交通大學(xué)》2015年碩士論文

【摘要】：光纖布拉格光柵型聲光調(diào)制器以其調(diào)諧范圍寬、響應(yīng)速度快、插入損耗小等優(yōu)點(diǎn),被廣泛應(yīng)用于光纖通信和光纖傳感等領(lǐng)域。快速有效地獲得光纖布拉格光柵型光器件的光譜特性,對(duì)于優(yōu)化設(shè)計(jì)復(fù)雜結(jié)構(gòu)的光纖光柵有著重要的意義。 本文將工程上廣泛使用的V-I傳輸矩陣法應(yīng)用于對(duì)光纖布拉格光柵型聲光調(diào)制器的理論分析中,并將該理論應(yīng)用于非均勻布拉格光柵型聲光調(diào)制器的特性分析,主要的研究?jī)?nèi)容如下： 1.對(duì)于光纖光柵的四種常見(jiàn)分析方法,即耦合模法、傳輸矩陣法、傅立葉變換法以及多層膜法進(jìn)行了詳盡的理論推導(dǎo),并在此基礎(chǔ)上建立了分析光纖光柵光譜特性的V-I傳輸矩陣法模型,與現(xiàn)有的分析方法相比,該模型算法簡(jiǎn)單、求解更加容易,能夠快速得出聲光調(diào)制器的傳輸特性。 2.采用V-I傳輸矩陣法模型,分析了超聲波頻率和聲致應(yīng)變幅度對(duì)均勻光纖布拉格光柵型聲光調(diào)制器的反射譜的影響,得出了主次反射峰間的波長(zhǎng)間隔與超聲波頻率之間的增長(zhǎng)系數(shù)為0.145nm/MHz,且反射峰的反射率隨著聲致應(yīng)變幅度的改變而呈周期性變化。同時(shí)與其他方法比較,突出了V-I傳輸矩陣法的有效快速性。 3.針對(duì)啁啾以及相移兩種非均勻光纖布拉格光柵型聲光調(diào)制器,提出了采用V-I傳輸矩陣法分析因超聲波頻率和聲致應(yīng)變幅度引起的折射率分布變化對(duì)反射譜的影響,獲得了主次反射峰間的波長(zhǎng)間隔與超聲波頻率之間的關(guān)系,以及反射峰的反射率與聲致應(yīng)變幅度間的變化規(guī)律。并利用剪切模PZT產(chǎn)生縱向聲波,使用頻率為2MHz的超聲波對(duì)啁啾光纖布拉格光柵進(jìn)行調(diào)制,實(shí)驗(yàn)結(jié)果與仿真結(jié)果相致。
[Abstract]:Fiber Bragg grating type acousto-optic modulator has the advantages of wide tuning range, fast response speed and low insertion loss. It is widely used in optical fiber communication and optical fiber sensing. It is very important to obtain the spectral characteristics of fiber Bragg grating devices quickly and effectively for optimizing the design of fiber Bragg grating with complex structure. In this paper, the V-I transfer matrix method widely used in engineering is applied to the theoretical analysis of fiber Bragg grating type acousto-optic modulator, and the theory is applied to the characteristic analysis of non-uniform Bragg grating type acousto-optic modulator. The main contents of the study are as follows:. 1. Four common analysis methods of fiber grating, namely coupling mode method, transmission matrix method, Fourier transform method and multilayer membrane method, are derived in detail. A V-I transmission matrix model for analyzing the spectral characteristics of fiber Bragg gratings (FBG) is established. Compared with the existing analysis methods, the proposed model is simpler and easier to solve, and the transmission characteristics of the acousto-optic modulator can be obtained quickly. 2. The influence of ultrasonic frequency and acousto-induced strain amplitude on the reflectance spectrum of the uniform fiber Bragg grating type acousto-optic modulator is analyzed by using V-I transmission matrix method. The growth coefficient between the wavelength interval between the primary and secondary reflection peaks and the ultrasonic frequency is 0.145 nm / MHz, and the reflectivity of the reflection peak changes periodically with the change of the amplitude of the acoustic strain. At the same time, it is compared with other methods. The efficiency and rapidity of V-I transmission matrix method are highlighted. 3. Aiming at two kinds of non-uniform fiber Bragg grating acousto-optic modulators, the V-I transmission matrix method is proposed to analyze the influence of the refractive index distribution caused by the ultrasonic frequency and the sonic strain amplitude on the reflectance spectrum. The relationship between the wavelength interval between the primary and secondary reflection peaks and the ultrasonic frequency, as well as the relationship between the reflectivity of the reflection peak and the amplitude of the acoustic strain are obtained. The longitudinal acoustic waves are generated by using the shear mode PZT. The chirped fiber Bragg grating (FBG) is modulated by ultrasonic wave with frequency 2MHz. The experimental results are consistent with the simulation results.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN761

【共引文獻(xiàn)】

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