本文選題：空芯Bragg光纖 + 低折射率差　； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：高性能的多波長光纖激光器在光通信系統(tǒng)、光傳感領(lǐng)域有廣闊的應(yīng)用前景。而要在室溫下實(shí)現(xiàn)性能好、穩(wěn)定性高、制作容易的多波長摻鉺光纖激光器,需要尋找有效的方法抑制摻鉺光纖中的模式競爭�？招綛ragg光纖,不同于傳統(tǒng)光纖通過全內(nèi)反射來導(dǎo)光,而是通過包層的周期性結(jié)構(gòu)所引起的帶隙效應(yīng)來導(dǎo)光,因此具有低損耗、色散可控、非線性系數(shù)可調(diào)等許多優(yōu)點(diǎn),在光纖通信、色散補(bǔ)償、高功率激光傳輸領(lǐng)域中有著廣泛的應(yīng)用前景。本文以空芯Bragg光纖為突破口,對其開展了深入的理論和實(shí)驗(yàn)研究,并基于實(shí)際制作的空芯Bragg光纖,將空芯Bragg光纖用于光纖激光器中,實(shí)現(xiàn)了摻鉺光纖激光器在室溫下穩(wěn)定的單雙波長輸出,主要工作如下:1、采用傳輸矩陣法,建立了周期性平板波導(dǎo)的帶隙結(jié)構(gòu)理論仿真模型。在驗(yàn)證了該仿真模型準(zhǔn)確性的基礎(chǔ)上,采用該模型研究了空芯Bragg光纖的結(jié)構(gòu)參數(shù)對帶隙位置和帶隙寬度的影響,仿真結(jié)果表明,隨著包層數(shù)、折射率差的增大,包層限制光的能力逐漸增加,當(dāng)介質(zhì)層厚度滿足四分之一波長條件時(shí),將得到位于中心波長附近的最大帶隙寬度。該理論結(jié)果對空芯Bragg光纖的設(shè)計(jì)和實(shí)際制作具有重要的指導(dǎo)意義。2、從空芯Bragg光纖的實(shí)際制作工藝和拓展空芯Bragg光纖的實(shí)際應(yīng)用層面出發(fā),提出并設(shè)計(jì)了具有低折射率差、大芯徑的摻鍺空芯Bragg光纖。理論研究結(jié)果表明:該空芯Bragg光纖帶隙位置位于1550nm波段,最低損耗達(dá)4.5dB/m,帶隙譜為寬帶的梳狀譜輸出,可用作光纖濾波器對輸出激光進(jìn)行調(diào)制。3、通過合理的參數(shù)設(shè)計(jì),提出并設(shè)計(jì)了具有超寬帶、低損耗特性的空芯Bragg光纖。通過增大光纖尺寸,其帶隙范圍可覆蓋到4000nm,帶隙區(qū)損耗為10-8dB/m量級。該設(shè)計(jì)在現(xiàn)有制作工藝和制作材料的基礎(chǔ)上,實(shí)現(xiàn)了在常用傳輸窗口上的長距離低損耗傳輸,在光通信系統(tǒng)中有重要應(yīng)用前景。4、采用化學(xué)氣相沉積法成功拉制了低折射率差、大芯徑的摻鍺空芯Bragg光纖,并對實(shí)際拉制的光纖進(jìn)行了參數(shù)仿真,結(jié)果表明實(shí)際光纖在帶隙位置上向短波長方向偏移了 5nm,損耗增加了 1dB/m,符合預(yù)期設(shè)計(jì)。5、將空芯Bragg光纖實(shí)際應(yīng)用于光纖激光器中,實(shí)現(xiàn)了一種單雙波長可切換和可調(diào)諧的摻鉺光纖激光器,該激光器結(jié)構(gòu)簡單,在室溫下可實(shí)現(xiàn)、穩(wěn)定的單雙波長輸出,且邊摸抑制比高達(dá)50 dB。激光輸出穩(wěn)定性測試表明,在30分鐘內(nèi),激光波長漂移量均小于O.1nm,峰值功率波動量均小于2dB。
[Abstract]:High performance multi-wavelength fiber laser has broad application prospect in optical communication system and optical sensing field. In order to achieve good performance, high stability and easy fabrication of multi-wavelength erbium-doped fiber laser at room temperature, we need to find an effective way to suppress mode competition in erbium-doped fiber. The hollow Bragg fiber is different from the traditional fiber in guiding light through total internal reflection, but by the bandgap effect caused by the periodic structure of the cladding, so it has many advantages, such as low loss, controllable dispersion, adjustable nonlinear coefficient, etc. It is widely used in optical fiber communication, dispersion compensation and high power laser transmission. In this paper, the hollow Bragg fiber is used as the breakthrough point, and the theoretical and experimental research is carried out. Based on the practical hollow Bragg fiber, the hollow Bragg fiber is used in the fiber laser. The stable single and double wavelength output of erbium-doped fiber laser at room temperature is realized. The main work is as follows: 1. The theoretical simulation model of bandgap structure of periodic planar waveguide is established by using the transmission matrix method. On the basis of verifying the accuracy of the simulation model, the influence of the structural parameters of hollow Bragg fiber on the band gap position and the band gap width is studied by using the model. The simulation results show that the refractive index difference increases with the number of cladding layers. The ability of limiting light in the cladding increases gradually. When the thickness of the dielectric layer meets the condition of 1/4 wavelength, the maximum bandgap width near the central wavelength will be obtained. The theoretical results have important guiding significance for the design and practical fabrication of hollow Bragg fiber. Based on the practical fabrication technology of hollow Bragg fiber and the expansion of practical application level of hollow Bragg fiber, a low refractive index difference is proposed and designed. Large diameter germanium doped hollow Bragg fiber. The theoretical results show that the band gap of the hollow Bragg fiber is located in the 1550nm band, the minimum loss is 4.5 dB / m, the band gap spectrum is a broadband comb spectrum output, which can be used as a fiber filter to modulate the output laser. A hollow Bragg fiber with ultra-wideband and low loss characteristics is proposed and designed. By increasing the size of the fiber, the band gap can be covered to 4 000 nm, and the band gap loss is 10 ~ (-8) dB / m. Based on the existing fabrication process and materials, the design realizes long distance and low loss transmission on common transmission windows, and has important application prospects in optical communication system. The low refractive index difference is successfully drawn by chemical vapor deposition. The germanium doped hollow Bragg fiber with large core diameter is simulated. The results show that the actual fiber deviates 5 nm to the short wavelength direction in the band gap position, and the loss increases by 1 dB / m, which accords with the expected design. The hollow Bragg fiber is applied to the fiber laser. A single and double wavelength switched and tunable erbium-doped fiber laser is realized. The structure of the laser is simple and can be realized at room temperature. The output of single and double wavelengths is stable and the side touch rejection ratio is up to 50 dB. The laser output stability test shows that the wavelength drift is less than 0.1 nm and the peak power fluctuation is less than 2 dB within 30 minutes.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN253;TN248

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本文編號：2095677