本文選題：全光3R再生技術(shù)　切入點(diǎn)：法布里-珀羅腔　出處：《江南大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著信息技術(shù)的發(fā)展,光纖通信的傳輸速率越來越快,當(dāng)速率超過40Gbit/s時,由于電子瓶頸的存在,必須使用全光器件對惡化的光信號進(jìn)行全光3R再生,這就使得全光3R再生中的時鐘提取技術(shù)變得十分重要。本文中對利用F-P腔進(jìn)行全光時鐘提取方案展開研究。針對光纖光柵進(jìn)行優(yōu)化。利用光纖光柵優(yōu)化恢復(fù)出的時鐘的效果,得到效果較好的單波長時鐘信號。首先利用F-P腔的結(jié)構(gòu)分析了光在腔內(nèi)的傳輸方式,推導(dǎo)出F-P腔的傳輸方程,給出了F-P腔的重要參數(shù)自由光譜區(qū)fFSR以及精細(xì)度F。在反射率R不同的時候?qū)-P腔的功率譜進(jìn)行了仿真,得出了R越大,透射窗口越窄的結(jié)論,并研究了精細(xì)度F和R之間的關(guān)系,得出了大約在R=0.95時,精細(xì)度有一個飛速的提升,之后通過耦合模理論研究并分析了光纖光柵的基本原理,直接求解均勻光柵以及通過傳輸矩陣法啁啾光柵的耦合模方程,并使用Matlab仿真出各種光柵的反射譜。其次通過參變量值的改變來研究光柵的特性。著重研究了長度、折射率調(diào)制深度、均勻光柵的有效折射率;啁啾光柵的啁啾系數(shù)分別對反射率峰值、帶寬、時延抖動的影響。對光纖光柵F-P腔進(jìn)行仿真,研究了在兩個光柵完全相同時光柵長度,折射率調(diào)制深度,腔長以及有效折射率的改變對反射譜的影響;兩個光柵的光柵長度以及折射率調(diào)制深度分別不同時對反射譜的影響。之后,針對啁啾光柵反射譜頂端存在著抖動的情況,首先使用常用切趾技術(shù)進(jìn)行優(yōu)化,發(fā)現(xiàn)了其切趾后帶寬變小,傾斜度增加,隨后使用對稱切趾對上述情況進(jìn)行改進(jìn),發(fā)現(xiàn)對稱切趾對于帶寬和傾斜度有一定的補(bǔ)償,但是頂端仍然存在抖動,引申出采取非對稱切趾技術(shù)做進(jìn)一步的改進(jìn),將光柵分成三段并通過研究高斯控制參數(shù)a和切趾前后半高全寬的變化以及切趾前后平均時延波動的變化得到每一段的最佳高斯控制參數(shù)分別為a1=8,a2=4,a3=5最終利用其作出啁啾光柵的仿真。最后,利用普通F-P腔進(jìn)行40GHz的光時鐘信號的提取,并比較平面鏡的反射率R分別是0.9、0.93、0.99、0.999時恢復(fù)出的時鐘信號的頻域圖和時域圖,得出精細(xì)度越大恢復(fù)出的時鐘效果越好的結(jié)論。但精細(xì)度過大時,透射窗口很窄,將會導(dǎo)致難以對準(zhǔn),且優(yōu)化效果并不明顯,所以選用R=0.99繼續(xù)后續(xù)研究。由于單波長的時鐘信號只要約0.96nm的帶寬,首先嘗試使用光纖光柵F-P腔進(jìn)行單波長時鐘信號的提取,但是其透射窗口的不可控故此種方案的不可行。隨后改用光柵先對光信號進(jìn)行濾波,但是光柵反射譜都不是理想的帶通濾波器,所以進(jìn)入F-P腔的信號存在抖動,時鐘提取效果不理想,并指出實(shí)際應(yīng)用中均勻光柵在切趾后,帶寬很難達(dá)到0.96nm。最終利用第四章的切趾技術(shù)消除啁啾光柵的反射譜頂端的不平坦后,結(jié)合第三章的啁啾光柵特性通過增加折射率調(diào)制深度到Δneff=1*10-4增大其反射率峰值,以獲得更好的恢復(fù)效果。
[Abstract]:With the development of information technology, the transmission rate of optical fiber communication is getting faster and faster. When the rate exceeds 40Gbit / s, due to the existence of electronic bottleneck, it is necessary to use all-optical devices to regenerate the deteriorating optical signal. This makes the clock extraction technique of all-optical 3R regeneration very important. In this paper, the scheme of all-optical clock extraction using F-P cavity is studied. A good single wavelength clock signal is obtained. Firstly, the optical transmission mode in the cavity is analyzed by using the structure of the F-P cavity, and the transmission equation of the F-P cavity is derived. The important parameters of F-P cavity, fFSR and fineness F, are given. The power spectrum of F-P cavity is simulated when the reflectivity R is different. It is concluded that the bigger R is, the narrower the transmission window is. The relationship between fineness F and R is studied. It is concluded that the fineness increases rapidly at about 0.95, and then the basic principle of fiber grating is studied and analyzed by coupling mode theory. The coupled mode equations of uniform grating and chirped grating by transfer matrix method are solved directly, and the reflectance spectra of various gratings are simulated by using Matlab. Secondly, the characteristics of grating are studied by changing the values of parameter variables. The modulation depth of refractive index, the effective refractive index of uniform grating, the effect of chirped coefficient of chirped grating on the peak reflectivity, bandwidth and delay jitter, respectively. The effects of grating length, refractive index modulation depth, cavity length and effective refractive index on the reflectance spectrum are studied when the two gratings are identical. The grating length and refractive index modulation depth of the two gratings have different effects on the reflection spectrum at the same time. Then, aiming at the jitter at the top of the reflection spectrum of the chirped grating, the commonly used apodization technique is used to optimize the reflection spectrum. It is found that the bandwidth becomes smaller and the inclination increases after the toe is cut, and then the symmetrical toe is used to improve the above situation. It is found that the symmetrical toe has some compensation for the bandwidth and inclination, but there is still jitter at the top. The adoption of asymmetric toe cutting is further improved, The grating is divided into three sections. By studying the variation of Gao Si control parameter a and half full width before and after apodization, and the variation of average delay fluctuation before and after toe cutting, the optimal Gao Si control parameters of each segment are obtained as follows: a 1 / 8 a 2H 4A 3N 5, respectively. Simulation of chirped gratings. Finally, The optical clock signal at 40GHz is extracted by ordinary F-P cavity, and the reflectivity R of the plane mirror is 0.93U 0.990.999.The frequency domain and time domain diagram of the clock signal recovered by 0.999 are compared. It is concluded that the more fineness the recovery, the better the clock effect. But when the fineness is too high, the transmission window is very narrow, which will lead to the difficulty of alignment, and the optimization effect is not obvious. So we choose RP0.99 to continue the follow-up research. Because the single wavelength clock signal is only about 0.96 nm bandwidth, we first try to use the fiber grating F-P cavity to extract the single-wavelength clock signal. But the transmission window is not controllable, so this scheme is not feasible. Then the grating is used to filter the optical signal, but the reflection spectrum of the grating is not an ideal bandpass filter, so the signal entering the F-P cavity has jitter. The clock extraction effect is not satisfactory, and it is pointed out that the bandwidth of uniform grating is very difficult to reach 0.96 nm in practical application. Finally, the uneven top of the reflection spectrum of chirped grating is eliminated by the digitalization technique in Chapter 4th. According to the chirped grating characteristic in chapter 3, the peak reflectivity of 螖 neff=1*10-4 is increased by increasing the refractive index modulation depth to obtain a better recovery effect.
【學(xué)位授予單位】：江南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.11;TN253

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