【摘要】：基于四波混頻(FWM)效應(yīng)的光纖參量放大(FOPA)技術(shù)由于具有大帶寬、低噪聲、對信號的調(diào)制格式和比特率完全透明等顯著特點,一直是光纖放大技術(shù)研究的熱點之一。本論文圍繞偏振不敏感光纖參量放大器展開研究,詳細地研究了偏振不敏感光纖參量放大器對偏振復(fù)用信號的放大特性。主要研究內(nèi)容如下:1.深入研究了 FOPA的基本理論,簡要概述了 FWM的物理機制,討論了實現(xiàn)相位匹配的方法,并詳細地介紹了 FOPA偏振效應(yīng)的基本理論。2.從正交雙泵浦結(jié)構(gòu)FOPA的矢量耦合波方程組出發(fā),在小信號條件下,推導(dǎo)出了兩個偏振態(tài)方向上信號光的參量增益表達式。采用四階-龍格庫塔算法,數(shù)值仿真了小信號條件下的參量增益特性,結(jié)果表明小信號模型下參量增益與輸入信號光偏振態(tài)的無關(guān)性,并數(shù)值模擬了考慮泵浦損耗時的參量增益曲線,詳細地分析了泵浦光功率、光纖非線性系數(shù)和光纖長度對參量增益的影響。在實際應(yīng)用中可以選擇合適的參數(shù),使得FOPA工作在較好狀態(tài)。3.研究了偏振不敏感FOPA對偏振復(fù)用信號的放大特性。采用對稱分步傅里葉算法,數(shù)值計算了兩路偏振復(fù)用信號在FOPA的放大特性,結(jié)果顯示兩路偏振復(fù)用信號具有相同的參量增益。并且詳細地研究了不同調(diào)制格式(NRZ-OOK調(diào)制、DPSK調(diào)制、QPSK調(diào)制)和不同信號功率的兩路偏振復(fù)用信號的增益特性,結(jié)果表明在小信號模型下偏振不敏感FOPA可以實現(xiàn)對偏振復(fù)用信號調(diào)制格式完全透明的放大。
[Abstract]:Fiber Optic Parametric Amplification (FOPA) technology based on four-wave mixing (FWM) (FWM) effect has been one of the hotspots in optical fiber amplifying technology due to its advantages of large bandwidth, low noise, complete transparency of modulation format and bit rate, and so on. In this paper, the polarization insensitive fiber parametric amplifiers (PPAs) are studied in detail. The main research contents are as follows: 1. The basic theory of FOPA is deeply studied, the physical mechanism of FWM is briefly summarized, the method of phase matching is discussed, and the basic theory of polarization effect of FOPA is introduced in detail. Based on the vector coupled wave equations of FOPA with orthogonal double pump structure, the parametric gain expression of the signal light in two polarized states is derived under the condition of small signal. By using the fourth-order Runge-Kutta algorithm, the parametric gain characteristics under small signal conditions are numerically simulated. The results show that the parametric gain is independent of the polarization state of the input signal under the small-signal model. The parametric gain curve considering pump loss is numerically simulated, and the effects of pump power, fiber nonlinear coefficient and fiber length on parametric gain are analyzed in detail. In practical application, the appropriate parameters can be selected to make the FOPA work in a better state. 3. The amplification characteristics of polarization multiplexed signals by polarization insensitive FOPA are studied. The amplification characteristics of two polarization multiplexing signals in FOPA are numerically calculated by using the symmetric discrete step Fourier algorithm. The results show that the two polarization multiplexing signals have the same parametric gain. The gain characteristics of different modulation formats (NRZ-OOK modulation / DPSK modulation / QPSK modulation) and two polarization multiplexing signals with different signal power are studied in detail. The results show that polarization-insensitive FOPA can amplify the modulation format of polarization multiplexed signals completely transparently under the small signal model.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN722

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本文編號：2190035