【摘要】：光纖通信技術(shù)是現(xiàn)今通信行業(yè)甚至整個(gè)信息產(chǎn)業(yè)的熱門技術(shù)之一。同時(shí),也是通信技術(shù)未來發(fā)展的主要方向。為了能夠適應(yīng)現(xiàn)代通信技術(shù)向著高速率、大容量、低損耗的方向發(fā)展,光纖通信在商業(yè)、軍事等領(lǐng)域都有著極高的地位和發(fā)展空間。模擬傳輸信號,在光纖中的傳輸充分利用了其低損耗,高傳輸速率的優(yōu)勢,引起了廣泛的研究。因此,實(shí)現(xiàn)模擬信號的高線性度、低損耗傳輸是光纖傳輸系統(tǒng)中的關(guān)鍵技術(shù)之一。由于模擬信號在光纖傳輸中受到非線性損耗的影響較大,現(xiàn)有的方法中主要有兩種方法用于減小其對系統(tǒng)性能的影響：一是簡單地通過增加光學(xué)器件、改變傳輸系統(tǒng)自身結(jié)構(gòu)來降低非線性損耗,但是這種方法只能在一定程度上降低非線性效應(yīng),未能提高信號增益；二是在光電相位調(diào)制的基礎(chǔ)上,應(yīng)用負(fù)反饋調(diào)節(jié)機(jī)制提高系統(tǒng)線性化程度。由于該方法是基于相位調(diào)制的傳輸方法,傳輸系統(tǒng)受相位影響很大,從而造成系統(tǒng)的不穩(wěn)定。因此,為了克服這些缺陷,本論文圍繞高線性、低損耗的光纖通信方法展開深入的分析。首先,系統(tǒng)的分析和總結(jié)了現(xiàn)有模擬信號光電通信技術(shù)的技術(shù)背景、調(diào)制和解調(diào)技術(shù)的基本概念、系統(tǒng)框架,以及光電傳輸技術(shù)的特點(diǎn)�；诂F(xiàn)有的調(diào)制和解調(diào)方法：論文研究了一種調(diào)制器低偏置角度的光電傳輸方法。在傳統(tǒng)強(qiáng)度調(diào)制的基礎(chǔ)上,對調(diào)制器的最佳偏置角度進(jìn)行推導(dǎo)和驗(yàn)證。推導(dǎo)得到的最佳偏置角度能夠使得系統(tǒng)非線性程度最低,即：調(diào)制器工作在所推導(dǎo)的最佳偏置角度時(shí),系統(tǒng)的動態(tài)雜散范圍(SFDR, Spurious Free Dynamic Range)的數(shù)值達(dá)到最大,同時(shí)噪聲指數(shù)(NF, Noise Figure)最小。相比傳統(tǒng)正交偏置的強(qiáng)度調(diào)制而言,系統(tǒng)性能得到最大優(yōu)化。同時(shí),該方案給出了確保系統(tǒng)有效性的條件,即相對強(qiáng)度噪聲(RIN, Relative Intensity Noise)必須大于17倍的傳輸激光器熱噪聲(Thermal Noise)。此外,論文針對基于相位調(diào)制的相干解調(diào)技術(shù)進(jìn)行了深入的研究。針對該傳輸系統(tǒng),進(jìn)行了時(shí)域和頻域的分析,推導(dǎo)得到了信號項(xiàng)和三階互交調(diào)項(xiàng)的解析表達(dá)式,并通過數(shù)值仿真驗(yàn)證了其正確性。最后,在此基礎(chǔ)上,論文首次提出了一種基于強(qiáng)度調(diào)制和負(fù)反饋解調(diào)的光纖通信方法。該方法在發(fā)送端,使用強(qiáng)度調(diào)制方式對載波光信號進(jìn)行調(diào)制,而在接收端,使用光-電探測器實(shí)現(xiàn)對已調(diào)信號的解調(diào),從而有效地解決了傳統(tǒng)相位-相干解調(diào)系統(tǒng)中已調(diào)信號相位受溫度影響較大的問題,即當(dāng)溫度變化較大時(shí),已調(diào)信號的相位受外部環(huán)境影響而改變導(dǎo)致信號不穩(wěn)定。因此在傳統(tǒng)強(qiáng)度調(diào)制的鏈路基礎(chǔ)上增加負(fù)反饋回路減少鏈路受環(huán)境影響的同時(shí)提高了傳輸信號質(zhì)量,此外該方法克服了傳統(tǒng)系統(tǒng)傳輸增益較低的缺陷。論文經(jīng)過一系列的數(shù)學(xué)推導(dǎo),得到了關(guān)于該系統(tǒng)傳輸性能的解析表達(dá)式,并通過與數(shù)值仿真結(jié)果相比較,驗(yàn)證了該解析表達(dá)式的準(zhǔn)確性和該傳輸系統(tǒng)的性能優(yōu)越性。
[Abstract]:Optical fiber communication technology is one of the hot technologies in the communication industry and even the whole information industry. At the same time, it is also the main direction of the future development of communication technology. In order to adapt to the development of high speed, large capacity and low loss in the direction of modern communication technology, fiber communication has a very high status and development in the fields of Commerce, military and other fields. In the optical fiber, the transmission of analog signals makes full use of the advantages of low loss and high transmission rate. Therefore, the realization of high linearity and low loss transmission of analog signals is one of the key technologies in the optical fiber transmission system. The simulation signal is greatly influenced by the nonlinear loss in the optical fiber transmission. In the existing methods, there are two main methods to reduce the effect on the performance of the system. One is to reduce the nonlinear loss by simply increasing the optical device and changing the structure of the transmission system, but this method can only reduce the nonlinear effect to a certain extent, and can not raise the high signal gain; two is in the photoelectric phase modulation. On the basis of this, the negative feedback regulation mechanism is applied to improve the degree of linearization of the system. Because the method is based on the phase modulation transmission method, the transmission system is affected by the phase greatly and thus causes the system instability. Therefore, in order to overcome these defects, this paper focuses on the high linear, low loss fiber communication methods. First, the method of optical fiber communication is analyzed. This paper analyzes and summarizes the technical background of the existing analog signal optical communication technology, the basic concepts of modulation and demodulation technology, the system framework and the characteristics of the photoelectric transmission technology. Based on the existing modulation and demodulation methods, the paper studies a photoelectric transmission method of low bias angle of the modulator. The optimal bias angle of the modulator is derived and verified. The obtained optimal bias angle can make the system minimum nonlinear, that is, the dynamic stray range (SFDR, Spurious Free Dynamic Range) of the system reaches the maximum when the modulator works at the optimal bias angle, and the noise index (NF, No) is at the same time. ISE Figure) is minimal. Compared with the traditional orthogonal bias intensity modulation, the system performance is optimized. At the same time, the scheme gives the condition to ensure the effectiveness of the system, that is, the relative intensity noise (RIN, Relative Intensity Noise) must be greater than 17 times the thermal noise of the transmission laser (Thermal Noise). Furthermore, the thesis is aimed at the phase based modulation. The coherent demodulation technology is deeply studied. The analysis of the time domain and frequency domain is carried out for the transmission system. The analytical expressions of the signal term and the three order cross modulation are derived, and the correctness is verified by the numerical simulation. Finally, on this basis, the paper first proposes a kind of intensity modulation and negative feedback demodulation. The method of optical fiber communication. This method uses the intensity modulation mode to modulate the carrier wave signal at the sending end, and the demodulation of the modulated signal is realized by the light electric detector at the receiving end. Thus, the problem that the phase of the modulated signal in the traditional phase coherent demodulation system is greatly affected by the temperature is effectively solved, that is, when the temperature varies greatly. When the phase of the modulated signal is affected by the external environment, the signal is unstable. Therefore, the negative feedback loop is added to the traditional intensity modulated link to reduce the link affected by the environment and improve the transmission signal quality. In addition, the method overcomes the shortcomings of the traditional system with low transmission gain. The analytical expression of the transmission performance of the system is obtained, and the accuracy of the analytical expression and the performance superiority of the transmission system are verified by comparison with the numerical simulation results.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.1

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