本文選題：碼型轉換 + 信號再生�。� 參考：《華中科技大學》2014年博士論文

【摘要】：隨著人們對信息需求的快速增長,現(xiàn)代光傳輸網(wǎng)絡正朝著超高速、超大容量和超長距離傳輸?shù)姆较虬l(fā)展。新型調制格式信號由于具有高頻譜效率和較強的色散和非線性抗性,已經被廣泛應用在傳輸網(wǎng)絡中來進一步提高單個信道信號的比特速率和傳輸距離。各種復用技術也已經被廣泛應用在傳輸網(wǎng)絡中來進一步地提高信道數(shù),從而增大傳輸容量。另一方面,為了確保每個網(wǎng)絡中能夠長距離地傳輸最合適的碼型信號,網(wǎng)絡節(jié)點必須具備全光碼型轉換和信號再生的功能。所以,各種復用方式的新型調制格式信號的全光并行碼型轉換和再生的研究對于光通信網(wǎng)絡的意義重大。 本論文在國家973計劃和國家自然科學基金項目的資助下,理論模擬研究了波分復用(WDM)信號以及偏振復用(PDM)信號在半導體光放大器(SOA)中并行信號處理時引入的串擾情況,并分析了減小并行信號處理過程中引入的串擾的方法。在此基礎上利用SOA中的交叉相位調制(XPM)效應和增益飽和效應實現(xiàn)了WDM和PDM的新型調制格式信號的全光并行低串擾碼型轉換和信號再生。概括全文,主要研究成果和學術貢獻有如下幾個方面： (1)總結了偏振光的基本理論知識和幾種描述光偏振態(tài)的方法,歸納了偏振復用和解復用的方法。在此基礎上分析了偏振復用信號解復用時的串擾情況,為后面說明PDM信號并行處理過程中的串擾問題打下基礎。詳細分析了兩種相位調制格式信號的調制產生和解調的方法,并比較說明了不同信號的特點。分析了SOA中的多種非線性效應。 (2)利用量子阱SOA模型模擬了不同情況下非歸零(NRZ)到歸零(RZ)信號碼型轉換的效果和串擾情況,解釋了轉換過程中減小串擾的機理和方法,用實驗實現(xiàn)了的低串擾的多信道NRZ開關鍵控(OOK)到RZ-OOK信號以及多信道NRZ正交相移鍵控(QPSK)到RZ-QPSK信號的并行碼型轉換。從理論上解釋了多信道RZ-QPSK到NRZ-QPSK信號碼型轉換的原理,并模擬了不同占空比的多信道RZ-QPSK到NRZ-QPSK信號轉換的過程,分析了窄帶濾波器對轉換后信號幅度抖動的影響,最后用實驗實現(xiàn)了多信道RZ-QPSK信號到NRZ-QPSK信號的并行碼型轉換。 (3)利用SOA模型模擬了信號經過SOA后經緯度的變化,直觀地說明了SOA中的偏振旋轉效應。分析了兩個偏振態(tài)正交的信號在不同的泵浦光功率下通過不同偏振相關增益的SOA后的偏振正交性的變化情況,從模擬結果中得出減小偏振態(tài)正交性變化量的方法,歸納出了減小PDM信號并行處理過程中引入的串擾的方法,并用實驗驗證了模擬的結果。在此基礎上,利用單個SOA和延時干涉儀(DI)實現(xiàn)了總速率為800Gb/s的WDM-PDM-NRZ-QPSK信號到WDM-PDM-RZ-QPSK信號的全光并行低串擾的碼型轉換。 (4)利用SOA中的增益飽和效應實現(xiàn)了偏振復用的RZ二進制相移鍵控(BPSK)信號的并行幅度再生,通過優(yōu)化信號的入射偏振態(tài)減小了并行幅度再生過程中引入的信道間串擾,并研究了幅度再生過程中減小自相位調制(SPM)效應引入相位噪聲的方法。接著利用兩個串聯(lián)的SOA和DI實現(xiàn)了NRZ-BPSK信號的幅度再生。 (5)利用SOA中的XPM效應,實現(xiàn)了NRZ-OOK信號到NRZ-BPSK信號的碼型轉換。利用檢偏器對信號偏振態(tài)的處理減小了轉換過程中交叉增益調制(XGM)效應引入的幅度抖動,得到了幅度均衡的NRZ-BPSK信號。在碼型轉換的過程中,同時還實現(xiàn)了高消光比的波長轉換功能。
[Abstract]:With the rapid growth of information demand, modern optical transmission network is developing towards ultra high speed, super large capacity and ultra long distance transmission. The new modulation signal has been widely used in transmission network to further improve single channel signal because of its high frequency spectrum efficiency and strong dispersion and nonlinear resistance. Bit rate and transmission distance. Various multiplexing techniques have also been widely used in transmission networks to further increase the number of channels, thereby increasing the transmission capacity. On the other hand, in order to ensure that the most suitable code type signals can be transmitted for a long distance in each network, the network node must have the function of all optical code conversion and signal regeneration. Therefore, the research of all-optical parallel code conversion and regeneration of various modulation formats of multiplexed signals is of great significance to optical communication networks.
Under the support of the national 973 Plan and the National Natural Science Foundation, this thesis studies the crosstalk situation introduced in the parallel signal processing of the wavelength division multiplexing (WDM) signal and the polarization multiplexing (PDM) signal in the semiconductor optical amplifier (SOA), and analyzes the method of reducing the crosstalk introduced in the process of parallel signal processing. On the basis of the cross phase modulation (XPM) effect and gain saturation effect in SOA, all optical parallel low crosstalk code conversion and signal regeneration of the new modulation format signals of WDM and PDM are realized. The main research results and academic contributions are summarized as follows:
(1) the basic theoretical knowledge of polarized light and several methods describing polarization state are summarized, and polarization multiplexing and reusing methods are summed up. On this basis, the crosstalk situation of polarization multiplexing signals in demultiplexing is analyzed, and the crosstalk problem in the parallel processing of PDM signals is explained. Two phase modulation is analyzed in detail. The modulation generation and demodulation methods of format signals are compared, and the characteristics of different signals are compared. Several nonlinear effects in SOA are analyzed.
(2) using the quantum well SOA model to simulate the effect and crosstalk of non return zero (NRZ) to zero (RZ) signal conversion in different cases, the mechanism and method of reducing crosstalk in the process of conversion are explained, and the low crosstalk of multichannel NRZ switch keying (OOK) to RZ-OOK signal and multichannel NRZ quadrature phase shift keying (QPSK) to R in the process of experiment are realized. The parallel code conversion of Z-QPSK signals is used to explain the principle of multichannel RZ-QPSK to NRZ-QPSK signal conversion in theory, and the process of multichannel RZ-QPSK to NRZ-QPSK signal conversion with different duty ratio is simulated, and the effect of the narrowband filter on the amplitude jitter of the signal after the conversion is analyzed. Finally, the multichannel RZ-QPSK signal is realized by experiment. The parallel code conversion to the NRZ-QPSK signal.
(3) using the SOA model to simulate the change of the latitude and longitude after the signal after SOA, the polarization rotation effect in SOA is clearly illustrated. The polarization orthogonality of the two orthogonal signals with different polarization correlation gain under different pump light power is analyzed, and the reduction of polarization state is obtained from the simulation results. In the method of sexual variation, the method of reducing the crosstalk introduced in the parallel processing of PDM signals is summed up and the results of the simulation are verified by experiments. On this basis, a single SOA and delay interferometer (DI) is used to realize the code conversion of all optical parallel low crosstalk of the WDM-PDM-NRZ-QPSK signal with a total rate of 800Gb/s to the WDM-PDM-RZ-QPSK signal. Change.
(4) using the gain saturation effect in SOA, the parallel amplitude regeneration of the polarization multiplexed RZ binary phase shift keying (BPSK) signal is realized. By optimizing the incident polarization of the signal, the inter channel crosstalk introduced in the process of parallel amplitude regeneration is reduced, and the phase noise reduction by reducing the self phase modulation (SPM) effect in the amplitude regeneration process is studied. Then the amplitude regeneration of NRZ-BPSK signal is realized by using two series of SOA and DI.
(5) using the XPM effect in SOA, the code conversion of the NRZ-OOK signal to the NRZ-BPSK signal is realized. The amplitude jitter introduced by the cross gain modulation (XGM) effect in the conversion process is reduced by the detection of the polarization state of the signal, and the amplitude equalizable NRZ-BPSK signal is obtained. The high extinction ratio is also realized in the process of code conversion. The wavelength conversion function.
【學位授予單位】：華中科技大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN929.1

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相關期刊論文 前1條

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本文編號：1967071