【摘要】：隨著云計(jì)算、物聯(lián)網(wǎng)以及高清晰度電視等寬帶綜合業(yè)務(wù)的出現(xiàn)和推廣，對(duì)通信速率和穩(wěn)定性也提出了更高的要求，以DWDM為基礎(chǔ)的全光網(wǎng)絡(luò)，，避免了光電轉(zhuǎn)換代價(jià)，突破了電子瓶頸的限制，是解決高速傳輸業(yè)務(wù)發(fā)展的最佳方案。實(shí)現(xiàn)DWDM全光網(wǎng)絡(luò)無(wú)瓶頸的高速傳輸，這就要求各分立器件是具有高速集成的全光器件，由此，光纖光柵以不可比擬的優(yōu)勢(shì)，受到通信界的廣泛關(guān)注和深入研究。 近幾年得到迅速發(fā)展的光纖光柵是一種新型光纖無(wú)源器件，因其易于與光纖通信系統(tǒng)兼容實(shí)現(xiàn)全光纖化的優(yōu)點(diǎn)，被廣泛應(yīng)用于可調(diào)諧濾波器中作為波長(zhǎng)選擇和調(diào)諧元件�；诠饫w布拉格光柵的法布里-珀羅(FBG-FP)結(jié)構(gòu)型器件更是表現(xiàn)出了極大的優(yōu)勢(shì)，不少研究報(bào)道了將FBG-FP濾波器作為選模元件用于光纖激光器中實(shí)現(xiàn)單縱模激光輸出。 在全光通信中，對(duì)動(dòng)態(tài)密集波分復(fù)用網(wǎng)絡(luò)進(jìn)行靈活控制管理的關(guān)鍵設(shè)備是可重構(gòu)光分插復(fù)用器(ROADM)，它不僅可以有選擇地對(duì)需要的光波長(zhǎng)進(jìn)行上下載，還可以通過(guò)調(diào)節(jié)輸入光功率，使輸出光信號(hào)達(dá)到動(dòng)態(tài)增益均衡，從而實(shí)現(xiàn)密集波分復(fù)用信道的分插功能。 本文根據(jù)DWDM系統(tǒng)對(duì)光纖可調(diào)諧濾波器的具體技術(shù)要求，深入分析和模擬研究了基于光纖布拉格光柵的可調(diào)諧窄帶濾波器及其在DWDM系統(tǒng)中的應(yīng)用。主要研究工作包括： (1)提出了一種基于多個(gè)FBG的全光纖型FP腔結(jié)構(gòu)濾波器，目的在于改善單腔結(jié)構(gòu)的濾波效果，通過(guò)對(duì)多腔FBG-FP結(jié)構(gòu)透射特性進(jìn)行詳細(xì)的理論分析與數(shù)值仿真，得出結(jié)論：只要組成光柵的反射率提高，就可以增強(qiáng)諧振峰過(guò)渡帶的滾降特性，當(dāng)用于不同應(yīng)用時(shí)，通過(guò)調(diào)節(jié)腔長(zhǎng)可以得到所需的透射諧振峰線寬。與單個(gè)FBG-FP相比，多個(gè)光柵組成的FP腔具有更好的濾波特性。 (2)本文采用OptiSystem光通信軟件對(duì)FBG-FP腔型可調(diào)諧濾波器在可調(diào)諧光纖激光器中的應(yīng)用進(jìn)行了分析與研究。結(jié)果表明，采用上述光纖Bragg光柵組合型可調(diào)諧濾波器可以實(shí)現(xiàn)光纖激光器單縱模激光的輸出。 (3)設(shè)計(jì)了一種基于FBG-FP腔可調(diào)諧濾波器的新型ROADM，與以往FP型ROADM不同的是，該器件的輸入端和下載端在同一側(cè)，上載端和輸出端口在另外一側(cè)。經(jīng)仿真分析研究，該器件的光功率損耗約為1dB，且各信道可達(dá)到動(dòng)態(tài)增益均衡。 (4)針對(duì)光器件的特性，利用OptiSystem光通訊仿真軟件對(duì)引入該ROADM的DWDM系統(tǒng)進(jìn)行仿真，對(duì)整個(gè)系統(tǒng)的光學(xué)性能指標(biāo)和功能特性進(jìn)行測(cè)試和分析。對(duì)眼圖和誤碼率的測(cè)試分析表明此種結(jié)構(gòu)的ROADM符合設(shè)計(jì)標(biāo)準(zhǔn)，其應(yīng)用對(duì)DWDM系統(tǒng)的影響不大，由此構(gòu)成的DWDM系統(tǒng)功能達(dá)到設(shè)計(jì)要求，能夠充分滿足全光網(wǎng)絡(luò)的需求。
[Abstract]:With the emergence and promotion of broadband integrated services such as cloud computing, Internet of things and HDTV, higher requirements for communication speed and stability have been put forward. The all-optical network based on DWDM avoids the cost of optoelectronic conversion. Breaking through the limitation of electronic bottleneck, it is the best scheme to solve the development of high-speed transmission service. To realize the high-speed transmission of DWDM all-optical network without bottleneck, it is required that the discrete devices are all-optical devices with high speed integration. Therefore, fiber Bragg gratings (FBG) have been widely concerned and deeply studied by the communication field because of their incomparable advantages. Fiber Bragg grating (FBG), which has been developed rapidly in recent years, is a new type of fiber passive device, which is widely used as wavelength selection and tuning element in tunable filters because of its advantages of being compatible with optical fiber communication systems to realize all-optical fiber conversion. Fabry-Perot (FBG-FP) structural devices based on fiber Bragg gratings (FBG) have shown great advantages. Many studies have reported that FBG-FP filters are used as mode selection elements to realize single longitudinal mode laser output in fiber lasers. In all optical communication, the key device for flexible control and management of dynamic dense wavelength division multiplexing network is the reconfigurable optical add / drop multiplexer (ROADM), which can not only selectively download the required wavelength, The dynamic gain equalization of the output optical signal can also be achieved by adjusting the input optical power, so as to realize the demultiplexing function of the dense wavelength division multiplexing (DWDM) channel. According to the technical requirements of fiber tunable filter in DWDM system, the tunable narrowband filter based on fiber Bragg grating and its application in DWDM system are analyzed and simulated in this paper. The main research works are as follows: (1) an all-fiber FP cavity filter based on multiple FBG is proposed, which aims to improve the filtering effect of single-cavity structure. Through the detailed theoretical analysis and numerical simulation of the transmission characteristics of multi-cavity FBG-FP structures, it is concluded that, as long as the reflectivity of the grating is increased, the rolling and dropping characteristics of the transition band of the resonant peak can be enhanced, and when used in different applications, By adjusting the cavity length, the required linewidth of the transmission resonance peak can be obtained. Compared with a single FBG-FP, the FP cavity composed of multiple gratings has better filtering performance. (2) the application of FBG-FP cavity tunable filter in tunable fiber laser is analyzed and studied by OptiSystem optical communication software. The results show that the single longitudinal mode laser output of fiber laser can be realized by using the fiber Bragg grating combined tunable filter. (3) A novel ROADM, based on FBG-FP cavity tunable filter is designed, which is different from FP type ROADM. The input end and download end of the device are on the same side, and the upload end and output port are on the other side. The simulation results show that the optical power loss of the device is about 1 dB and the dynamic gain equalization can be achieved in each channel. (4) according to the characteristics of optical devices, the OptiSystem optical communication simulation software is used to simulate the DWDM system introduced into the ROADM, and the optical performance and functional characteristics of the whole system are tested and analyzed. The test results of eye diagram and bit error rate show that the ROADM of this structure conforms to the design standard, and its application has little influence on DWDM system. The function of the resulting DWDM system can meet the design requirements and can fully meet the requirements of all-optical network.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN713;TN929.1

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