本文選題：保護(hù)倒換 + 故障定位��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：隨著互聯(lián)網(wǎng)流量的爆炸式增長和光纖通道的傳輸速率不斷提高,一旦網(wǎng)絡(luò)出現(xiàn)故障,將會導(dǎo)致大量數(shù)據(jù)丟失和服務(wù)傳輸中斷,為了使流量數(shù)據(jù)能夠盡快避開故障鏈路傳輸?shù)狡渌】档逆溌坊蚬?jié)點(diǎn),提高光網(wǎng)絡(luò)生存性,完善的故障監(jiān)測定位和保護(hù)切換機(jī)制是非常重要的。論文針對目前光網(wǎng)絡(luò)的生存性需求,提出了一種LR-PON的高效全保護(hù)機(jī)制。通過收集監(jiān)控信息定位故障段后,NMS將通過切換光開關(guān)調(diào)控保護(hù)機(jī)制。論文所提出的保護(hù)方案可以保護(hù)LR-PON幾乎所有光纖故障:環(huán)上的單光纖故障,光纖環(huán)上不同段中的多光纖故障,光纖環(huán)上同一段中的雙光纖故障,從RN到PSC的光纖鏈路故障,以及從PSC到ONU的光纖鏈路故障。通過理論分析和仿真結(jié)果可知,論文提出的保護(hù)機(jī)制具有低成本,低損耗特點(diǎn),同時網(wǎng)絡(luò)具有高達(dá)99.9992%的高可靠性。此外,所提出的系統(tǒng)在正常工作模式和保護(hù)模式中的BER都可以滿足系統(tǒng)的要求。為了使LR-PON生存性機(jī)制更加穩(wěn)定可靠,系統(tǒng)應(yīng)當(dāng)可以實(shí)時地監(jiān)測整個網(wǎng)絡(luò)中的所有光纖鏈路和器件,并且應(yīng)當(dāng)盡可能快速精確地確定故障位置。為此,我們提出了一種高可靠性的快速精確故障檢測及定位機(jī)制,通過光編碼方案來監(jiān)視全網(wǎng)所有的光纖鏈路和網(wǎng)絡(luò)節(jié)點(diǎn)狀態(tài),并通過OTDR設(shè)備和可調(diào)諧開關(guān)精確定位故障的具體位置。在故障檢測定位的同時,系統(tǒng)可以通過保護(hù)倒換抵御LR-PON(包括環(huán)形網(wǎng)絡(luò)和樹形網(wǎng)絡(luò))免受各種故障。論文分析了系統(tǒng)的恢復(fù)時間,損耗,成本,誤碼率等方面的性能,結(jié)果表明我們設(shè)計的LR-PON故障檢測和定位方案具有成本和損耗的綜合最佳結(jié)果。為了升級現(xiàn)有的有限覆蓋范圍和非彈性網(wǎng)絡(luò)PON系統(tǒng),論文提出了一種新型的SD-LR-PON系統(tǒng),用于長距離城域接入網(wǎng)場景,并研究設(shè)計了彈性系統(tǒng)的關(guān)鍵器件全波段多模干涉型波分復(fù)用器,利用成對干涉和邊入射成像機(jī)理,建立波導(dǎo)激發(fā)干涉區(qū)內(nèi)導(dǎo)模的數(shù)學(xué)模型,結(jié)合輸入輸出波導(dǎo)對器件的影響,推導(dǎo)出了多模干涉器件的行為模式公式,從而確定了器件的參數(shù),并分別用基于鈮酸鋰薄膜和二氧化硅波導(dǎo)完成了全波段解復(fù)用器的設(shè)計。此外,針對彈性光網(wǎng)絡(luò)中頻譜資源分布特點(diǎn),論文建立了基于時域、波長域和子載波域的三維資源評價模型,并基于彈性度和頻譜碎片度的分析建立了頻譜效用函數(shù)。利用此函數(shù),論文提出了改進(jìn)的動態(tài)帶寬分配算法,有效地降低了網(wǎng)絡(luò)的資源碎片,提高了系統(tǒng)傳輸效率。
[Abstract]:With the explosive growth of Internet traffic and the increasing transmission rate of fiber channel, once the network fails, it will lead to a lot of data loss and service interruption. It is very important to improve the survivability of optical network in order to avoid the fault link and transmit the traffic data to other healthy links or nodes as soon as possible. It is very important to improve the fault monitoring location and protection switching mechanism. Aiming at the survivability of optical networks, an efficient full protection mechanism of LR-PON is proposed in this paper. After collecting monitoring information to locate the fault section, NMS will switch the optical switch to regulate the protection mechanism. The protection scheme proposed in this paper can protect almost all optical fiber faults in LR-PON: single fiber fault on the ring, multi-fiber fault in different segments of the fiber ring, double fiber fault in the same section of the fiber ring, and fiber link fault from RN to PSC. And fiber link failure from PSC to ONU. The theoretical analysis and simulation results show that the proposed protection mechanism has the characteristics of low cost and low loss, and the network has a high reliability of 99.9992%. In addition, the BER of the proposed system in the normal mode and the protection mode can meet the requirements of the system. In order to make the LR-PON survivability mechanism more stable and reliable, the system should be able to monitor all optical fiber links and devices in the whole network in real time, and the fault location should be determined as quickly and accurately as possible. For this reason, we propose a fast and accurate fault detection and location mechanism with high reliability. The optical coding scheme is used to monitor the state of all optical links and network nodes in the whole network. And through the OTDR equipment and tunable switch to locate the exact location of the fault. At the same time, the system can protect the LR-PON (including ring network and tree network) from all kinds of faults. In this paper, the recovery time, loss, cost and bit error rate of the system are analyzed. The results show that the proposed LR-PON fault detection and location scheme has the best result of cost and loss. In order to upgrade the existing limited coverage and inelastic network PON systems, a new SD-LR-PON system is proposed, which can be used in long distance metro access network scenarios. The all-band multimode interference wavelength division multiplexer of elastic system is studied and designed. By using the imaging mechanism of pairwise interference and edge incidence, the mathematical model of waveguide excitation guided mode in the interference region is established, and the influence of input and output waveguide on the device is also studied. The behavior mode formula of the multimode interference device is derived, and the parameters of the device are determined, and the design of the all-band demultiplexer based on lithium niobate thin film and silica waveguide is completed respectively. In addition, according to the characteristics of spectrum resource distribution in elastic optical networks, a three-dimensional resource evaluation model based on time domain, wavelength domain and subcarrier domain is established, and the spectrum utility function is established based on the analysis of elasticity and spectrum fragmentation. Using this function, an improved dynamic bandwidth allocation algorithm is proposed, which can effectively reduce the resource fragmentation of the network and improve the transmission efficiency of the system.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

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