【摘要】：隨著用戶對(duì)帶寬接入需求的不斷增長(zhǎng),光接入網(wǎng)步入了快速發(fā)展的階段。接入網(wǎng)正向著更高速率、更長(zhǎng)距離、帶寬分配更靈活、業(yè)務(wù)類型更多樣化的方向發(fā)展。以正交頻分復(fù)用無(wú)源光網(wǎng)絡(luò)(OFDM-PON)為代表的新型接入網(wǎng)技術(shù)引起越來(lái)越多的關(guān)注。OFDM-PON擁有較強(qiáng)的抗色散能力,頻譜效率更高,帶寬分配更靈活,擴(kuò)展性和兼容性更強(qiáng)等優(yōu)點(diǎn),因此具有重要的研究?jī)r(jià)值。然而,OFDM-PON仍存在一些關(guān)鍵問(wèn)題有待解決。例如：光OFDM信號(hào)發(fā)送與接收技術(shù)相對(duì)復(fù)雜因而成本較高；OFDM信號(hào)存在較大的峰均功率比(PAPR),直接調(diào)制激光器(DML)的調(diào)制效率較低；接入帶寬的進(jìn)一步提高受到數(shù)模轉(zhuǎn)換模塊(DAC/ADC)的采樣率限制；時(shí)頻域的帶寬資源二維動(dòng)態(tài)帶寬分配(DBA)方案尚不完善,等等。 圍繞上述技術(shù)難題,論文對(duì)OFDM-PON中上行調(diào)制、直接檢測(cè)(DD)下的偏振復(fù)用(PDM).時(shí)域與頻域的帶寬資源二維DBA等技術(shù)方案展開(kāi)了研究。論文的主要研究工作和創(chuàng)新點(diǎn)如下： 1).為了提高OFDM-波分復(fù)用(WDM)-PON的波長(zhǎng)自適應(yīng)能力,設(shè)計(jì)了一種反射型半導(dǎo)體激光放大器(RSOA)與OFDM調(diào)制相結(jié)合的無(wú)色ONU方案。仿真結(jié)果表明,在傳輸距離為40km,誤碼率(BER)小于等于10-6量級(jí)時(shí),基于RSOA的無(wú)色ONU上行帶寬可從2.5Gbit/s提高到10Gbit/s。 2). OFDM信號(hào)具有較高的PAPR,要求激光器線性區(qū)間較大,且ONU的總能耗占接入網(wǎng)能耗的比重較大。因此,提高調(diào)制效率和降低激光器的能耗是OFDM-PON的重要問(wèn)題。針對(duì)上述問(wèn)題,提出了一種將非對(duì)稱截?cái)喙庹活l分復(fù)用(ACO-OFDM)與ONU激光器無(wú)數(shù)據(jù)關(guān)閉機(jī)制相結(jié)合的上行節(jié)能調(diào)制方案。該方案具有以下兩個(gè)特點(diǎn)：(1)利用偏置在閾值點(diǎn)的DML在光域產(chǎn)生ACO-OFDM信號(hào),降低了電路實(shí)現(xiàn)信號(hào)的難度與成本；(2)無(wú)上行數(shù)據(jù)時(shí),激光器處于關(guān)閉狀態(tài),降低激光器能耗。仿真結(jié)果表明,與傳統(tǒng)OFDM-PON調(diào)制方式相比,該方案可降低激光器發(fā)射功率,增大調(diào)制深度。在傳輸距離為20kmm,傳輸速率為10Gbit/s, BER為3.8×10-3(前向編碼糾錯(cuò)FEC門限值)時(shí),可節(jié)省發(fā)送功率約4.3dB。 3).針對(duì)OFDM-PON接入帶寬受限于DAC/ADC采樣率,提出了一種雙邊帶(DSB)-PDM-DD-OFDM-PON無(wú)保護(hù)間隔下行調(diào)制方案。仿真結(jié)果表明,該方案無(wú)需信號(hào)與載波的保護(hù)間隔,在調(diào)制格式為16Q AM的情況下,下行鏈路僅用采樣率為10GSa/s的DAC/ADC,即可使接入帶寬到達(dá)40Gbit/s量級(jí),輔以數(shù)字信道均衡后,在傳輸距離為20km時(shí),BER小于3.8×10-3(FEC門限值)。 4).為了提高OFDM-PON帶寬利用率,提出了一種基于業(yè)務(wù)流水線輪詢(SPP)的時(shí)頻域二維DBA算法。該算法解決了將TDM-PON算法直接搬用到OFDM-PON造成的資源分配粒度較大、存在信道空閑時(shí)間等問(wèn)題。仿真結(jié)果表明,與OFDM-PON現(xiàn)有的順序動(dòng)態(tài)子載波分配(SDSCA)算法和自適應(yīng)周期性間插輪詢(IPACT) DBA相比,該算法可減小帶寬碎片和時(shí)延,在滿負(fù)載無(wú)丟包下,提高帶寬利用率5%和7%。
[Abstract]:With the increasing demand for bandwidth access, optical access network has entered the stage of rapid development. Access networks are moving towards higher rates, longer distances, more flexible bandwidth allocation, and more diversified service types. New access network technology, represented by orthogonal Frequency Division Multiplexing (OFDM-PON) passive Optical Network (OFDM-PON), has attracted more and more attention. OFDM-PON has strong anti-dispersion capability, higher spectral efficiency and more flexible bandwidth allocation. The expansibility and compatibility are stronger and so on, so it has important research value. However, there are still some key problems to be solved in OFDM-PON. For example, the technology of transmitting and receiving optical OFDM signal is relatively complex and the cost is high, the modulation efficiency of (PAPR), direct modulation laser (DML) is lower than that of (PAPR), direct modulation laser because of the large peak-to-average power of OFDM signal. The further improvement of access bandwidth is limited by the sampling rate of digital-to-analog conversion module (DAC/ADC), and the two-dimensional dynamic bandwidth allocation (DBA) scheme in time-frequency domain is not perfect, and so on. According to the above technical difficulties, this paper directly detects the polarization multiplexing (PDM). In OFDM-PON by uplink modulation. Two-dimensional DBA of bandwidth resources in time domain and frequency domain are studied. The main research work and innovation are as follows: 1). In order to improve the wavelength adaptation of OFDM- wavelength division multiplexing (WDM) PON, a colorless ONU scheme combining (RSOA) with OFDM modulation is designed. Simulation results show that the uplink bandwidth of colorless ONU based on RSOA can be increased from 2.5Gbit/s to 10Gbit / s when the transmission distance is 40km and the bit error rate (BER) is less than 10-6. 2) The high PAPR, of OFDM signals requires a large linear range of lasers, and the total energy consumption of ONU accounts for a large proportion of the access network energy consumption. Therefore, improving modulation efficiency and reducing laser energy consumption are important problems in OFDM-PON. In order to solve the above problems, an uplink energy saving modulation scheme combining asymmetric truncated optical orthogonal frequency division multiplexing (ACO-OFDM) with a data-free switching mechanism for ONU lasers is proposed. The scheme has the following two characteristics: (1) the ACO-OFDM signal is generated in the optical domain by using the biased DML at the threshold point, which reduces the difficulty and the cost of realizing the signal in the circuit; (2) when there is no uplink data, the laser is closed and the energy consumption is reduced. The simulation results show that the scheme can reduce the laser power and increase the modulation depth compared with the traditional OFDM-PON modulation method. When the transmission distance is 20 kmm, the transmission rate is 10 Gbit / s and the BER is 3.8 脳 10 ~ (-3) (forward coding error correction FEC threshold), the transmission power can be saved about 4.3 dB. 3) Considering that the bandwidth of OFDM-PON access is limited by the sampling rate of DAC/ADC, an unprotected downlink modulation scheme with (DSB)-PDM-DD-OFDM-PON is proposed. The simulation results show that the scheme does not need the protection interval between signal and carrier. In the case of 16Q AM modulation format, the access bandwidth can reach the 40Gbit/s level in the downlink only by DAC/ADC, with a sampling rate of 10GSa/s. After digital channel equalization, when the transmission distance is 20km, the BER is less than 3.8 脳 10-3 (FEC threshold). 4) In order to improve the bandwidth utilization of OFDM-PON, a two-dimensional DBA algorithm in time and frequency domain based on traffic pipeline polling (SPP) is proposed. The algorithm solves the problem of large granularity of resource allocation and channel idle time caused by TDM-PON algorithm moving directly to OFDM-PON. The simulation results show that compared with the existing sequential dynamic subcarrier allocation (SDSCA) algorithm of OFDM-PON and adaptive periodic interleaved polling (IPACT) DBA), the proposed algorithm can reduce bandwidth fragmentation and delay without packet dropping. Increase bandwidth utilization by 5% and 7%.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1

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