發(fā)布時(shí)間：2018-08-16 11:21

【摘要】：近年來隨著云計(jì)算和大數(shù)據(jù)等業(yè)務(wù)的大規(guī)模發(fā)展,人們對(duì)信息傳輸速率和帶寬的需求日益增加。目前,光纖通信作為一種高速率、大容量且相對(duì)穩(wěn)定的信息傳輸方式,成為了解決這一需求的必由之路。偏振復(fù)用技術(shù)(Polarization Division Multiplexing, PDM)通過利用光波的偏振特性,在同一信道中傳輸兩路同波長(zhǎng)偏振態(tài)相互垂直的信號(hào),能直接提高兩倍的頻譜利用率。目前,PDM技術(shù)已經(jīng)非常成熟地應(yīng)用到長(zhǎng)距離光纖通信系統(tǒng)中。而在短距離光纖傳輸系統(tǒng)中,相較于結(jié)構(gòu)復(fù)雜、成本較高且計(jì)算量大的相干探測(cè)解復(fù)用技術(shù),直接探測(cè)解復(fù)用技術(shù)成本低廉且復(fù)雜度低,更加適合作為該系統(tǒng)的檢測(cè)手段。同時(shí),相對(duì)于Jones矩陣,Stokes空間由于采用了獨(dú)特的三維空間表示方法,可以更加直觀和具體地表示信號(hào)偏振態(tài)(State of Polarization, SOP)及其在傳輸中的變化過程,因此將其與電域的數(shù)字信號(hào)處理技術(shù)(Digital Signal Processor, DSP)相結(jié)合,可以靈活地實(shí)現(xiàn)信號(hào)的偏振解復(fù)用與鏈路損傷補(bǔ)償。本論文以PDM的技術(shù)原理為依據(jù),主要針對(duì)直接探測(cè)短距離光纖傳輸系統(tǒng),采用軟件仿真和實(shí)驗(yàn)驗(yàn)證的方法,研究和驗(yàn)證了Stokes矢量分析算法的可行性。首先,本論文從PDM的基本理論分析出發(fā),介紹了偏振光的定義、分類、描述方式以及幾種常用的偏振器件和PDM的實(shí)現(xiàn)方法,簡(jiǎn)要分析了傳輸過程中色散(Chromatic Dispersion, CD)、隨機(jī)雙折射(Randomly Varying Birefringence)、偏振模色散(Polarization Mode Dispersion, PMD)和偏振相關(guān)損耗(Polarization Dependent Loss,PDL)等對(duì)PDM系統(tǒng)性能的影響。并分別針對(duì)相干探測(cè)和直接探測(cè)簡(jiǎn)要介紹了偏振解復(fù)用的常用辦法,同時(shí)針對(duì)強(qiáng)度調(diào)制直接探測(cè)(Intensity Modulation-Direct Detection, IM/DD)系統(tǒng)提出了一種簡(jiǎn)化的斯托克斯矢量算法,簡(jiǎn)化了偏振解復(fù)用的結(jié)構(gòu),降低了算法復(fù)雜度以及系統(tǒng)的成本。其次,利用VPItransmissionMakerTM光通信仿真平臺(tái),搭建了PDM-IM/DD系統(tǒng)的仿真模型。驗(yàn)證了Stokes空間與簡(jiǎn)化Stokes矢量分析算法的可行性,并得出了兩種算法的偏振解復(fù)用效果基本相同的結(jié)論。同時(shí),分析了色散、偏振模色散(PMD)以及偏振相關(guān)損耗(PDL)對(duì)PDM-IM/DD系統(tǒng)傳輸性能的影響。仿真結(jié)果表明在PDM-IM/DD短距離傳輸系統(tǒng)中PMD和PDL對(duì)系統(tǒng)傳輸性能的影響可以忽略不計(jì)。最后,搭建了20-Gbit/s的單偏振態(tài)OOK信號(hào)傳輸系統(tǒng)與2×10-Gbit/s的PDM-IM/DD傳輸實(shí)驗(yàn)系統(tǒng)。在不同的傳輸距離(背靠背、10-km、25-km)下,兩種系統(tǒng)的傳輸性能進(jìn)行了對(duì)比分析,驗(yàn)證了簡(jiǎn)化Stokes算法在PDM-IM/DD系統(tǒng)中的實(shí)際可行性。實(shí)驗(yàn)結(jié)果表明,誤碼率相同(10-4)的情況下,對(duì)于不同的傳輸距離(背靠背、10-km、25-km)PDM系統(tǒng)與單偏振態(tài)系統(tǒng)相比功率損失代價(jià)僅分別為0.3-dB、0.2-dB、0.2-dB,且PDM系統(tǒng)在誤碼率相同(10-4)的情況下,對(duì)比本身背靠背的情況,傳輸10-km與25-km之后功率損失代價(jià)僅分別為1-dB和1.7-dB。
[Abstract]:In recent years, with the large-scale development of cloud computing and big data services, the demand for information transmission rate and bandwidth is increasing day by day. At present, optical fiber communication as a high speed, large capacity and relatively stable mode of information transmission, has become the only way to solve this need. Polarization multiplexing (Polarization Division Multiplexing, PDM) can directly improve the spectral efficiency by using the polarization characteristics of optical waves and transmitting two channels of signals with the same wavelength polarization state perpendicular to each other in the same channel. At present, PDM technology has been applied to long-distance optical fiber communication system. Compared with the coherent detection demultiplexing technology with complex structure, high cost and large computation, the direct detection demultiplexing technique is more suitable for the detection of short distance optical fiber transmission system because of its low cost and low complexity. At the same time, compared with the Jones matrix space, because of the special three-dimensional space representation method, the signal polarization state (State of Polarization, SOP) and its changing process in transmission can be expressed more intuitively and concretely. So it can flexibly realize polarization demultiplexing and link damage compensation by combining it with digital signal processing technology (Digital Signal Processor, DSP) in electrical domain. Based on the technical principle of PDM, the feasibility of Stokes vector analysis algorithm is studied and verified by software simulation and experimental verification for direct detection of short distance optical fiber transmission system. First of all, based on the theoretical analysis of PDM, this paper introduces the definition, classification, description of polarized light, as well as several commonly used polarization devices and PDM implementation methods. The effects of dispersive (Chromatic Dispersion, CD), random birefringent (Randomly Varying Birefringence), polarization mode dispersion (Polarization Mode Dispersion, PMD) and polarization-dependent loss (Polarization Dependent) on the performance of PDM systems are briefly analyzed. The common methods of polarization demultiplexing for coherent detection and direct detection are briefly introduced, and a simplified Stokes vector algorithm is proposed for Intensity Modulation-Direct detection (IM/DD) system, which simplifies the structure of polarization demultiplexing. The complexity of the algorithm and the cost of the system are reduced. Secondly, the simulation model of PDM-IM/DD system is built by using VPItransmissionMakerTM optical communication simulation platform. The feasibility of the Stokes space and the simplified Stokes vector analysis algorithm is verified, and the conclusion that the polarization demultiplexing effect of the two algorithms is basically the same is obtained. At the same time, the effects of dispersion, polarization mode dispersion (PMD) and polarization dependent loss (PDL) on the transmission performance of PDM-IM/DD systems are analyzed. The simulation results show that the influence of PMD and PDL on the transmission performance of PDM-IM/DD short distance transmission system is negligible. Finally, the single polarization OOK signal transmission system of 20-Gbit/s and the PDM-IM/DD transmission experiment system of 2 脳 10-Gbit/s are built. The performance of the two systems is compared and analyzed at different transmission distances (back to back 10-kmg 25-km), which verifies the feasibility of simplified Stokes algorithm in PDM-IM/DD systems. The experimental results show that under the same BER (10-4), the power loss costs of PDM systems with different transmission distances (back-to-back 10-km) are only 0.3-dB 0.2-dBO 0.2-dBand PDM systems with the same BER (10-4), respectively, compared with single-polarization systems, the power loss costs of PDM systems are only 0.3-dBU 0.2-dBO 0.2-dB0.2dB. the BER of PDM systems is the same (10-4). Compared with the case of back-to-back transmission of 10-km and 25-km, the cost of power loss is only 1-dB and 1.7 dB, respectively.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.11

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