【摘要】：隨著相干光通信技術(shù)的發(fā)展,越來(lái)越多的高級(jí)調(diào)制格式得到廣泛使用。為了滿足不同傳輸業(yè)務(wù)和網(wǎng)絡(luò)升級(jí)需求,未來(lái)的光纖通信網(wǎng)絡(luò)是異構(gòu)的,同一網(wǎng)絡(luò)中可能同時(shí)并存多種調(diào)制格式和速率的信號(hào)。因此調(diào)制格式識(shí)別技術(shù)對(duì)異構(gòu)光纖網(wǎng)絡(luò)的管理控制以及自適應(yīng)光信號(hào)接收都有重要的價(jià)值。本論文圍繞一種基于四波混頻的全光信號(hào)調(diào)制格式識(shí)別器件展開了理論研究,首先證明了信號(hào)脈沖峰值功率隨色散的變化與信號(hào)調(diào)制格式有關(guān),其次基于光纖四波混頻理論建立了器件的理論模型,利用了四波混頻提供的非線性功率傳輸函數(shù)(NPTF)實(shí)現(xiàn)了脈沖峰值功率變化到輸出端閑散光平均功率變化的映射,并針對(duì)不同調(diào)制格式研究了NPTF的優(yōu)化方法,提高了PTF輸出曲線的對(duì)比度以便于特征識(shí)別。在此基礎(chǔ)上計(jì)算得到了十種常用的調(diào)制格式的上述特性曲線,采用簡(jiǎn)單的互相關(guān)算法和支持向量機(jī)算法實(shí)現(xiàn)了十種常用的調(diào)制格式的準(zhǔn)確識(shí)別。此外,還對(duì)偏振復(fù)用信號(hào)的識(shí)別進(jìn)行了研究。最后還討論了不同速率信號(hào)調(diào)制格式的識(shí)別方法。本論文提出的識(shí)別方法無(wú)需任何先驗(yàn)信息,對(duì)信號(hào)速率無(wú)限制,適用于開關(guān)調(diào)制和高級(jí)調(diào)制格式信號(hào)以及CD和OSNR劣化的信號(hào),系統(tǒng)僅采用低速的光探測(cè)器和普通光濾波器,無(wú)需精密的光譜分析和復(fù)雜的數(shù)據(jù)處理器件,具有結(jié)構(gòu)簡(jiǎn)單,性價(jià)比高的優(yōu)點(diǎn)。
[Abstract]:With the development of coherent optical communication technology, more and more advanced modulation formats are widely used. In order to meet the needs of different transmission services and network upgrading, the future optical fiber communication network is heterogeneous, and a variety of modulation formats and rate signals may coexist in the same network at the same time. Therefore, modulation format recognition technology has important value in the management and control of heterogeneous optical networks and adaptive optical signal reception. In this paper, a four-wave mixing-based all-optical signal modulation format recognition device is studied theoretically. Firstly, it is proved that the variation of the peak power of the signal pulse with dispersion is related to the signal modulation format. Secondly, based on the theory of fiber four-wave mixing, the theoretical model of the device is established. The nonlinear power transfer function (NPTF) provided by the four-wave mixing is used to realize the mapping of the change of pulse peak power to the average power change of idle light at the output end. The optimization method of NPTF is studied for different modulation formats, and the contrast of PTF output curve is improved to facilitate feature recognition. On this basis, the above-mentioned characteristic curves of ten common modulation formats are calculated, and the accurate recognition of ten common modulation formats is realized by using simple cross-correlation algorithm and support vector machine (SVM) algorithm. In addition, the recognition of polarization multiplexing signal is also studied. Finally, the recognition methods of modulation formats for different rate signals are discussed. The recognition method proposed in this paper does not require any prior information and has no limitation on the signal rate. It is suitable for switching modulation and advanced modulation format signals as well as for the degraded signals of CD and OSNR. The system only uses low-speed photodetectors and ordinary optical filters. Without the need for precise spectral analysis and complex data processing devices, it has the advantages of simple structure and high cost-to-performance ratio.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN929.1;TN761

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 盧智嘉;王現(xiàn)彬;李莉;李玉萍;江鋒;劉振永;;高速光纖系統(tǒng)中光雙二進(jìn)制傳輸性能分析[J];光通信技術(shù);2015年02期

2 唐進(jìn);陳林;肖江南;;偏振復(fù)用QPSK相干光數(shù)字通信系統(tǒng)實(shí)驗(yàn)研究[J];光電子.激光;2012年10期

3 彭勃;熊剛;;一種基于二次譜線生成的碼速率識(shí)別方法[J];電訊技術(shù);2010年03期

相關(guān)碩士學(xué)位論文 前2條

1 孫思民;基于四波混頻的多功能全光信號(hào)性能監(jiān)測(cè)與處理器件研究[D];華中科技大學(xué);2013年

2 李麗;基于四波混頻的全光色散監(jiān)測(cè)器件的理論與設(shè)計(jì)方法研究[D];華中科技大學(xué);2011年

，

本文編號(hào)：2464168