光偏振編碼通信系統(tǒng)關(guān)鍵技術(shù)的研究
本文關(guān)鍵詞: 偏振鍵控調(diào)制 偏振編碼解調(diào) 雙極性乘法器 光碼分復(fù)用 出處:《北京交通大學(xué)》2017年博士論文 論文類型:學(xué)位論文
【摘要】:光偏振編碼通信是拓展光纖信道帶寬的一種技術(shù),也可應(yīng)用于全光信號處理,其碼元具有信息可擴(kuò)展性強(qiáng)、信道利用率高、保密性好等特點(diǎn)。在努力挖掘帶寬資源、追求光纖更大利用效率的當(dāng)代,光偏振編碼通信技術(shù)研究已成為維度復(fù)用和碼元編碼的主要研究方向。本學(xué)位論文在國家自然基金項(xiàng)目的資助下,針對光偏振編碼通信系統(tǒng)發(fā)射、傳輸和接收各部分中的一些關(guān)鍵問題開展深入的研究工作,以正交偏振調(diào)制為基礎(chǔ)提出一種雙極性光學(xué)編碼新方案,和雙極性序列的乘法器,采用穆勒四元數(shù)對光纖器件進(jìn)行描述,討論了在PMF極端情況及SMF情況下,環(huán)境應(yīng)力對通信系統(tǒng)輸出偏振態(tài)的影響,提出一種差分的任意偏振態(tài)接收器結(jié)構(gòu),提高了偏振態(tài)的接收性能,從實(shí)驗(yàn)上驗(yàn)證了所提出的新型PolSKOCDM系統(tǒng)。本學(xué)位論文的主要工作有:1、分析偏振調(diào)制編碼機(jī)制并對理論結(jié)論進(jìn)行實(shí)驗(yàn)驗(yàn)證。采用Stokes矢量描述分析偏振態(tài)調(diào)制的關(guān)鍵參數(shù),以幅度調(diào)制和相位調(diào)制來實(shí)現(xiàn)任意線偏振態(tài)和任意橢圓偏振態(tài)的調(diào)制。詳細(xì)分析偏振主態(tài)的實(shí)驗(yàn)調(diào)整方法,完成電控SOA、光控SOA和電控LiNb03相位調(diào)制器的偏振調(diào)制實(shí)驗(yàn),實(shí)現(xiàn)三種方式偏振態(tài)調(diào)制。2、分析外界環(huán)境和光纖介質(zhì)對傳輸光信號偏振態(tài)的影響。引入四元數(shù)描述雙折射光纖,分析固有內(nèi)應(yīng)力雙折射和附加外應(yīng)力雙折射對光纖拍長和雙折射軸的影響,對應(yīng)力大小變化和應(yīng)力方向變化對光纖輸出偏振態(tài)的影響進(jìn)行計(jì)算。利用固有雙折射很大的PMF對局部應(yīng)力大小和方向?qū)ζ駪B(tài)輸出的影響進(jìn)行實(shí)驗(yàn)驗(yàn)證,并由PMF理論和實(shí)驗(yàn)結(jié)果推論到SMF的適用應(yīng)力范圍。分析結(jié)論對于穩(wěn)定偏振態(tài)輸出的伺服矯正系統(tǒng)設(shè)計(jì)很有應(yīng)用價(jià)值。3、完成以垂直正交偏振態(tài)為雙極性碼的偏振態(tài)編解碼實(shí)驗(yàn)。正交偏振態(tài)的接收系統(tǒng)用單路偏振分束器解調(diào)出正交的兩路光信號。任意偏振態(tài)接收系統(tǒng),用一路分四路的方法,通過偏振控制器的調(diào)節(jié),得到四個(gè)對應(yīng)Stokes矢量的光強(qiáng)值,即可解算出任意偏振態(tài)。以任意偏振態(tài)接收系統(tǒng)為基礎(chǔ),提出了差分的偏振態(tài)接收系統(tǒng)。4、將正交的線偏振態(tài)和偏振傳輸矩陣抽象為乘法運(yùn)算中的輸入變量,由輸入輸出偏振態(tài)導(dǎo)出雙極性碼對應(yīng)的米勒矩陣,并通過電流控制的SOA偏振旋轉(zhuǎn)效應(yīng),實(shí)現(xiàn)了以垂直正交偏振態(tài)描述的雙極性碼乘法。5、實(shí)現(xiàn)了基于偏振編碼的碼分多址實(shí)驗(yàn)系統(tǒng)。在光信號處理上實(shí)現(xiàn)雙極性乘法器的基礎(chǔ)上,將正交的偏振態(tài)編碼為雙極性用戶碼,實(shí)現(xiàn)了光碼分多址系統(tǒng)的編碼器。以同樣的雙極性乘法器結(jié)構(gòu)實(shí)現(xiàn)了光學(xué)相關(guān)器,以低通濾波器代替積分器,最終恢復(fù)出原始數(shù)據(jù)的波形,實(shí)現(xiàn)了碼分多址系統(tǒng)的解碼器。最終,實(shí)現(xiàn)了基于偏振編碼的碼分多址實(shí)驗(yàn)系統(tǒng)。所取得的創(chuàng)新成果主要有:1、提出一種對于雙極性全光信號處理的新方式。以垂直正交偏振態(tài)對應(yīng)為雙極性碼中的"+1"和"-1",提出了基于正交偏振態(tài)的光信號處理領(lǐng)域雙極性編碼方式。將正交的線偏振態(tài)和偏振傳輸矩陣抽象為乘法運(yùn)算中的輸入變量,由輸入輸出偏振態(tài)導(dǎo)出雙極性碼對應(yīng)的米勒矩陣M(+1)、M(-1)。并通過電流控制的SOA偏振旋轉(zhuǎn)效應(yīng),實(shí)現(xiàn)了以垂直正交偏振態(tài)描述的雙極性碼乘法。2、將正交偏振鍵控調(diào)制機(jī)制引入非相干時(shí)域OCDM編解碼系統(tǒng),提出一種新型OCDM編解碼系統(tǒng),拓展了 OCDM編解碼機(jī)制。3、以正交偏振調(diào)制的雙極性乘法器為基礎(chǔ),實(shí)現(xiàn)了兩個(gè)雙極性序列的乘法運(yùn)算,實(shí)現(xiàn)了偏振鍵控光碼分復(fù)用的編解碼器。在解碼器部分,不僅解決了本地地址碼和到達(dá)信號同步的問題,同時(shí)用低通濾波器替代積分器,實(shí)現(xiàn)了原始用戶數(shù)據(jù)調(diào)制波形的恢復(fù)。4、引入四元數(shù),同時(shí)考慮光纖沿線的內(nèi)應(yīng)力雙折射和外應(yīng)力雙折射,簡化了環(huán)境影響分析。得出光纖受力大小及方向?qū)τ趥鬏斝盘柶駪B(tài)的影響,對于穩(wěn)定偏振態(tài)輸出的伺服矯正系統(tǒng)設(shè)計(jì)有很大幫助。5、提出一種基于差分的偏振態(tài)接收器結(jié)構(gòu),可極大降低非對稱分布偏振態(tài)調(diào)制和解調(diào)受環(huán)境的影響作用。
[Abstract]:Polarization encoding communication is a kind of technology to expand the bandwidth of the optical fiber channel, can also be used in all-optical signal processing, the symbol information has strong scalability, high channel utilization, the characteristics of good secrecy. In efforts to tap the bandwidth resources, the pursuit of greater efficiency in the use of modern optical fiber communication technology, optical polarization encoding has been studied become the main research direction of multiplexing and symbol encoding dimension. In this thesis, in the national natural fund project funding, according to the light polarization encoding communication system transmission, transmission and reception of some of the key issues in various parts to carry out further research work, based on the orthogonal polarization modulation based on a bipolar optical encoding scheme, and the bipolar sequence of the multiplier, fiber devices described Muller four yuan, discussed in the PMF and SMF in extreme circumstances, environmental stress on the communication system of the output polarization state Influence, proposed a differential polarization receiver structure, improve the receiving performance of the polarization model, the proposed PolSKOCDM system was verified by experiment. The main contributions of this dissertation are: 1. The analysis of polarization modulation encoding mechanism and experimental verification of the theoretical conclusion. By using the Stokes vector description of key parameters analysis polarization modulation, with amplitude modulation and phase modulation to achieve modulation arbitrary linear polarization and arbitrary elliptical polarization states. The adjustment method of detailed analysis of the principal states of polarization, complete electronic SOA, SOA and LiNb03 electronic controlled phase modulator polarization modulation experiment, three ways of realizing the polarization modulation of.2, analysis of the impact of the outside world the environment and fiber medium on the transmission of the optical signal polarization. The introduction of four yuan number description of birefringent fiber, analysis of inherent stress birefringence and additional stress birefringence of optical fiber and double beat length Effect of refraction axis, calculate the stress size change and influence of stress direction on fiber output polarization. Using the inherent birefringence of large PMF stress size and direction of polarization of the output of the local test, and PMF is the theoretical and experimental results of the stress range for pushing SMF conclusion. Analysis for the servo stable polarization output correction system design is the application value of.3, complete with orthogonal polarization state is polarization bipolar code decoding experiment. The orthogonal polarization receiving system with single polarization beam splitter to demodulate the optical signals. The orthogonal polarization receiving system and method four road road, by adjusting the polarization controller, light intensity four corresponding Stokes vector values can be calculated with arbitrary polarization. Polarization receiving system as the basis, put forward the difference Polarization receiving system.4, the orthogonal linear polarization and polarization transfer matrix as the input variables of abstract multiplication, the Miller matrix by the corresponding input and output polarization state are bipolar code, and through the SOA polarization rotation effect of current control, realize the bipolar code multiplication.5 description to perpendicular polarization state the experiment system, CDMA based on polarization encoding based bipolar multiplier in optical signal processing, the orthogonal polarization encoding for bipolar user code, realize the OCDMA system with encoder. Bipolar multiplier structure the same realize optical correlator, a low-pass filter instead of integrator finally, to restore the original data waveform, realizes the decoder of CDMA system. Finally, the experimental system based on CDMA polarization encoding. The innovative achievements of the Lord To: 1, put forward a new way for bipolar all-optical signal processing. The vertical orthogonal polarization state corresponding to the bipolar code in the "+1" and "-1", proposed optical signal processing field of bipolar encoding method based on orthogonal polarization state. The orthogonal linear polarization and polarization transfer matrix abstract as the input variables in a multiplication operation, the M Miller matrix corresponding to the input and output state of polarization is derived by bipolar codes (+1), M (-1). And the SOA polarization rotation effect of current control, realize the bipolar code multiplication.2 described by orthogonal polarization, orthogonal polarization modulation mechanism the introduction of non coherent time domain OCDM codec system, proposed a new OCDM codec system, expand the coding mechanism of OCDM.3, with the bipolar multiplier orthogonal polarization modulation based implementation of multiplication of two bipolar sequences, realize polarization keying optical code division Codec multiplexing. At the decoder part, not only solved the local address code and the problem of signal synchronization, and a low pass filter is used to replace the integrator, the original user data modulation waveform recovery.4, the introduction of four yuan, while considering the stress along the fiber birefringence and stress birefringence, simplified the environmental impact analysis. The effects of fiber stress size and direction for the transmission signal state of polarization, the polarization state of the output of the servo correction system design is of great help to.5, put forward a kind of polarization receiver based on differential structure, greatly asymmetric distribution of polarization modulation and demodulation by the role of the environmental impact is reduced.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:TN929.1
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