本文關(guān)鍵詞：光載無線系統(tǒng)中傳輸方案與光域微波信號處理技術(shù)的研究　出處：《北京交通大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： RoF系統(tǒng) 多服務(wù)共存 偏振不敏感RAU 微波光子 光電振蕩器 偏振敏感特性 混頻器

【摘要】：隨著智能手機設(shè)備數(shù)量和互聯(lián)網(wǎng)業(yè)務(wù)的持續(xù)增長,促使基于流媒體技術(shù)的交互式網(wǎng)絡(luò)電視(IPTV)、高清電視(HDTV)、視頻會議等一系列高速率、高質(zhì)量、高帶寬業(yè)務(wù)的不斷發(fā)展,在無線接入網(wǎng)中,用戶對系統(tǒng)容量和速率的需求也不斷提高。受益于光纖傳輸?shù)牡蛽p耗大容量特性,光載無線(RoF)技術(shù)被認(rèn)為是下一代光接入網(wǎng)的關(guān)鍵技術(shù)之一。本論文主要圍繞在RoF系統(tǒng)中信號傳輸方案和微波光子處理技術(shù)兩方面內(nèi)容進(jìn)行了研究。在RoF系統(tǒng)的信號傳輸方案的研究方面,論文主要研究了三類新型的接入技術(shù);在微波光子技術(shù)方面,本文主要探討了微波光子信號的混頻技術(shù)和利用光子濾波器實現(xiàn)頻率相位可調(diào)諧的電振蕩器(OEO)。論文取得的主要研究成果與創(chuàng)新點如下:1.提出了一種基于相位相關(guān)偏振正交光產(chǎn)生(POLG)技術(shù)實現(xiàn)多服務(wù)共存的上行無色化的RoF系統(tǒng),并對該方案進(jìn)行了理論推導(dǎo)和實驗驗證。POLG是由偏振旋轉(zhuǎn)器(PR)與馬赫增德爾調(diào)制器(MZM)的偏振敏感特性實現(xiàn)的,通過射頻信號驅(qū)動調(diào)制器之后,光載波與邊帶相互正交且相位相關(guān)。在這個方案中,通過調(diào)節(jié)遠(yuǎn)端接入單元的偏振控制器,可以針對不同的服務(wù)信號實現(xiàn)不同的調(diào)制方式,例如:低頻信號對應(yīng)雙邊帶調(diào)制;毫米波信號對應(yīng)載波抑制調(diào)制。與此同時,光載波在不使用額外的濾波器和偏振控制器(PC)的情況下,可以被上行信號重新利用實現(xiàn)上行傳輸。因此,該方案成功實現(xiàn)了低頻信號、毫米波信號的下行傳輸和無色化的上行傳輸。2.提出了遠(yuǎn)端接入單元(RAU)偏振不敏感的全雙工毫米波RoF系統(tǒng)架構(gòu)。在這個方案中,通過在RAU端重新利用偏振正交光來實現(xiàn)上行傳輸,使得上行信號的誤碼率(BER)值與入射光信號的偏振狀態(tài)無關(guān)。因此不需要使用偏振追蹤系統(tǒng)來將入射光對準(zhǔn)調(diào)制器主軸,實現(xiàn)了 RAU端的偏振不敏感特性。論文對該結(jié)構(gòu)進(jìn)行了理論分析和實驗驗證。實驗中實現(xiàn)了 1.2Gb/s的下行正交相移鍵控-正交頻分復(fù)用(QPSK-OFDM)信號和5Gb/s的上行開關(guān)鍵控(OOK)信號的傳輸,在背靠背傳輸和經(jīng)過15公里傳輸之后上行信號的誤碼率(BER)值均可以粗略達(dá)到10-9,因此使用該方案不需要使用前向糾錯。通過對上行信號的傳輸,相比于傳統(tǒng)方案,本論文提出的方案中的信號BER曲線更加平穩(wěn),BER值均保持在一個較好的水平內(nèi)。3.提出了兩種補償色散引起的功率衰退的傳輸方案。第一種方法是使用光單邊帶(OSSB)調(diào)制。在這種方案中,利用Sagnac環(huán)和調(diào)制器可以實現(xiàn)光載波邊帶比(OCSR)可調(diào)的OSSB調(diào)制。本論文對這個方案進(jìn)行了實驗驗證。在實驗中,通過調(diào)節(jié)偏振控制器,可以生成從-1OdB到27dB的可調(diào)OCSR的OSSB調(diào)制。該方案具有波長不依賴特性,可以支持低頻微波帶寬和靈活的波長選擇。第二種方法是基于POLG技術(shù)來實現(xiàn)。在中心站中,使用PR和MZM來實現(xiàn)POLG。在遠(yuǎn)端接入單元中,通過調(diào)節(jié)PC,可以控制光載波和邊帶之間的相位差,進(jìn)而可以改變不同的射頻服務(wù)的頻率響應(yīng)。在實驗中實現(xiàn)了在25公里和30公里光纖傳輸之后,將不同射頻服務(wù)的頻率響應(yīng)值從最低點平移到最高點。4.基于Sagnac環(huán)和MZM的偏振相關(guān)調(diào)制原理,提出并實驗驗證了實現(xiàn)微波光子混頻器的新方案。該方案在Sagnac環(huán)中使用了一個雙平行MZM(DPMZM),利用其行波特性,使得環(huán)中正向經(jīng)過的光被光單邊帶(OSSB)調(diào)制,而相反方向沒有被調(diào)制。兩個方向的光經(jīng)過偏振合成器(PBC)結(jié)合之后,生成了部分正交的OSSB信號。生成的信號入射到偏振相關(guān)的MZM中,再經(jīng)過起偏器和光探測器之后實現(xiàn)了相位穩(wěn)定的微波信號。通過調(diào)節(jié)MZM的偏置電壓,實驗生成了加載到8GHz微波上的1Gb/s的OOK、幅移鍵控(ASK)信號和二進(jìn)制相移鍵控(BPSK)信號的清晰的眼圖和波形圖,實現(xiàn)了微波信號的光域混頻。5.提出并理論分析和實驗驗證了基于受激布里淵散射(SBS)和DPMZM實現(xiàn)OEO的頻率和相位可調(diào)諧特性的方案。在該方案中,DPMZM用來實現(xiàn)載波相移的雙邊帶調(diào)制,SBS效應(yīng)用來選取OEO環(huán)中的振蕩頻率。通過調(diào)節(jié)DPMZM的偏置電壓,可以改變光載波和邊帶的相位差,從而實現(xiàn)OEO的相位可調(diào);受益于布里淵頻移的波長依賴特性,通過調(diào)節(jié)輸入載波的波長實現(xiàn)OEO的頻率可調(diào)特性。本論文實驗生成了頻率為8.950GHz到9.351GHz,相位為0°到360°可調(diào)的微波信號。
[Abstract]:With the continued growth of the intelligent mobile phone equipment and the number of the Internet business, the interactive network TV based on Streaming Media Technology (IPTV), high definition television (HDTV), the development of video conference and a series of high speed, high quality, high bandwidth services, in the wireless access network, the user needs to system capacity and rate of continuous improvement. The optical wireless (RoF) technology is considered to be one of the key technologies of the next generation optical access network, which has benefited from the low loss and large capacity characteristics of optical fiber transmission. This thesis focuses on two aspects of the signal transmission scheme and the microwave photon processing technology in the RoF system. In the study of signal transmission scheme of RoF system, this paper mainly studies three kinds of new access technologies; in microwave photonic technology, this paper mainly discusses the electric oscillator mixing technique for microwave photonic signals and frequency tunable phase using photonic filter (OEO). The main research achievements and innovations of the paper are as follows: 1., a RoF system based on phase correlation polarization quadrature light generation (POLG) technology is proposed to achieve multi service coexistence and uplink colorless. The theoretical derivation and experimental verification of the scheme are carried out. POLG is realized by polarization sensitive property of polarization rotator (PR) and Machka Del modulator (MZM). After driving the modulator through RF signal, the optical carrier and sideband are orthogonal and correlated. In this scheme, by adjusting the polarization controller of the remote access unit, different modulation modes can be achieved for different service signals, for example, the low-frequency signal corresponds to the bilateral band modulation, and the millimeter wave signal corresponds to the carrier suppressed modulation. At the same time, the optical carrier can be reused by the uplink signal to achieve uplink transmission without the use of additional filters and polarization controllers (PC). Therefore, the scheme has successfully realized the downlink transmission of low frequency signal, millimeter wave signal and the uplink of colorless transmission. 2. a full duplex millimeter wave RoF system architecture for remote access unit (RAU) polarization insensitivity is proposed. In this scheme, the upstream transmission is realized by using the polarization quadrature light at the RAU terminal, which makes the bit error rate (BER) of the upstream signal independent of the polarization state of the incident light signal. Therefore, the polarization tracking system is not needed to align the incident light with the spindle of the modulator, and the polarization insensitivity of the RAU end is realized. This paper has carried on the theoretical analysis and experimental verification to the structure. Experiment to achieve downlink orthogonal 1.2Gb/s phase shift keying orthogonal frequency division multiplexing (QPSK-OFDM) uplink key switch signal and 5Gb/s control (OOK) signal transmission, in back-to-back transmission and after 15 km transmission of uplink signal bit error rate (BER) value can be roughly 10-9, so the use of the scheme need to use fec. Compared with the traditional scheme, the BER curve of the proposed scheme is more stable and the BER values are kept at a good level through the uplink signal transmission. 3. the transmission scheme of two kinds of compensation dispersion caused by power decline is proposed. The first method is to use the optical single side band (OSSB) modulation. In this scheme, the OSSB modulation of the optical carrier band ratio (OCSR) can be realized by using the Sagnac ring and modulator. In this paper, the experimental verification of this scheme is carried out. In the experiment, the OSSB modulation of an adjustable OCSR from -1OdB to 27dB can be generated by adjusting the polarization controller. The scheme has no dependence on wavelength, and it can support low frequency microwave bandwidth and flexible wavelength selection. The second method is based on POLG technology. In the central station, use PR and MZM to implement POLG. In the remote access unit, the phase difference between the optical carrier and the side band can be controlled by adjusting the PC, and the frequency response of different radio frequency services can be changed. In the experiment, the frequency response values of different RF services were moved from the lowest point to the highest point after the optical fiber transmission of 25 km and 30 km. 4. based on the principle of polarization dependent modulation of Sagnac ring and MZM, a new scheme for realizing microwave photonic mixer is presented and verified experimentally. The scheme uses a double parallel MZM (DPMZM) in the Sagnac ring, and uses the traveling wave property to make the light passing through the loop modulated by the optical single sideband (OSSB), while the opposite direction is not modulated. After the light of two directions is combined with a polarization synthesizer (PBC), a partially orthogonal OSSB signal is generated. The generated signal is incident into the polarization dependent MZM, and then the phase stable microwave signal is realized after the polarizer and the photodetector. Through adjusting the bias voltage of MZM, the generation is loaded into 8GHz microwave 1Gb/s on OOK, amplitude shift keying (ASK) signal and binary phase shift keying (BPSK) signal of the clear eye diagram and waveform diagram, realize the mixing of microwave signals in optical domain. 5. a scheme based on stimulated Brillouin scattering (SBS) and DPMZM to realize the frequency and phase tunable characteristics of OEO is presented and proved by theory and experiment. In this scheme, DPMZM is used to realize the bilateral band modulation of carrier phase shift, and the SBS effect is used to select the oscillating frequency in the OEO ring. By adjusting the bias voltage of DPMZM, the phase difference between optical carrier and sideband can be changed, so that the phase of OEO can be adjusted. It benefits from the wavelength dependent characteristics of Brillouin frequency shift and adjusts the frequency tunable characteristic of OEO through adjusting the wavelength of input carrier. In this paper, a microwave signal with a frequency of 8.950GHz to 9.351GHz and a phase adjustable from 0 to 360 degrees is generated.
【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】：TN915.63

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