RZ-DPSK光信號(hào)新型解調(diào)譯碼系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)
發(fā)布時(shí)間：2018-08-29 11:11
【摘要】：從1966年英籍華人高錕發(fā)表的一篇論文開始,在短短的幾十年間,光纖通信經(jīng)歷了從無到有、從低速到高速、從單波到合波、從短距到長距的飛躍式發(fā)展,而在當(dāng)今世界的通信領(lǐng)域里,光纖通信幾乎無處不在,互聯(lián)網(wǎng)、電信網(wǎng)、廣播電視網(wǎng)等都有著光纖通信的身影,并且它正朝著更快的速率、更大的容量、更遠(yuǎn)的距離大步邁進(jìn)。隨著光纖通信的不斷發(fā)展,為了提高光纖傳輸?shù)乃俾屎捅ＷC傳輸質(zhì)量,在無線通信領(lǐng)域應(yīng)用成熟的調(diào)制解調(diào)技術(shù)開始相繼出現(xiàn)在光纖通信中。目前,光纖通信最常用的調(diào)制技術(shù)是幅度調(diào)制和相位調(diào)制。強(qiáng)度調(diào)制在光纖通信的起步階段應(yīng)用普遍,但是隨著WDM/DWDM網(wǎng)絡(luò)的出現(xiàn)及發(fā)展,相位調(diào)制被廣泛應(yīng)用,DPSK、DQPSK等調(diào)制方式也相繼被應(yīng)用到了10Gbps、40Gbps甚至是100Gbps的光信號(hào)中。本文的主要內(nèi)容是設(shè)計(jì)并實(shí)現(xiàn)了一種新型的RZ-DPSK解調(diào)譯碼系統(tǒng),與普通的RZ-DPSK解調(diào)系統(tǒng)不同的是,本系統(tǒng)采用了SFP+光模塊替代了平衡接收機(jī),并且能夠?qū)崿F(xiàn)信號(hào)的精確解調(diào)并最終譯碼輸出。首先,本文對(duì)DPSK相位調(diào)制解調(diào)的原理進(jìn)行了闡述,分析了選取RZ-DPSK作為通用調(diào)制方式的原因。然后,介紹了系統(tǒng)的軟硬件模塊化設(shè)計(jì)原理、工作流程,并依次對(duì)各硬件模塊和軟件模塊進(jìn)行了描述。隨后,重點(diǎn)介紹了基于數(shù)字平衡檢測的光信號(hào)解調(diào)算法,該算法彌補(bǔ)了SFP+模塊無法返回峰值檢測電平的缺點(diǎn),使得延遲干涉儀的調(diào)整能夠快速準(zhǔn)確。還介紹了基于Berlekamp-Massey迭代的BCH譯碼算法在FPGA中的實(shí)現(xiàn),因?yàn)楸鞠到y(tǒng)采用了FPGA芯片為主要的處理計(jì)算芯片,該算法實(shí)現(xiàn)了實(shí)時(shí)線速糾錯(cuò)譯碼功能,滿足高速信號(hào)的數(shù)據(jù)吞吐量需求。最后,通過現(xiàn)場實(shí)驗(yàn)對(duì)系統(tǒng)延遲干涉儀的解調(diào)精度、調(diào)整時(shí)間和解調(diào)質(zhì)量進(jìn)行了測試和對(duì)比,同時(shí)也對(duì)系統(tǒng)糾錯(cuò)性能進(jìn)行了現(xiàn)場測試,實(shí)驗(yàn)證明了本系統(tǒng)的軟件和硬件的穩(wěn)定性和可靠性都是比較不錯(cuò)的。
[Abstract]:From a paper published in 1966 by Kao Kun, a British Chinese, in a short period of several decades, optical fiber communication has experienced a leap from scratch, from low speed to high speed, from single wave to combined wave, from short distance to long distance. In the field of communication in today's world, optical fiber communication almost everywhere, the Internet, telecommunications network, radio and television networks have optical fiber communication, and it is moving towards faster speed, larger capacity, longer distance stride. With the continuous development of optical fiber communication, in order to improve the transmission rate and ensure the transmission quality, mature modulation and demodulation techniques have been applied to the wireless communication field. At present, the most commonly used modulation techniques in optical fiber communication are amplitude modulation and phase modulation. Intensity modulation is widely used in the initial stage of optical fiber communication, but with the appearance and development of WDM/DWDM network, phase modulation has been widely used in optical signals of 10Gbps40 Gbps or even 100Gbps. The main content of this paper is to design and implement a new RZ-DPSK demodulation and decoding system. Different from ordinary RZ-DPSK demodulation system, this system uses SFP optical module instead of balanced receiver. And can realize the accurate demodulation of the signal and the final decoding output. Firstly, the principle of DPSK phase modulation and demodulation is described, and the reason why RZ-DPSK is chosen as the general modulation mode is analyzed. Then, the design principle and workflow of hardware and software are introduced, and each hardware module and software module are described in turn. Then, an optical signal demodulation algorithm based on digital balance detection is introduced, which makes up for the shortcoming that SFP module can not return peak detection level, which makes the adjustment of delay interferometer fast and accurate. This paper also introduces the implementation of BCH decoding algorithm based on Berlekamp-Massey iteration in FPGA, because the FPGA chip is used as the main processing chip in this system. The algorithm realizes the real-time line speed error correction decoding function and meets the data throughput requirement of high speed signal. Finally, the demodulation accuracy, adjusting time and demodulation quality of the system delay interferometer are tested and compared through field experiments. At the same time, the error correction performance of the system is also tested in the field. The experiment proves that the stability and reliability of the software and hardware are quite good.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN929.11;TN76
本文編號(hào)：2211029
[Abstract]:From a paper published in 1966 by Kao Kun, a British Chinese, in a short period of several decades, optical fiber communication has experienced a leap from scratch, from low speed to high speed, from single wave to combined wave, from short distance to long distance. In the field of communication in today's world, optical fiber communication almost everywhere, the Internet, telecommunications network, radio and television networks have optical fiber communication, and it is moving towards faster speed, larger capacity, longer distance stride. With the continuous development of optical fiber communication, in order to improve the transmission rate and ensure the transmission quality, mature modulation and demodulation techniques have been applied to the wireless communication field. At present, the most commonly used modulation techniques in optical fiber communication are amplitude modulation and phase modulation. Intensity modulation is widely used in the initial stage of optical fiber communication, but with the appearance and development of WDM/DWDM network, phase modulation has been widely used in optical signals of 10Gbps40 Gbps or even 100Gbps. The main content of this paper is to design and implement a new RZ-DPSK demodulation and decoding system. Different from ordinary RZ-DPSK demodulation system, this system uses SFP optical module instead of balanced receiver. And can realize the accurate demodulation of the signal and the final decoding output. Firstly, the principle of DPSK phase modulation and demodulation is described, and the reason why RZ-DPSK is chosen as the general modulation mode is analyzed. Then, the design principle and workflow of hardware and software are introduced, and each hardware module and software module are described in turn. Then, an optical signal demodulation algorithm based on digital balance detection is introduced, which makes up for the shortcoming that SFP module can not return peak detection level, which makes the adjustment of delay interferometer fast and accurate. This paper also introduces the implementation of BCH decoding algorithm based on Berlekamp-Massey iteration in FPGA, because the FPGA chip is used as the main processing chip in this system. The algorithm realizes the real-time line speed error correction decoding function and meets the data throughput requirement of high speed signal. Finally, the demodulation accuracy, adjusting time and demodulation quality of the system delay interferometer are tested and compared through field experiments. At the same time, the error correction performance of the system is also tested in the field. The experiment proves that the stability and reliability of the software and hardware are quite good.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN929.11;TN76
【參考文獻(xiàn)】
相關(guān)期刊論文 前2條
1 惠戰(zhàn)強(qiáng);;全光歸零(RZ)到非歸零(NRZ)碼型轉(zhuǎn)換技術(shù)研究進(jìn)展[J];激光與紅外;2011年05期
2 王磊;裴麗;;光纖通信的發(fā)展現(xiàn)狀和未來[J];中國科技信息;2006年04期
，本文編號(hào)：2211029
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