正交频分复用新技术在光纤传输系统中的应用研究

发布时间：2018-04-29 12:17

  本文选题：光正交频分复用 + 小波包变换　； 参考：《电子科技大学》2014年博士论文

【摘要】：光正交频分复用(OOFDM)技术以其卓越的对色散及偏振模色散容忍能力、高效的频谱效率(SE)等特点受到广泛关注。OOFDM技术能够与高阶调制技术、波分复用(WDM)和偏振复用(PDM)等技术相结合,从而提高光纤传输系统的传输速率、色散容限和频谱利用率。本文针对OOFDM在WDM-PON系统、强度调制/直接探测(IMDD)和相干光探测单模光纤传输系统、全光OFDM(AO-OFDM)系统,以及数据中心多模光纤传输系统等环境中的应用,提出四种OOFDM中的新技术,并分别对其在光纤传输系统中的应用进行了理论仿真,同时展开相关实验对提出的理论进行验证。主要创新工作概括如下:1.提出基于部分子载波空置OFDM(PCF-OFDM)技术的WDM-PON和IMDD光纤传输系统,通过理论分析和系统仿真,研究了PCF-OFDM对光纤传输中四波混频(FWM)非线性效应的抑制问题;通过基于PCF-OFDM的IMDD光纤传输系统实验对理论分析和系统仿真进行验证,结果表明采用均匀间隔子载波距离的PCF-OFDM可以较好地抑制FWM非线性效应和因直接探测带来的噪声影响。2.提出在光纤通信系统中将小波包变换(WPT)替代FFT变换用于OFDM技术中实现子载波的正交调制,即WPT-OFDM。对IMDD WPT-OFDM和相干WPT-OFDM光纤传输系统方案进行系统仿真分析,结果表明将WPT-OFDM应用于光纤传输系统是可行的,可以作为OOFDM技术的可选方案;在对相干WPT-OFDM光纤系统的研究中,对不同正交镜像滤波器(QMF)组长度和不同小波族的WPT变换分别进行仿真分析,并与传统的基于FFT变换的相干光OFDM(CO-OFDM)传输系统的传输性能进行比较。结果表明,部分小波母函数可替代FFT用于光纤传输系统;通过IMDD WPT-OFDM光纤传输系统实验对理论仿真结果进行验证,结果证实了采用IMDD WPT-OFDM在光纤系统传输的可行性。3.针对高速光纤传输系统中接收端因电子瓶颈限制而无法进行高速信号接收的问题,提出基于AO-OFDM技术的非对称接收机/发射机系统结构,即在高速AO-OFDM光纤传输系统中,接收端采用多个通用商用相干接收机对AO-OFDM信号进行并行接收,以达到利用现有较低带宽相干接收机进行高速AO-OFDM信号接收的目的。方案中,AO-OFDM信号通过光带通滤波器(OBPF)被分成带宽相等的几部分信号,每部分信号采用通用相干接收机进行接收,OBPF带宽与接收机可接收带宽匹配,同时,利用多级级联MZDIs实现全光FFT(OFFT)变换,用于实现AO-OFDM信号的光域解复用。基于现有PDM-QPSK单载波系统,提出并成功实现Tb/s光纤传输系统的长程传输,并对该系统在无色散补偿光纤情况下,因光门采样对信号造成的损伤问题进行了分析。4.在现有基于FPGA的实时IMDD OFDM光纤传输系统实验平台上,提出并设计完成智能实验平台。通过该智能实验平台可以实现自动自适应比特分配和功率分配,以及传输性能的在线实时监测。该实验平台不仅简化了未来高级OOFDM收发机的实验设计,同时也为将来在该实验平台上添加更多智能化功能提供了方便。5.提出并实验验证基于无温控直接调制光注入锁定垂直腔面发射激光器(OIL-VCSEL)的实时双带OOFDM收发机设计的光纤传输系统,OIL-VCSEL的有效带宽和频谱响应可在光域(主激光器注入波长和光功率、偏振控制)和电域(VCSEL偏置电流)进行调节。利用采样率低至4 GS/s的DAC/ADC实现自适应OOFDM信号在IMDD的OM2多模光纤中进行传输。同时,由于OIL条件的变化会带来OIL-VCSEL有效调制带宽范围内频率响应的显著变化,因此针对系统总传输速率的变化进行了进一步研究。
[Abstract]:Optical orthogonal frequency division multiplexing (OOFDM) technology is widely concerned with its excellent characteristics of dispersion and polarization mode dispersion tolerance, high efficiency spectrum efficiency (SE) and so on..OOFDM technology can be combined with high order modulation technology, wavelength division multiplexing (WDM) and polarization multiplexing (PDM), so as to improve the transmission rate, dispersion tolerance and capacity of optical fiber transmission system. Based on the application of OOFDM in WDM-PON system, intensity modulation / direct detection (IMDD) and coherent optical detection single mode optical fiber transmission system, all optical OFDM (AO-OFDM) system, and data center multimode optical fiber transmission system, four new technologies in OOFDM are proposed and applied to the optical fiber transmission system respectively. The theoretical simulation is carried out, and the relevant experiments are carried out to verify the proposed theory. The main innovations are summarized as follows: 1. the WDM-PON and IMDD fiber transmission systems based on partial subcarrier vacancy OFDM (PCF-OFDM) technology are proposed. The nonlinear effect of PCF-OFDM on four wave mixing (FWM) in optical fiber transmission is studied by theoretical analysis and system simulation. Through the experiment of IMDD fiber transmission system based on PCF-OFDM, the theoretical analysis and system simulation are verified. The results show that the PCF-OFDM with uniform spaced subcarrier distance can better suppress the nonlinear effect of FWM and the influence of the noise caused by direct detection..2. can transform the wavelet packet transform (WPT) in the optical fiber communication system (WPT). Instead of FFT transform, it is used in the orthogonal modulation of subcarriers in OFDM technology. That is, WPT-OFDM. is used to simulate the system of IMDD WPT-OFDM and coherent WPT-OFDM fiber transmission system. The result shows that it is feasible to apply WPT-OFDM to the optical fiber transmission system and can be used as an alternative for OOFDM Technology; in the coherent WPT-OFDM optical fiber system, it can be used as an alternative to the optical fiber transmission system. In the study, the simulation analysis of the length of the different orthogonal mirror filter (QMF) group and the WPT transform of different wavelet families is carried out respectively, and the transmission performance of the coherent optical OFDM (CO-OFDM) transmission system based on the traditional FFT transform is compared. The results show that the partial wavelet mother function can be used instead of FFT for the optical fiber transmission system and through IMDD WPT-OFDM light. The results of the theoretical simulation are verified by the fiber transmission system experiment. The result proves that the feasibility of the transmission of IMDD WPT-OFDM in the optical fiber system is that the receiver can not receive high speed signal due to the restriction of the electronic bottleneck in the high speed fiber transmission system. The structure of the asymmetric receiver / transmitter system based on the AO-OFDM technology is proposed. In the high speed AO-OFDM fiber transmission system, the receiver uses multiple general commercial coherent receivers to carry out parallel reception of AO-OFDM signals to achieve high speed AO-OFDM signal reception using the existing lower bandwidth coherent receivers. In the scheme, the AO-OFDM signal is divided into several parts with equal bandwidth through the band pass filter (OBPF). Each signal is received by a universal coherent receiver, and the OBPF bandwidth is matched with the receiver's receiving bandwidth. At the same time, all optical FFT (OFFT) transforms are implemented by multistage cascade MZDIs to realize the optical domain demultiplexing of the AO-OFDM signal. Based on the existing PDM-QPSK single carrier system, the long range of the Tb/s fiber transmission system is successfully implemented and implemented. In the case of a colorless compensation fiber, the system is analyzed for the damage caused by the optical gate sampling. On the existing FPGA based real-time IMDD OFDM optical fiber transmission system experiment platform, the intelligent experimental platform is proposed and designed. The automatic adaptive bit allocation can be realized through the intelligent testing platform. The experimental platform not only simplifies the experimental design of the advanced OOFDM transceiver in the future, but also provides more convenient.5. and experimental verification for the vertical cavity surface emitting laser based on the non temperature controlled direct modulation optical injection locking. (OIL-VCSEL) a optical fiber transmission system designed for a real-time dual band OOFDM transceiver, the effective bandwidth and spectrum response of OIL-VCSEL can be adjusted in the optical domain (primary laser injection wavelength and light power, polarization control) and electric domain (VCSEL bias current). The OM2 multimode fiber of adaptive OOFDM signal in IMDD is realized by using a DAC/ADC with a low sampling rate of 4 GS/s. At the same time, the changes in the total transmission rate of the system are further studied because the changes in the OIL condition will bring about significant changes in the frequency response within the bandwidth of the effective modulation bandwidth of the OIL-VCSEL.

【学位授予单位】：电子科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN929.11
，

本文编号：1819904