基于光纤参量放大器的全光信号处理技术的研究

发布时间：2017-12-28 18:39

  本文关键词：基于光纤参量放大器的全光信号处理技术的研究　出处：《华中科技大学》2016年博士论文　论文类型：学位论文

  更多相关文章： 光纤通信 参量放大器 相位敏感放大器 相位匹配 全光信号处理 先进调制码型 参量光开关

【摘要】：光信号处理是未来超高速超大容量超长距离(3U)光传输的关键技术。传统的光-电-光的信号处理方式技术已经日臻成熟,但是系统结构比较复杂,成本昂贵,功耗高,对调制速率和调制格式不透明,光电转换效率较低,受到电子处理速度瓶颈的限制等,无法满足未来波分复用(WDM)光网络超高速光信号处理的要求。全光信号处理技术具有飞秒量级的响应时间,功耗低,对光信号的调制速率和调制格式透明,具有广泛的应用前景。本论文主要研究了基于光纤参量放大器(FOPA)的全光信号处理技术,包括宽带低噪声光放大,差分移相键控(DPSK)及正交移相键控(QPSK)信号的全光相位和幅度再生、全光波长转换和组播技术,以及相位不敏感(PI)和相位敏感(PS)参量光开关,取得的主要的研究成果包括:1)基于双泵浦单模式相位敏感光纤参量放大器(PS-FOPA)的三波模型,推导了输出光信号功率和相位的解析表达式,可以直观显示信号光的相位敏感增益特性和阶梯型相位传递函数。为了研究高阶四波混频过程对信号光增益的影响,建立了双泵浦单模式PS-FOPA的七波模型,研究发现当双泵浦波长间隔变化时,高阶四波混频过程中信号光和高阶闲频光之间存在相互功率转移,因此存在最优的双泵浦光波长间隔以获得最高的信号光增益。进一步地优化双泵浦光波长间隔和输入功率,信号光和高阶闲频光同时出现增益消光比(GER)反转,可用于同时实现DPSK信号的全光相位再生和波长转换功能。2)通过七波模型研究了基于双泵浦单模式PS-FOPA实现DPSK全光再生的波长组播功能。通过优化系统参数,实现了一个波长到九个输出波长的DPSK全光再生的波长组播,再生后的各组播信道的DPSK光信号Q因子提高了1.5dB以上,光信噪比(OSNR)代价降低了3dB。研究还发现双泵浦单模式PS-FOPA中高阶四波混频边带的产生有助于降低泵浦光到信号光的强度调制噪声转移。3)基于双共轭泵浦简并PS-FOPA实现了一个波长到三个输出波长的全光QPSK相位再生的波长组播。组播信号的相位和输入QPSK信号光相同,优化输入信号光的相对相位和输入泵浦光功率后,当误码率(BER)为10-3时,相位再生的QPSK信号光、组播信号1(Copy1)和组播信号2(Copy2)的OSNR代价分别降低了0.8dB、1.3dB和1.3dB。4)实验测量了相位不敏感参量光开关的静态响应和动态响应的消光比分别为24.5dB和18.8dB。使用单路径实验结构测量了相位敏感参量光开关的静态响应消光比为18.97dB,使用双路径实验结构测量了相位敏感参量光开关的动态响应消光比为10.84dB。建立了相位不敏感和相位敏感参量光开关的数值仿真模型,仿真结果和实验测量结果相符。5)建立了考虑高非线性光纤(HNLF)纵向零色散波长涨落的参量光开关的数值仿真模型,研究了HNLF纵向零色散波长涨落对相位敏感参量光开关的影响。研究发现,一般情况下纵向零色散波长涨落会降低相位敏感参量光开关的消光比,但是某些特定的纵向零色散波长分布反而有助于提升相位敏感参量光开关的消光比;纵向零色散波长涨落还会导致相位敏感参量光开关的非对易传输特性,而且与相位不敏感参量光开关对比,相位敏感参量光开关的非对易传输特性对纵向零色散波长涨落更加敏感;真空噪声放大会影响参量光开关的泵浦消耗,存在最优的输入泵浦光功率以获得最大的相位敏感参量光开关的消光比。
[Abstract]:Optical signal processing is the key technology of ultra high speed ultra long distance (3U) optical transmission in the future. The traditional optical electrical optical signal processing technology has matured, but the system structure is complex, high cost, high power consumption, the modulation rate and modulation format transparency, photoelectric conversion efficiency is low, by the electronic processing speed limit, can not meet the future wavelength division multiplexing (WDM) signal processing of optical network ultra high speed optical requirements. All optical signal processing technology has the response time of femtosecond, low power consumption, transparent modulation rate and modulation format of optical signal, and has a wide application prospect. This paper mainly studies the fiber optical parametric amplifier (FOPA) based on optical signal processing technology, including broadband low noise amplifier, differential phase shift keying (DPSK) and quadrature phase shift keying (QPSK) signal phase and amplitude regeneration, all-optical wavelength conversion and multicast technology, and the phase insensitive (PI) and phase sensitive (PS) parameters of optical switch, the main research achievements include: 1) double pumped single mode phase sensitive optical parametric amplifier (PS-FOPA) based on the three wave model, deduces the output light signal power and phase expressions, you can directly show the phase sensitive gain characteristics and ladder type phase signal transfer function. In order to study the influence of high order four wave mixing process of signal gain, established seven wave model of double pumped single mode PS-FOPA, it is found that when the double pump wavelength interval changes when the signal light and the high order time between power transfer between the high frequency light in order four wave mixing process, so there is an optimal double pump wavelength in order to obtain the interval signal gain the highest. Further, we optimize the wavelength interval and input power of dual pump light. Simultaneously, the gain and extinction ratio (GER) inversion of signal and high order idle frequency light can be used to realize the all-optical phase regeneration and wavelength conversion function of DPSK signal at the same time. 2) the wavelength multicast function of DPSK all-optical regeneration based on double pump single mode PS-FOPA is studied through the seven wave model. By optimizing the system parameters, we realized a wavelength multicast with wavelength to nine output wavelengths and DPSK all-optical regeneration. After regenerated, the Q factor of the DPSK optical signal of all the multicast channels increased by more than 1.5dB, and the optical signal-to-noise ratio (OSNR) cost decreased by 3dB. The study also found that double pumped single mode PS-FOPA high order four wave mixing sideband generation helps reduce noise intensity modulated pump to signal transfer. 3) based on dual conjugate pump degenerate PS-FOPA, a wavelength multicast for all optical QPSK phase regeneration of a wavelength to three output wavelengths is realized. Multicast signal phase and the input QPSK signal light is the same, the optimization of the input signal light phase and input pump power, when the bit error rate (BER) of 10-3, QPSK signal, phase regeneration signal 1 (Copy1) multicast and multicast signal 2 (Copy2) OSNR cost were reduced by 0.8dB, 1.3dB and 1.3dB. 4) the extinction ratio of the static and dynamic response of the phase insensitive optical switch is 24.5dB and 18.8dB, respectively. The static response and extinction ratio of the phase sensitive parametric optical switch are measured by a single path experiment structure. The dynamic response of the phase sensitive parametric optical switch is 10.84dB using the dual path experimental structure. The extinction ratio is 10.84dB. A numerical simulation model of phase insensitivity and phase sensitive optical switch is established, and the simulation results agree with the experimental results. 5) a numerical simulation model of parametric optical switch considering the zero dispersion wavelength fluctuation of high nonlinearity fiber (HNLF) is established. The influence of HNLF longitudinal zero dispersion wavelength fluctuation on the phase sensitive parametric optical switch is studied. The study found that under normal circumstances the longitudinal zero dispersion wavelength will reduce the fluctuation of phase sensitive parameters of the extinction ratio of optical switch, but certain longitudinal zero dispersion wavelength distribution will help to improve the phase sensitive parameters of the extinction ratio of optical switch; longitudinal zero dispersion wavelength fluctuation will cause the phase sensitive parameters of optical switch to transmission characteristics but, with phase sensitive parameters of optical switching contrast, phase sensitive parameters of optical switch to transmission characteristic is more sensitive to the longitudinal zero dispersion wavelength fluctuation; vacuum pump noise amplification will influence parameters of optical switch consumption, input pump power is optimal to obtain maximum phase sensitive parameters of the extinction ratio of optical switch.
【学位授予单位】：华中科技大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN911.74
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本文编号：1346952