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差分相移键控(DPSK)调制方式和色散管理孤子传输方式的结合能抵制噪声和非线性损伤,在高速(40 Gbit/s以上)多信道系统中具有突出的优点。采用变分法分析了多波长信道的放大自发辐射(ASE)噪声、信号间的非线性串扰(ISI)等多种扰动因素引起差分相移键控色散管理孤子系统的均方根相位抖动,给出了扰动的作用区域以及各扰动的大小。研究发现,放大自发辐射引起的抖动与传输距离成三次方的关系,而交叉相位调制(XPM)引起的抖动与距离近似成线性关系。通过优化选择色散管理图强度范围1.5~3.5,各种扰动得到了抑制,而以放大自发辐射扰动抑制为最大,此时要远低于交叉相位调制引起的抖动,然后分别是交叉相位调制-放大自发辐射扰动和交叉相位调制,从而波分复用系统主要来自于增加信道数这一客观限制。
The combination of differential phase shift keying (DPSK) modulation and dispersion management soliton transmission can resist noise and nonlinear impairments and has outstanding advantages in high-speed (40 Gbit / s or greater) multichannel systems. The variational method is used to analyze the multi-wavelength channels such as amplified spontaneous emission (ASE) noise, inter-signal non-linear crosstalk (ISI) and other perturbation factors that cause the differential phase shift keying dispersion management of the soliton system’s rms phase jitter Out of the area of the disturbance and the size of each disturbance. The study found that scaling the jitter caused by spontaneous emission into a cubic relationship with the transmission distance, while the jitter caused by cross-phase modulation (XPM) is approximately linear with the distance. By optimizing the dispersion management map intensity range from 1.5 to 3.5, all kinds of perturbations are suppressed, and the maximum suppression of the spontaneous emission due to amplification is much lower than the jitter caused by the cross-phase modulation, and then are the cross-phase modulation-amplification Spontaneous emission perturbation and cross-phase modulation, so the WDM system comes mainly from the objective of increasing the number of channels.