论文部分内容阅读
在２．５Ｇｂ／ｓ的光纤通信系统中，通常采用外调制技术以避免光源啁啾对传输距离的限制。这时系统传输特性的恶化主要来源于由光发射源静态谱线中的相位噪声经传输后转化而成的强度噪声（ＰＭ－ＡＭ噪声），以及光纤中的受激布里渊散射。文章通过将ＰＭ－ＡＭ噪声项引入Ｐｅｒｓｏｎｉｃｋ－ＣＣＩＴＴ误码率计算方法，从理论上研究了ＰＭ－ＡＭ噪声对系统传输特性的影响，并通过２．５Ｇｂ／ｓ３００ｋｍ传输实验的结果加以验证，同时也分析了系统中受激布里渊散射阈值与光源线宽的关系。所得的结果可为系统设计工作中综合考虑二者的影响提供一定的依据。
In 2.5Gb / s optical fiber communication system, the external modulation technique is usually adopted to avoid the restriction of the transmission distance by the chirp of the light source. At this time, the deterioration of the transmission characteristics of the system mainly comes from the intensity noise (PM-AM noise) transformed by the transmission of the phase noise in the static emission line of the light emitting source and the stimulated Brillouin scattering in the optical fiber. By introducing PM-AM noise into the calculation of Personick-CCITT bit error rate, the paper studies the effect of PM-AM noise on the transmission characteristics of the system theoretically and verifies the results of 2.5Gb / s 300km transmission experiment, The relationship between stimulated Brillouin scattering threshold and light source linewidth is analyzed. The results obtained for the system design work to consider both the impact of providing some basis.