摘要
针对直接检测光正交频分复用(DDO-OFDM)系统产生的放大器自发辐射(ASE)拍频噪声。通过对系统受ASE噪声影响的数学分析得到噪声影响机理及系统信噪比表达式,根据理论推导提出载波抑制方案,通过数字仿真验证推导结果及方案可行性。理论分析和仿真结果表明,系统受ASE拍频噪声影响严重,合理选择带通滤波器带宽可有效降低噪声影响;通过加入载波抑制可有效提高系统性能,当载波抑制比为0 dB时系统性能最佳。
Optical orthogonal frequency division multiplexing（O-OFDM） has been demonstrated to combat fiber chromatic dispersion（CD） and polarization-mode dispersion（PMD）,which is being considered as a promising technology for future long-haul optical transmission.Because of computation efficiency and lower cost,the direct detection optical OFDM（DDO-OFDM） system is one of its schemes.However,the amplified-spontaneous noise induced by direct-detection seriously affects the system performance.The impact of noise introduced by amplified-spontaneous emission（ASE） is investigated and the signal-to-noise expression is got.Additionally,a carrier suppression scheme is presented.With such a scheme,the numerical simulation is done to validate the feasibility of the system.Analysis and simulation results show that the system performance is impacted by the bandwidth of band-pass filter and the optimal carrier suppression index is 0 dB for DDO-OFDM system.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2011年第9期1337-1341,共5页
Journal of Optoelectronics·Laser
基金
国家自然科学基金资助项目(60871075)
关键词
直接检测
自发辐射噪声
正交频分复用
载波抑制
direct detection
amplified-spontaneous noise
orthogonal frequency division multiplexing（OFDM）
carrier suppression
