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通过建立等效噪音源模型分析了SOA的ASE噪音对基于SOA—DI的全光自同步时钟提取装置性能的影响,给出了数学模型并进行了数值理论仿真.仿真结果表明,与不考虑噪音的情况相比,其它参量一定时,随着DI延迟时间减小到某一定值,装置的消光比(CR)不再增加而是急剧减小.在仿真结果基础上,通过设计不同参量值可以抵消噪音的影响,优化系统性能. 相似文献
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研究了电吸收调制器(EAM) 的衰减随外加反向电压增加而指数增加的情形下,短脉冲光源的脉冲输出和解复用器的开关窗口对EAM 的消光效率、反向DC 偏置电压以及正弦RF 驱动信号的幅度等参量的依赖关系- 在基于EAM 的短脉冲光源中,输出脉冲的消光比等于EAM 消光效率η与正弦驱动电压峰峰值Vpp 的乘积,输出光脉冲的消光比和脉宽均与EAM 的反向偏置电压无关,但输出脉冲的峰值功率与η、Vpp 和Vb 都有关系- 在基于EAM的解复用器中,为了使解复用器的开关窗口近似为矩形,可利用EAM 的削波效应,使Vpp/2> Vb- 在EAM 的消光效率η已知时,通过仔细设计反向DC 偏置电压Vb 和正弦驱动电压的峰峰值Vpp ,达到OTDM 解复用器所需要的开关窗口形状、宽度和消光比- 相似文献
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A scheme of flexible colorless remote note with reflective semiconductor optical amplifier (RSOA) assisted Michelson interferometer is proposed. This is capable of generating an optical carrier suppressed signal at a specific radio frequency to suppress the penalty brought about by Rayleigh backscattering and reflection in a full-duplex single fiber transmission network. Simulations are conducted, and the validation of the proposal is discussed by observing the penalty eye opening factor. The results are us... 相似文献
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The present paper proposes a novel design for achieving single-polarization single-mode (SPSM) operation at 1550 nm in photonic crystal fiber (PCF), using a rectangular-lattice PCF with two lines of three central air holes enlarged. The proposed PCF composed entirely of silica material is modeled by a full-vector finite element method with anisotropic perfectly matched layers. Simulations show that single-polarization operation within broad wavelength range can be easily realized with the proposed structure. The wideband SPSM operation features, the low confinement losses, and the small effective mode area are the main advantages of the proposed PCF structure. A SPSM-PCF with confinement loss less than 0.1 dB/km within wavelength range from 1370 to 1610 nm and effective mode area about 4.7μm2 at 1550 nm is numerically demonstrated. 相似文献
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Nonlinear-optical-loop-mirror wavelength conversion is studied in details. A set of two-phase-shiftedBragg gratings are introduced into the coverter,serving as a narrow band-pass filter to remove newfrequencies generated by walk-off and to compensate the dispersion. Numerical simulations are performedto validate our method. The results show that the converted pulses after the filter are reshaped and,sometimes, even compressed. 相似文献
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级联EDFA光纤传输系统级间损耗的优化 总被引:1,自引:0,他引:1
本文首先推导了给定传输距离条件下,单信道级联EDFA接收信噪比的一般表达式.分析表明,单信道情况下,EDFA的间隔越小,增益越低,信噪比越高.在此基础上,提出了“满足最小接收信噪比要求”的优化准则.对波分复用系统,我们提出了“使最小信噪比最大”的优化准则.实际模拟的结果证明了方法的可行性.采用此法可同时使信这间信噪比差别达到最小. 相似文献