A tunable broadband Raman wavelength converter
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摘要: 为了提高宽带波长转换技术的响应速度，采用高非线性光子晶体光纤，设计了一种受激喇曼散射的可调谐全光宽带波长转换器。基于光纤中喇曼效应，对光子晶体光纤喇曼增益谱采取高斯曲线进行拟合，建立了喇曼波长转换器的理论模型，并进行了仿真分析，讨论了光纤长度对转换效率的影响。结果表明，在符合通信系统的条件下，实现了100nm转换带宽，波段为1487nm~1587nm，Q因子随探测光波长变化与喇曼增益谱走势相同，其波长转换质量最优处在喇曼增益系数最大处。该研究对未来光网络的波长转换器波长分配以及光纤长度的配置研究具有参考意义。Abstract: In order to improve the response speed of broadband wavelength conversion technology, a tunable all-optical broadband wavelength converter based on stimulated Raman scattering (SRS) using highly nonlinear photonic crystal fiber (PCF) was designed.Based on Raman effect in optical fiber, Raman gain spectrum of photonic crystal fiber was fitted by Gaussian curve.The theoretical model of a Raman wavelength converter was established, and the effect of fiber length on conversion efficiency was discussed.The results show that 100nm conversion bandwidth is achieved under the condition of the communication system.The bandwidth is 1487nm~1587nm.Q factor changes with the wavelength of probe light and the trend of Raman gain spectrum is the same.The best wavelength conversion quality is at the maximum Raman gain coefficient.The study is of great significance to the wavelength assignment of wavelength converters and the configuration of fiber length in future optical networks.
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Figure 3. Waveforms
a—input signal light b—after conversion of 1540nm probe light c—after conversion of 1565nm probe light
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Figure 4. Eye diagram
a—after conversion of 1540nm probe light conversion eye diagram b—after conversion of 1565nm probe light conversion eye diagram
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