基于微环谐振器和窄带滤波器的全光归零到非归零码型转换  

All-Optical RZ-to-NRZ Format Conversion Based on Micro-Ring Resonator and Narrow Bandpass Filter

作　　者：董小伟[1] 谢媛[1] 刘文楷[1] 

机构地区：[1]北方工业大学电子信息工程学院,北京100144

出　　处：《激光与光电子学进展》2015年第2期109-114,共6页Laser & Optoelectronics Progress

基　　金：北京市属高等学校高层次人才引进与培养计划(CIT&TCD201304001);北京市委组织部优秀人才项目(2012D005002000001);北方工业大学科研人才提升计划项目(CCXZ201307)

摘　　要：基于信号频谱变换的原理,利用微环谐振器的梳状谱传输特性,辅助以窄带滤波器,将全光归零(RZ)码信号的频谱包络转变为较理想的非归零(NRZ)码信号的频谱包络,从而实现RZ码到NRZ码的码型转换。详细研究了转换后的NRZ信号眼图质量与设备因素,如窄带滤波器的选择、微环谐振器的耦合条件以及输入信号RZ码占空比的关系。结果表明窄带滤波器为2阶巴特沃斯滤波器时,微环谐振器的耦合条件以及RZ码占空比对码型转换效果的影响较小。另外,通过调整微环谐振器的尺寸,设计的码型转换器能与不同速率的系统相兼容,能更好地适应未来光网络的发展。Based on signal spectral transforming principle, an all-optical return-to-zero（RZ） to non-return-tozero（NRZ） format conversion is realized by using a micro-ring resonator with the comb transmission spectrum and a narrow bandpass filter. Influences of devices′ parameters, such as different narrow bandpass filters, coupling conditions of micro-ring resonator and duty ratio of the RZ input signal, on eye-diagram quality of converted NRZ signal are investigated in detail. Results demonstrate that 2-order Butterworth filter is expected to decrease the influences of coupling conditions and the duty ratio of RZ signal on the conversion performances. In addition, by adjusting the ring-resonator size, the designed RZ-to-NRZ format converter is compatible with system having several bit rates signals. This will be better adapt to the development of future optical networks.

关 键 词：光通信 码型转换 微环谐振器 归零码 非归零码 

分 类 号：TN253[电子电信—物理电子学]