频率间隔可调的平坦多载波光源结构设计  

Design of Flat Multi-carrier Light Source with Adjustable Frequency Spacing

作　　者：韩一石[1] 陆敏婷 郑俊文 付晨远 余剑钊 HAN Yi-shi;LU Min-ting;ZHENG Jun wen;FU Chen-yuan;YU Jian-zhao(School of In l~＊rmation Engineering, Guangdong Uiliversity of Technology, Guangzhou 510006, China)

机构地区：[1]广东工业大学信息工程学院,广州510006

出　　处：《光子学报》2018年第5期116-123,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61471130);广东省科技计划(No.2016B090918060);广州市科技计划(No.201604016079)资助~~

摘　　要：为了克服密集波分复用系统中多个光源难以同步且成本高等缺点,提出了一种平坦度好、子载波数多、频谱宽度大且频率间隔可调的多载波光源生成结构.系统结构由马赫增德尔调制器、电吸收调制器和相位调制器级联组成,在单一正弦信号驱动下,输出多个低平坦度、频率间隔可调的子载波.在驱动信号频率为9和12.5GHz,系统生成的子载波数量为31个的条件下,平坦度可达到0.09dB.当驱动信号频率在3GHz^16GHz范围变化时,输出的子载波数量基本不变,且在子载波数量为31个的条件下,平坦度均小于0.15dB.当驱动信号频率为16GHz,平坦度小于0.15dB时,系统输出的多载波光源频谱宽度可达480GHz.此外,分析了MZM的上、下臂偏置电压差、EAM的啁啾因子、调制指数对生成多载波光源的平坦度、子载波数以及频谱宽度的影响.In dense wavelength division multiplexing systems,the light sources are difficult to be synchronized and costly.A structure of multi-carrier light source with good flatness,large number of subcarriers,large spectrum width and adjustable frequency spacing was proposed which can be used in dense wavelength division multiplexing systems.The structure is cascaded with a Mach-Zehnder modulator,an electro-absorption modulator and a phase modulator.In the structure,all the modulators can be driven by a sinusoidal signal to obtain multiple sub-carriers with low flatness and adjustable frequency spacing.When the driving signal frequency is 9 GHz and 12.5 GHz,the number of subcarriers is 31,the flatness of the generated multi-carrier light source can reach 0.09 dB.When the driving signal frequency is turned from 3 GHz to 16 GHz,the number of generated subcarriers is almost unchanged,and the flatness of the subcarriers is always less than 0.15 dB under the condition of 31 subcarriers.And when the driving signal frequency is 16 GHz,the spectrum width of the obtained multi-carrier light source can reach 480 GHz.In addition,the influence of the parameters,such as the upper and lower arm bias voltages of Mach-Zehnder modulator,the chirp factor and the modulation index of electro-absorption modulator,are analyzed with the performance of the system,such as the number of subcarriers,the spectrum width of the generated multi-carrier light source.

关 键 词：光通信 多载波光源 频率间隔可调 外调制器 平坦度 频谱宽度 

分 类 号：TN248.1[电子电信—物理电子学]