Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Key Laboratory of Navigation and Location Services, Shanghai Institute for Advanced Communication and Data Science, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
We report an 8-channel wavelength-mode optical pulse interleaver on a silicon photonic chip. Wavelength- and mode-division multiplexing techniques are combined to increase the repetition rate of the pulses without adding the complexity of a single dimension. The interleaver uses a cascaded Mach–Zehnder interferometer architecture as a wavelength-division (de)multiplexer, an asymmetric directional coupler as a mode (de)multiplexer, and various lengths of silicon waveguides as delay lines. A pulse sequence with a time interval of 125 ps is implemented with the repetition rate being eight times that of the initial one. The demonstrated wavelength-mode multiplexing approach opens a new route for the generation of high-speed optical pulses.
silicon photonics optical delay line wavelength division multiplexing mode division multiplexing Chinese Optics Letters
2020, 18(3): 031301
上海交通大学区域光纤通信网与新型光通信系统国家重点实验室, 上海 200240
平衡探测器的两输入通路在增益和时延上的不对称会对基于平衡探测的光模数转换(PADC)系统的性能产生影响。建立了基于平衡探测的PADC系统的数学模型，理论上分析了系统有效比特位(ENOB)与平衡探测器两输入通路的增益和时延的不对称性，并仿真分析了增益和时延的不对称对系统ENOB的影响，同时进行了相应的实验验证。结果表明，在相同调制深度下，系统的ENOB随着两输入通路的相对增益和相对时延的增加而减小。当平衡探测器两输入通路在增益和时延上完全一致时，系统的ENOB随着调制深度的增加而逐渐减小；当平衡探测器两输入通路在增益和时延上存在偏差时，系统的ENOB随着调制深度的增加先增大后减小。
信号处理 光模数转换 平衡探测 增益不对称 时延不对称
