中国物理B ›› 2015, Vol. 24 ›› Issue (5): 54207-054207.doi: 10.1088/1674-1056/24/5/054207
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
赵茂戎a, 吴正茂a, 邓涛a, 周桢力a, 夏光琼a b
Zhao Mao-Rong (赵茂戎)a, Wu Zheng-Mao (吴正茂)a, Deng Tao (邓涛)a, Zhou Zhen-Li (周桢力)a, Xia Guang-Qiong (夏光琼)a b
摘要:
Based on a semiconductor laser (SL) with incoherent optical feedback, a novel all-optical scheme for generating tunable and broadband microwave frequency combs (MFCs) is proposed and investigated numerically. The results show that, under suitable operation parameters, the SL with incoherent optical feedback can be driven to operate at a regular pulsing state, and the generated MFCs have bandwidths broader than 40 GHz within a 10 dB amplitude variation. For a fixed bias current, the line spacing (or repetition frequency) of the MFCs can be easily tuned by varying the feedback delay time and the feedback strength, and the tuning range of the line spacing increases with the increase in the bias current. The linewidth of the MFCs is sensitive to the variation of the feedback delay time and the feedback strength, and a linewidth of tens of KHz can be achieved through finely adjusting the feedback delay time and the feedback strength. In addition, mappings of amplitude variation, repetition frequency, and linewidth of MFCs in the parameter space of the feedback delay time and the feedback strength are presented.
中图分类号: (Semiconductor lasers; laser diodes)