Tunable and broadband microwave frequency combs based on a semiconductor laser with incoherent optical feedback  

作　　者：赵茂戎 吴正茂 邓涛 周桢力 夏光琼 

机构地区：[1]School of Physical Science and Technology, Southwest University [2]State Key Laboratory of Millimeter Waves, Southeast University

出　　处：《Chinese Physics B》2015年第5期363-368,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61178011,11204248,61475127,and 61275116);the Natural Science Foundation of Chongqing City,China(Grant Nos.2012jj B40011 and 2012jj A40012);the Open Fund of the State Key Lab of Millimeter Waves of China(Grant No.K201418)

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.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.

关 键 词：semiconductor laser incoherent optical feedback microwave frequency combs 

分 类 号：TN248.4[电子电信—物理电子学] TN015