Low phase noise microwave extraction from femtosecond laser by frequency conversion pair and IF-domain processing

被引：4

作者：

Dai, Yitang ^{[1
]}

Cen, Qizhuang ^{[1
]}

Wang, Lei ^{[1
]}

Zhou, Yue ^{[1
]}

Yin, Feifei ^{[1
]}

Dai, Jian ^{[1
]}

Li, Jianqiang ^{[1
]}

Xu, Kun ^{[1
,2
]}

机构：

[1] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China

[2] Beijing Univ Posts & Telecommun, Sch Sci, Beijing 100876, Peoples R China

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 25期

关键词：

GENERATION; OSCILLATOR;

D O I：

10.1364/OE.23.031936

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Extraction of a microwave component from a low-time-jitter femtosecond pulse train has been attractive for current generation of spectrally pure microwave. In order to avoid the transfer from the optical amplitude noise to microwave phase noise (AM-PM), we propose to down-convert the target component to intermediate frequency (IF) before the opto-electronic conversion. Due to the much lower carrier frequency, the AM-PM is greatly suppressed. The target is then recovered by up-conversion with the same microwave local oscillation (LO). As long as the time delay of the second LO matches that of the IF carrier, the phase noise of the LO shows no impact on the extraction process. The residual noise of the proposed extraction is analyzed in theory, which is also experimentally demonstrated as averagely around -155 dBc/Hz under offset frequency larger than 1 kHz when 10-GHz tone is extracted from a home-made femtosecond fiber laser. Large tunable extraction from 1 GHz to 10 GHz is also reported. (C) 2015 Optical Society of America

引用

页码：31936 / 31944

页数：9

共 20 条

[1] Microwave phase retardation in saturated InGaAs photodetectors [J].