Highly coherent RF signal generation by heterodyne optical phase locking of external cavity semiconductor lasers

被引：18

作者：

Fan, ZF ^{[1
]}

Heim, PJS

Dagenais, M

机构：

[1] Univ Maryland, Dept Elect Engn, College Pk, MD 20742 USA

[2] Univ Maryland, Joint Program Adv Elect Mat, College Pk, MD 20742 USA

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 1998年 / 10卷 / 05期

关键词：

fiber optics; microwave generation; microwave/millimeter wave; phase-locked loop; RF; semiconductor lasers;

D O I：

10.1109/68.669346

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Two narrow-linewidth (<50 kHz) external cavity semiconductor lasers are successfully offset phase-locked to a reference radio-frequency (RF) signal by using a discriminator-aided optical phase-locked loop. By incorporating a phase advance circuit to increase the loop bandwidth, a highly coherent optically heterodyned RF signal with a total phase variance of 1.19 x 10(-4) rad(2) is demonstrated. The measured noise level is -116 dBc/Hz close to the carrier (200-kHz offset), increases to -110 dBc/Hz at an offset of 5.5 MHz, and then decreases to less than -120 dBc/Hz at offset frequencies larger than 10 MHz.

引用

页码：719 / 721

页数：3

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