基于再生锁模光纤激光器的RZ码光源研究  

Studies of RZ Formats Light Source Based on Regeneratively Mode-locked Fiber Laser

作　　者：贾东方[1] 谈斌[1] 王肇颖[1] 李世忱[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室,天津300072

出　　处：《光电子．激光》2005年第12期1408-1412,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60477022);天津市科技发展基金资助项目(033800411);武汉邮电科学研究院资助项目;天津大学青年教师基金资助项目

摘　　要：进行了再生锁模光纤激光器(RMLFL)在光学归零(RZ)光源应用的实验。通过外接马赫-曾德(M-Z)调制器加伪随机码调制得到良好的背背(back-to-back)测试眼图,获得了可以满足长途传输要求的10 Gbit/s波长可调谐RZ码光源,稳定输出脉宽5 ps,可通过4路复用后升级为40 bit/s RZ光源。同时,将这种RZ码光源与利用两级调制方式产生的RZ码光源作了比较,结果表明,前一种方案在脉宽、信噪比等方面具有明显优势。A reliable return-zero（RZ） formats light source scheme could be realized by modulating a pulse train of chirp-free or low chirp with data signals,where the key component is a stable light source that generates transform-limited pulses. Superior to the con- ventional fiber laser, a regeneratively mode-locked fiber laser （RMLFL） operates steadily against environmental changes,and it could output high repetition pulse train with tunability both in wavelength and duration, which makes it competitive within the field of RZ light sources. In this paper,the application in RZ light source of RMLFL was demonstrated. By u- sing Mach-Zehnder modulator and pseudo-random code modulation,the back-to-back eye- diagrams with good performances were obtained, and RZ format light sources with pulse duration of 5 ps based on RMLFL were realized,which meet the requirements of 10 Gbit/s long haul transission. Furthermore,such a 10 GHz RMLFL could be upgraded to support 40 Gbit/s RZ light sources simply by 4 fold OTDM. At the same time,we compared this RZ light source with the result using two-stage modulation. It is found that the former has more advantaaes in the asoect of oulse duration and sianal-noise-ration.

关 键 词：光学归零(RZ)码光源 再生锁模光纤激光器(RMLFL) 两级调制 

分 类 号：TN253[电子电信—物理电子学]