可调谐掺铒光纤激光器与多波长光纤激光器的研究
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摘要
可调谐激光器和多波长激光器是密集波分复用(DWDM)传输系统的核心技术。本论文主要围绕可调谐掺铒光纤激光器和多波长光纤激光器进行了以下几方面的实验研究:
一、EDFA泵浦半导体激光器驱动电源的研制
1.设计了两种全模拟的双可变恒流源串联驱动半导体激光器电路。由于采用了二个恒流源串联创新型方案并加之状态指示等辅助措施后,即使其中一个损坏(短路),也不影响半导体激光器正常工作,形似双保险。不仅省去了高难度的高速保护电路,还保证了安全运行。
二、可调谐掺铒光纤激光器的研究
1. L波段掺铒光纤放大器(EDFA)的设计。采用了两级级连的结构设计了L波段的EDFA,并且得到了平坦度很好的ASE谱,其3dB带宽约为40nm。
2.基于可调谐F-P滤波器的L带连续可调谐掺铒光纤激光器的实验研究。实现了在1574.56～1607.60nm的波长范围内的单线可调谐输出。
3.基于高双折射光纤环形镜(Hi-Bi FLM)的离散式L带可调谐掺铒光纤激光器的实验研究。实现了L波段频率间隔为100GHz的41个离散可调谐波长的可调谐输出。
三、多波长光纤激光器的研究
1.基于高双折射光纤环形镜的多波长半导体光纤环形激光器(SFRL)的实验研究。利用高双折射光纤环形镜作为梳状滤波器放置在由半导体光放大器(SOA)构成的环形腔光纤激光器内,得到了频率间隔为100GHz的17个波长的输出。通过调整激光腔内的偏振控制器,实现了这组波长在50GHz范围内的整体连续可调谐。
Tunable laser and multiwavelength laser are key components in dense wavelength division multiplexing(DWDM) transmission systems. This dissertation is focused on tunable erbium-doped fiber laser(EDFL) and multiwavelength fiber laser, which include:
1. The development of laser diode(LD) power
1)Based on analog circuits, two LD power circuits with dual-switchable constant current sources in series are designed. The damage to the expensive LD caused by the sudden invalidation of one source can be avoided, thus saving the complex high speed protection circuit.
2. Research on tunable EDFL
1)A L-band erbium-doped fiber amplifier(EDFA) is designed in dual-stage. Gain-flattened amplified spontaneous emission(ASE) is obtained. And the 3dB bandwidth is about 40nm.
2)A wavelength-tunable erbium-doped fiber laser in L band based on a tunable F-P filter is demonstrated. Single frequency laser can be tuned from 1574.56 to 1607.60nm.
3)A wavelength-selectable discretely tunable erbium-doped fiber laser in L band is demonstrated by using a high birefringence fiber loop mirror(Hi-Bi FLM) as a precise multiwavelength grid filter. With a Hi-Bi FLM and an L-band channel-selecting tunable filter, 41 wavelengths spacing on 100GHz are obtained.
3. Research on multiwavelength fiber laser
1)We propose a novel switchable multiwavelength fiber ring laser base on SOA, which uses a Hi-Bi FLM as a filter. Simultaneous lasing of 17 wavelengths spacing on 100GHz are obtained. By adjusting the states of polarization controller(PC), these 17wavelengths can be tuned together over 50GHz.
一、EDFA泵浦半导体激光器驱动电源的研制
1.设计了两种全模拟的双可变恒流源串联驱动半导体激光器电路。由于采用了二个恒流源串联创新型方案并加之状态指示等辅助措施后,即使其中一个损坏(短路),也不影响半导体激光器正常工作,形似双保险。不仅省去了高难度的高速保护电路,还保证了安全运行。
二、可调谐掺铒光纤激光器的研究
1. L波段掺铒光纤放大器(EDFA)的设计。采用了两级级连的结构设计了L波段的EDFA,并且得到了平坦度很好的ASE谱,其3dB带宽约为40nm。
2.基于可调谐F-P滤波器的L带连续可调谐掺铒光纤激光器的实验研究。实现了在1574.56～1607.60nm的波长范围内的单线可调谐输出。
3.基于高双折射光纤环形镜(Hi-Bi FLM)的离散式L带可调谐掺铒光纤激光器的实验研究。实现了L波段频率间隔为100GHz的41个离散可调谐波长的可调谐输出。
三、多波长光纤激光器的研究
1.基于高双折射光纤环形镜的多波长半导体光纤环形激光器(SFRL)的实验研究。利用高双折射光纤环形镜作为梳状滤波器放置在由半导体光放大器(SOA)构成的环形腔光纤激光器内,得到了频率间隔为100GHz的17个波长的输出。通过调整激光腔内的偏振控制器,实现了这组波长在50GHz范围内的整体连续可调谐。
Tunable laser and multiwavelength laser are key components in dense wavelength division multiplexing(DWDM) transmission systems. This dissertation is focused on tunable erbium-doped fiber laser(EDFL) and multiwavelength fiber laser, which include:
1. The development of laser diode(LD) power
1)Based on analog circuits, two LD power circuits with dual-switchable constant current sources in series are designed. The damage to the expensive LD caused by the sudden invalidation of one source can be avoided, thus saving the complex high speed protection circuit.
2. Research on tunable EDFL
1)A L-band erbium-doped fiber amplifier(EDFA) is designed in dual-stage. Gain-flattened amplified spontaneous emission(ASE) is obtained. And the 3dB bandwidth is about 40nm.
2)A wavelength-tunable erbium-doped fiber laser in L band based on a tunable F-P filter is demonstrated. Single frequency laser can be tuned from 1574.56 to 1607.60nm.
3)A wavelength-selectable discretely tunable erbium-doped fiber laser in L band is demonstrated by using a high birefringence fiber loop mirror(Hi-Bi FLM) as a precise multiwavelength grid filter. With a Hi-Bi FLM and an L-band channel-selecting tunable filter, 41 wavelengths spacing on 100GHz are obtained.
3. Research on multiwavelength fiber laser
1)We propose a novel switchable multiwavelength fiber ring laser base on SOA, which uses a Hi-Bi FLM as a filter. Simultaneous lasing of 17 wavelengths spacing on 100GHz are obtained. By adjusting the states of polarization controller(PC), these 17wavelengths can be tuned together over 50GHz.
引文
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[13]董新永,赵春柳,董孝义等,可调谐光纤环形腔激光器输出特性的理论和实验研究,物理学报,2002,Vol51,2750～2755
[14]Reeves-Hall, P.C. and Taylor, J.R. Wavelength tunable CW Raman fibre ring laser operating at 1486～1551 nm, Electronics Letters , 2001 ,37(8):491～492
[15]D. K. Serkland and P. Kumar, Tunable fiber-optic parametric oscillator, Optics Letters, 1999,24(2):92～94
[16]M. L. Nielsen, M. Nord, M. N. Petersen et al., 40Gbit/s standard-mode wavelength conversion in all-active MZI with very fast response, IEEE Electron. Lett., 2003, 39(4): 385~386
[17]T. Papakyriakopoilos, A. Stavdas, E. N. Protomotarios et al., 10×10 GHz Simultaneously modelocked multiwavelength fiber ring laser, IEEE Electron. Lett., 1999, 35(9):717~718
[18]H. Shi, G. A. Alphonse, J. C. Connolly et al., 20×5 Gbit/s optical WDM transmitter using single-stripe multiwavelength modelocked semiconductor laser, IEEE Electron. Lett., 1998, 34(2):179~181
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[20]J. -N. Maran, S. LaRochelle, C. Juignet et al., An actively-modelocked erbium-doped fiber laser emitting over 30 wavelength simultaneously with a 5GHz repetition rate, ECOC’03,Paper We267
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