掺铥光纤放大器的研究
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摘要
随着光纤通信技术的发展,特别是WDM/DWDM技术的日趋成熟,对于S波段及S+波段(1450nm～1520nm)光放大的需求日渐升高,而Tm~(3+)的能级结构中存在满足S波段及S+波段光放大的能级跃迁。虽然铥离子的能级结构十分复杂,但是掺铥光纤放大器(TDFA)是S波段及S+波段最具潜力的激光放大器件之一,对于光纤通信系统的通信窗口向S波段及S+波段拓展具有十分重要的意义和价值。所以掺铥光纤放大器已经成为光纤通信器件新的研究热点之一。
本论文重点对掺铥光纤放大器泵浦源激光器的输出光场强度分布以及经过单透镜和双透镜耦合后的光场强度分布进行了分析、仿真和比较;基于速率方程和传输方程分析了掺铥光纤放大器的性能,建立了数学模型并进行了大量模拟仿真,其主要工作和创新点如下:
1.概述铥元素的能级结构特点,对其光谱特性、掺铥光纤放大器的研究现状以及掺铥光纤放大器的系统组成结构进行了介绍,在此基础上对掺铥光纤放大器的泵浦方式进行了总结和比较。
2.研究了掺铥光纤放大器泵浦源激光器的输出光场强度分布,在此基础上理论推导了泵浦源激光器输出光束经过单透镜和双透镜耦合后的光场强度分布,根据理论分析结果进行了仿真并对仿真结果进行了分析和比较。结果表明,双透镜耦合后输出光束不会因为传输距离过大而导致光束分离,在相同的前提条件下双透镜耦合后输出光束的半径要远小于单透镜,即双透镜的耦合效果明显优于单透镜。
3.基于速率方程和传输方程对掺铥光纤放大器的泵浦方案进行了理论分析,建立了掺铥光纤放大器泵浦方案的数学模型,并求解了相应的数学方程,根据求解结果讨论了数学模型中各参数对掺铥光纤放大器性能的影响。
4.分别模拟仿真了氟化物玻璃和碲酸盐玻璃掺铥光纤放大器的输出信号增益特性,详细研究和分析了铥离子的掺杂浓度、光纤长度、泵浦功率等参数对放大器的输出信号增益特性的影响。仿真结果表明掺铥光纤放大器中,光纤长度、掺杂浓度和泵浦功率三者之间存在着匹配关系。当输出信号增益一定时,在相同光纤长度条件下,掺杂浓度越高,所需泵浦功率越低;在相同掺杂浓度条件下,泵浦功率越高,所需的光纤长度越短;在相同泵浦功率条件下,掺杂浓度越高,所需的光纤长度越短。
The demand of the S-band optical amplification is rapidly increasing with the development of optical communication technology,particularly the rapid development of WDM/DWDM.The energy structure in Tm~(3+)exist the transition which can meet the S-band and S+-band.Although the energy structure of thulium ions are very complex,thulium-doped fiber amplifier(TDFA) is the most important device for the S-band and S+-band optical amplification,and its research will be very significant for the further broadening the optical communication bandwidth.Thulium-doped fiber amplifiers have become new hot spot of optical fiber communication devices.
In this paper,we mainly do some analysis,simulation and comparison about the semiconductor laser multi-core pigtail outputting light field intensity,as well as the outputting light field intensity distribution of LD multi-core pigtail single-lens and dual-lens coupled.We analyze thulium-doped fiber amplifier performance based on the rate equation and the transfer equation and do a lot of simulations.The major and innovational work is as follows:
1.Overview the level structural features of elements of the thulium,introduce its spectral characteristics and the research status as well as the system structure of thulium-doped fiber amplifier.Based on those work,some summarize and comparisons about the comparison of pumping schemes of TDFA are did.
2.Study the thulium-doped fiber amplifier pumping source laser outputting light field intensity distribution.The outputting light field intensity distribution of LD multi-core pigtail single-lens and dual-lens coupled are analyzed and simulated after those work.The results show that large transmission distance will not lead to outputting beam separation when use dual-lens to coupled.In the same prerequisite,outputting beam radius is much smaller than single-lens after the dual-lens coupled.Dual-lens coupling effect is much better than single-lens.
3.Use the method of rate equation and transfer equation to analyze the pump scheme of thulium-doped fiber amplifier.Mathematical model of pump scheme of thulium-doped fiber amplifier is set up,the parameters is also discussed under this model.
4.The fluoride glass and tellurite glass thulium-doped fiber amplifier output signal gain characteristics are simulated respectively.Influence of the thulium ion doping concentration,fiber length,pumping power is detail studide and analyzed.The results show that there is a kind of match relationship among those three parameters.When outputting signal gain is a constant,the higher doping concentration,the lower the pumping power is required under a certain length of fiber;the higher pumping power, the shorter fiber length is required under a certain doping concentration;the higher doping concentration,the shorter fiber length is required under a certain pumping power.
本论文重点对掺铥光纤放大器泵浦源激光器的输出光场强度分布以及经过单透镜和双透镜耦合后的光场强度分布进行了分析、仿真和比较;基于速率方程和传输方程分析了掺铥光纤放大器的性能,建立了数学模型并进行了大量模拟仿真,其主要工作和创新点如下:
1.概述铥元素的能级结构特点,对其光谱特性、掺铥光纤放大器的研究现状以及掺铥光纤放大器的系统组成结构进行了介绍,在此基础上对掺铥光纤放大器的泵浦方式进行了总结和比较。
2.研究了掺铥光纤放大器泵浦源激光器的输出光场强度分布,在此基础上理论推导了泵浦源激光器输出光束经过单透镜和双透镜耦合后的光场强度分布,根据理论分析结果进行了仿真并对仿真结果进行了分析和比较。结果表明,双透镜耦合后输出光束不会因为传输距离过大而导致光束分离,在相同的前提条件下双透镜耦合后输出光束的半径要远小于单透镜,即双透镜的耦合效果明显优于单透镜。
3.基于速率方程和传输方程对掺铥光纤放大器的泵浦方案进行了理论分析,建立了掺铥光纤放大器泵浦方案的数学模型,并求解了相应的数学方程,根据求解结果讨论了数学模型中各参数对掺铥光纤放大器性能的影响。
4.分别模拟仿真了氟化物玻璃和碲酸盐玻璃掺铥光纤放大器的输出信号增益特性,详细研究和分析了铥离子的掺杂浓度、光纤长度、泵浦功率等参数对放大器的输出信号增益特性的影响。仿真结果表明掺铥光纤放大器中,光纤长度、掺杂浓度和泵浦功率三者之间存在着匹配关系。当输出信号增益一定时,在相同光纤长度条件下,掺杂浓度越高,所需泵浦功率越低;在相同掺杂浓度条件下,泵浦功率越高,所需的光纤长度越短;在相同泵浦功率条件下,掺杂浓度越高,所需的光纤长度越短。
The demand of the S-band optical amplification is rapidly increasing with the development of optical communication technology,particularly the rapid development of WDM/DWDM.The energy structure in Tm~(3+)exist the transition which can meet the S-band and S+-band.Although the energy structure of thulium ions are very complex,thulium-doped fiber amplifier(TDFA) is the most important device for the S-band and S+-band optical amplification,and its research will be very significant for the further broadening the optical communication bandwidth.Thulium-doped fiber amplifiers have become new hot spot of optical fiber communication devices.
In this paper,we mainly do some analysis,simulation and comparison about the semiconductor laser multi-core pigtail outputting light field intensity,as well as the outputting light field intensity distribution of LD multi-core pigtail single-lens and dual-lens coupled.We analyze thulium-doped fiber amplifier performance based on the rate equation and the transfer equation and do a lot of simulations.The major and innovational work is as follows:
1.Overview the level structural features of elements of the thulium,introduce its spectral characteristics and the research status as well as the system structure of thulium-doped fiber amplifier.Based on those work,some summarize and comparisons about the comparison of pumping schemes of TDFA are did.
2.Study the thulium-doped fiber amplifier pumping source laser outputting light field intensity distribution.The outputting light field intensity distribution of LD multi-core pigtail single-lens and dual-lens coupled are analyzed and simulated after those work.The results show that large transmission distance will not lead to outputting beam separation when use dual-lens to coupled.In the same prerequisite,outputting beam radius is much smaller than single-lens after the dual-lens coupled.Dual-lens coupling effect is much better than single-lens.
3.Use the method of rate equation and transfer equation to analyze the pump scheme of thulium-doped fiber amplifier.Mathematical model of pump scheme of thulium-doped fiber amplifier is set up,the parameters is also discussed under this model.
4.The fluoride glass and tellurite glass thulium-doped fiber amplifier output signal gain characteristics are simulated respectively.Influence of the thulium ion doping concentration,fiber length,pumping power is detail studide and analyzed.The results show that there is a kind of match relationship among those three parameters.When outputting signal gain is a constant,the higher doping concentration,the lower the pumping power is required under a certain length of fiber;the higher pumping power, the shorter fiber length is required under a certain doping concentration;the higher doping concentration,the shorter fiber length is required under a certain pumping power.
引文
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