拉曼光纤放大器及多波长拉曼光纤激光器的研究
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摘要
本论文基于光纤中受激拉曼散射现象的基本原理,围绕拉曼光纤放大器和多波长拉曼光纤激光器展开研究。
提出了基于平均功率分析法的矩阵迭代法,并利用该算法对拉曼光纤放大器进行了仿真。从泵浦源的选择、不同类型增益光纤的影响、噪声随温度的变化情况等几方面对分布式拉曼光纤放大器进行了实验研究。制备了满足WDM系统实际应用要求的分布式拉曼光纤放大器样机,并进行了相关性能参数的测试。传输距离为60公里时,该样机平均开关增益在17.89dB,平均等效噪声指数为-2.6dB,增益平坦度为1.57dB,放大带宽为80nm,平均偏振依赖增益为0.17dB。提出了一种将C波段和L波段的泵浦光沿光纤反向传输的分布式拉曼光纤放大器的结构,减小了泵浦光之间由于拉曼相互作用引起的噪声。
首次提出了一种新型结构的宽带分立式拉曼放大器——宽带双程分立式拉曼光纤放大器,并对其增益、噪声、偏振依赖增益等特性进行了理论及实验研究。结果表明,该新型结构的拉曼光纤放大器极大地提高了增益效率,并抑制了ASE噪声。
首次提出了基于取样光纤光栅的新型多波长拉曼光纤激光器。对取样光栅的特性进行了分析并实际刻写了满足要求的取样光栅。在此基础上,利用该种光栅和拉曼光纤放大器实现了波长间隔分别为100GHz、50GHz以及25GHz的多波长激光输出,满足ITU标准,并具有较好的室温稳定性。此外,对基于可调光纤F-P干涉仪的多波长可调谐拉曼光纤激光器也进行了实验研究,获得了在1530～1610nm的波长范围内可连续调谐的双波长激光输出。
Based on the principle of Stimulated Raman Scattering (SRS) in fiber, the dissertation is focused on the study of Raman fiber amplifiers and multiwavelength Raman fiber lasers.
Based on the theory of average power analysis, a new matrix iterative method for the wideband Raman fiber amplifier was presented. The distributed Raman fiber amplifier was developed, which can be put into practical use in DWDM systems. With 60km transmission distance, it has an average on-off gain of 17.89dB, a average effective noise figure of–2.60dB, a average polarization-dependent gain of 0.17dB, a gain flat of 1.57dB and a amplification bandwidth of 80nm. Besides, a distributed Raman amplifier with a novel pump scheme was studied experimentally.
For the first time, as far as we know, a novel wideband discrete Raman fiber amplifier was presented, which is named as wideband double-pass discrete Raman amplifier. Its characteristics of gain, noise and polarization-dependent gain were studied theoretically and experimentally. The results showed that this configuration could obviously improve the gain efficiency by two or three times.
A multiwavelength Raman fiber laser was presented for the first time, as far as we know. The characteristics of multiwavelength fiber ring laser can be easily controlled by adjusting the parameters of the sampled Bragg grating, including the sampling period and the sampling length. In the proposed fiber laser, stable 4 oscillating wavelengths with 100GHz and 50GHz spacing have been achieved, respectively, as well as 5 oscillating ones with a wavelength spacing of only 25GHz by varying the sampling period of the SBG.. Besides, the multiwavelength Raman laser based on Fabry–Perot etalon was studied experimentally.
提出了基于平均功率分析法的矩阵迭代法,并利用该算法对拉曼光纤放大器进行了仿真。从泵浦源的选择、不同类型增益光纤的影响、噪声随温度的变化情况等几方面对分布式拉曼光纤放大器进行了实验研究。制备了满足WDM系统实际应用要求的分布式拉曼光纤放大器样机,并进行了相关性能参数的测试。传输距离为60公里时,该样机平均开关增益在17.89dB,平均等效噪声指数为-2.6dB,增益平坦度为1.57dB,放大带宽为80nm,平均偏振依赖增益为0.17dB。提出了一种将C波段和L波段的泵浦光沿光纤反向传输的分布式拉曼光纤放大器的结构,减小了泵浦光之间由于拉曼相互作用引起的噪声。
首次提出了一种新型结构的宽带分立式拉曼放大器——宽带双程分立式拉曼光纤放大器,并对其增益、噪声、偏振依赖增益等特性进行了理论及实验研究。结果表明,该新型结构的拉曼光纤放大器极大地提高了增益效率,并抑制了ASE噪声。
首次提出了基于取样光纤光栅的新型多波长拉曼光纤激光器。对取样光栅的特性进行了分析并实际刻写了满足要求的取样光栅。在此基础上,利用该种光栅和拉曼光纤放大器实现了波长间隔分别为100GHz、50GHz以及25GHz的多波长激光输出,满足ITU标准,并具有较好的室温稳定性。此外,对基于可调光纤F-P干涉仪的多波长可调谐拉曼光纤激光器也进行了实验研究,获得了在1530～1610nm的波长范围内可连续调谐的双波长激光输出。
Based on the principle of Stimulated Raman Scattering (SRS) in fiber, the dissertation is focused on the study of Raman fiber amplifiers and multiwavelength Raman fiber lasers.
Based on the theory of average power analysis, a new matrix iterative method for the wideband Raman fiber amplifier was presented. The distributed Raman fiber amplifier was developed, which can be put into practical use in DWDM systems. With 60km transmission distance, it has an average on-off gain of 17.89dB, a average effective noise figure of–2.60dB, a average polarization-dependent gain of 0.17dB, a gain flat of 1.57dB and a amplification bandwidth of 80nm. Besides, a distributed Raman amplifier with a novel pump scheme was studied experimentally.
For the first time, as far as we know, a novel wideband discrete Raman fiber amplifier was presented, which is named as wideband double-pass discrete Raman amplifier. Its characteristics of gain, noise and polarization-dependent gain were studied theoretically and experimentally. The results showed that this configuration could obviously improve the gain efficiency by two or three times.
A multiwavelength Raman fiber laser was presented for the first time, as far as we know. The characteristics of multiwavelength fiber ring laser can be easily controlled by adjusting the parameters of the sampled Bragg grating, including the sampling period and the sampling length. In the proposed fiber laser, stable 4 oscillating wavelengths with 100GHz and 50GHz spacing have been achieved, respectively, as well as 5 oscillating ones with a wavelength spacing of only 25GHz by varying the sampling period of the SBG.. Besides, the multiwavelength Raman laser based on Fabry–Perot etalon was studied experimentally.
引文
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