基于特种光纤滤波器的光纤激光器研究
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摘要
高性能的单波长、双波长和多波长光纤激光器在高速大容量的光通信系统、光载无线通信系统、相干光通信系统及光传感网络等领域具有广泛的应用前景。而性能好、稳定性高、成本低、制作容易且易于集成的光纤滤波器,是高性能的单波长、双波长和多波长光纤激光器中的关键器件。本论文结合国家自然科学基金项目和北京交通大学优秀博士生科技创新基金项目,以新型光纤滤波器研究为突破口,对基于特种光纤的几种新型滤波器开展深入的理论和实验研究,并基于研制的几种新型的滤波器,进行了单波长、双波长和多波长光纤激光器结构的设计与优化,取得的主要创新性成果如下：
1.提出了基于不对称双芯光纤的双通道M-Z干涉型滤波器(DPMZI-ATCF),旨在提高双波长激光器的性能。应用传输特性法建立了滤波器的分析模型,理论和实验相结合,研究了滤波器的反射谱特性,获得具有相同波长间隔和不同反射率的梳状谱。基于该滤波器设计并实验制作了一种单双波长可切换的掺铒光纤激光器,获得了边模抑制比大于62.47dB、波长间隔在0.155nm～4.041nm可调的双波长激光输出。该激光器为微波光子学的光生毫米波技术提供了一个较理想的光源。
2.基于保偏光纤的双通道M-Z干涉仪滤波器(DPMZI-PMF),提出并实验研制了一种单双波长可切换的掺铒光纤激光器结构。通过调整偏振控制器,获得了单双波长可切换激光输出,单波长激光3dB线宽为0.0146nm,边模抑制比高达69.55dB,而双波长激光边模抑制比大于64.0dB,可调谐的波长间隔范围得到进一步拓展,最小波长间隔降低到为0.084nnm,最大波长间隔增加到4.28nm。
3.提出并实验制作一种单双波长可切换和可调谐掺铒光纤激光器。采用透射型环形滤波器(TRT)/反射型环形滤波器(RRT)和DPMZI-PMF滤波器组合而成的复合滤波器。通过调整偏振控制器,实现单双波长可切换和可调谐激光输出。单、双波长分别在1561.03nm～1569.16nm和1563.57nm～1568.88nm宽范围内可调,同时,双波长的波长间隔在0.01nm～4.34nm范围内可调谐,而且双波长激光峰值功率具有均衡性。和其他方法相比,实现具有相同峰值功率输出的双波长激光。该结构激光器输出稳定、易于控制、较低成本等优点。
4.提出并研制出一种基于复合滤波器的具有高边模抑制比的稳定可调的单波长掺铒光纤激光器。采用高精细光纤(HF-F)滤波器和DPMZI-PMF滤波器组成的复合滤波器,实现线偏振的边模抑制比高达72.11dB的单波长激光输出,而且输出激光波长在1560.37nm到1568.56nm范围内可调谐。该激光器在光通信系统、长距离光传感网络及光测量等领域具有很好的应用前景。
5.提出了基于非线性旋转效应(NPR)稳定可切换的线型腔多波长光纤激光器。采用搭建对称的非线性环镜产生的NPR效应,有效地抑制了掺铒光纤中的均匀展宽效应,结合不对称双芯光纤(ATCF)滤波器作为波长选择器,实现多达52个波长、平均消光比为32dB的多波长激光输出。该激光器可以作为密集波分复用系统的多信道的理想光源。
6.基于ATCF滤波器,提出了基于复合物理机制的稳定可切换的多波长光纤激光器。通过引入NPR效应和偏振依赖损耗效应-复合物理机制,使得掺铒光纤中均匀展宽得到有效的控制,从而抑制模式竞争和模式跳变。实现平均信噪比高达41.5dB波长数为45个多波长激光输出。为密集波分复用系统及大容量光传感网中提供一个高效的光源。
Single-wavelength, dual-wavelength and multi-wavelength fiber lasers with high performance have broad application prospects in the field of high-speed large-capacity optical communication systems, Radio Over Fiber systems, coherent optical communication systems and optical sensing networks. And the good performance, high stability, low cost, easy to manufacture and easy to integrate fiber filter, is a key devices for single-wavelength, dual-wavelength and multi-wavelength fiber laser with high-performance. In this paper, with the help of the National Natural Science Foundation of China and Beijing Jiao tong University Outstanding doctoral student of science and technology innovation fund projects, to study the novel fiber filters for breakthrough, several novel fiber filters based on special fiber are conducted in-depth theoretical and experimental research, and the structure and performance of single-wavelength, dual-wavelength, and multi-wavelength fiber laser based on research several novel filters were designed and optimized, respectively. The main innovative results obtained are as follows:
1. The dual channel MZ interferometer filter based on asymmetric twin-core fiber (DPMZI-ATCF) was proposed and designed to improve the performance of dual-wavelength lasers. The model of the DPMZI-ATCF was established by a transfer matrix method. By combining theories and experiment, the reflection spectrum characteristics of the filter was studied. a comb spectrum with the same wavelength intervals and different reflectivity was obtain. a single or double switch switchable wavelength erbium-doped fiber laser (EDFL) was designed and fabricated using the filter experimentally. The side mode suppression ratio greater than62.47dB of the dual-wavelength fiber laser was achieved, and wavelength interval was tuned from0.155nm to4.041nm. The laser as Photo-millimeter wave technology microwave photonics offers students an ideal light source.
2. The dual-pass MZ interferometer filter based on dual polarization maintaining fiber (DPMZI-PMF) was proposed. A single or double switchable wavelength EDFL was designed and fabricated using the filter experimentally. By adjusting the polarization controllers (PCs), the single-and double-wavelength laser output was switched, the single-wavelength laser with3dB line-width0.0146nm, and side mode suppression ratio(SMSR) up to69.55dB was obtained, while the SMSR of the dual-wavelength laser was greater than64.0dB, wavelength tunable interval range has been further expanded, the minimum wavelength spacing was reduced to0.084nm, the maximum wavelength interval was added to4.28nm.
3. The single-and dual-wavelength switching and wavelength EDFL was proposed and fabricated in experiment. A composite filter was made of a transmission type loop filter (TRT)/reflective type loop filter (RRT) and the DPMZI-PMF filter. By adjusting the PCs and using the filter, single and double switches and tunable wavelength laser output were obtained separately. Single and dual wavelength were adjusted in the wide range from1561.03nm to1569.16nm and1563.57nm to1568.88nm respectively, while the dual-wavelength spacing was tuned from0.01nm to4.34nm, and the dual-wavelength laser possessed a peak power balance. Compared with other methods, to achieve the same peak power output of the dual-wavelength laser. The laser had advantages of output wavelength stability, easy to control, and low cost.
4. A stable and tunable single wavelength EDFL with high SMSR based on a compounded fiber filter, which was composed of high-precision optical fiber (HF-F) filter and DPMZI-PMF filter, was proposed and fabricated. A single-wavelength laser with linearly polarization and SMSR as high as72.11dB was achieved, and The output laser wavelength was tunable in the range of1560.37nm to1568.56nm. The laser had a good prospect in the field of optical communication systems, long distance optical sensor networks and optical measurements.
5. A stable switchable multi-wavelength linear cavity fiber lasers was presented based on nonlinear rotational effects (NPR). By using non-linear loop mirror symmetrical structures, the NPR effects, which effectively suppressed homogeneous broadening effect in erbium-doped fiber. Using asymmetric twin-core fiber (ATCF) as a wavelength selection filter, up to52lasing wavelengths with signal noise ratio (SNR)of more than32dB was achieved. The mulitiwavelength fiber laser could be used as a multi-channel DWDM system ideal source.
6. Using ATCF filter, a switched multi-wavelength fiber laser was proposed based on a stable complex physical mechanisms. By introducing NPR effects and polarization dependent loss effects-complex physical mechanisms, the homogeneous broadening effect in erbium-doped fiber had been effectively controlled, thereby mode competition and mode hopping had also been suppressed.45lasing wavelengths with a SNR up to41.5dB was obtained. The mulitiwavelength fiber laser provided an efficient source for high-capacity dense wavelength division multiplexing systems and optical sensing networks.
1.提出了基于不对称双芯光纤的双通道M-Z干涉型滤波器(DPMZI-ATCF),旨在提高双波长激光器的性能。应用传输特性法建立了滤波器的分析模型,理论和实验相结合,研究了滤波器的反射谱特性,获得具有相同波长间隔和不同反射率的梳状谱。基于该滤波器设计并实验制作了一种单双波长可切换的掺铒光纤激光器,获得了边模抑制比大于62.47dB、波长间隔在0.155nm～4.041nm可调的双波长激光输出。该激光器为微波光子学的光生毫米波技术提供了一个较理想的光源。
2.基于保偏光纤的双通道M-Z干涉仪滤波器(DPMZI-PMF),提出并实验研制了一种单双波长可切换的掺铒光纤激光器结构。通过调整偏振控制器,获得了单双波长可切换激光输出,单波长激光3dB线宽为0.0146nm,边模抑制比高达69.55dB,而双波长激光边模抑制比大于64.0dB,可调谐的波长间隔范围得到进一步拓展,最小波长间隔降低到为0.084nnm,最大波长间隔增加到4.28nm。
3.提出并实验制作一种单双波长可切换和可调谐掺铒光纤激光器。采用透射型环形滤波器(TRT)/反射型环形滤波器(RRT)和DPMZI-PMF滤波器组合而成的复合滤波器。通过调整偏振控制器,实现单双波长可切换和可调谐激光输出。单、双波长分别在1561.03nm～1569.16nm和1563.57nm～1568.88nm宽范围内可调,同时,双波长的波长间隔在0.01nm～4.34nm范围内可调谐,而且双波长激光峰值功率具有均衡性。和其他方法相比,实现具有相同峰值功率输出的双波长激光。该结构激光器输出稳定、易于控制、较低成本等优点。
4.提出并研制出一种基于复合滤波器的具有高边模抑制比的稳定可调的单波长掺铒光纤激光器。采用高精细光纤(HF-F)滤波器和DPMZI-PMF滤波器组成的复合滤波器,实现线偏振的边模抑制比高达72.11dB的单波长激光输出,而且输出激光波长在1560.37nm到1568.56nm范围内可调谐。该激光器在光通信系统、长距离光传感网络及光测量等领域具有很好的应用前景。
5.提出了基于非线性旋转效应(NPR)稳定可切换的线型腔多波长光纤激光器。采用搭建对称的非线性环镜产生的NPR效应,有效地抑制了掺铒光纤中的均匀展宽效应,结合不对称双芯光纤(ATCF)滤波器作为波长选择器,实现多达52个波长、平均消光比为32dB的多波长激光输出。该激光器可以作为密集波分复用系统的多信道的理想光源。
6.基于ATCF滤波器,提出了基于复合物理机制的稳定可切换的多波长光纤激光器。通过引入NPR效应和偏振依赖损耗效应-复合物理机制,使得掺铒光纤中均匀展宽得到有效的控制,从而抑制模式竞争和模式跳变。实现平均信噪比高达41.5dB波长数为45个多波长激光输出。为密集波分复用系统及大容量光传感网中提供一个高效的光源。
Single-wavelength, dual-wavelength and multi-wavelength fiber lasers with high performance have broad application prospects in the field of high-speed large-capacity optical communication systems, Radio Over Fiber systems, coherent optical communication systems and optical sensing networks. And the good performance, high stability, low cost, easy to manufacture and easy to integrate fiber filter, is a key devices for single-wavelength, dual-wavelength and multi-wavelength fiber laser with high-performance. In this paper, with the help of the National Natural Science Foundation of China and Beijing Jiao tong University Outstanding doctoral student of science and technology innovation fund projects, to study the novel fiber filters for breakthrough, several novel fiber filters based on special fiber are conducted in-depth theoretical and experimental research, and the structure and performance of single-wavelength, dual-wavelength, and multi-wavelength fiber laser based on research several novel filters were designed and optimized, respectively. The main innovative results obtained are as follows:
1. The dual channel MZ interferometer filter based on asymmetric twin-core fiber (DPMZI-ATCF) was proposed and designed to improve the performance of dual-wavelength lasers. The model of the DPMZI-ATCF was established by a transfer matrix method. By combining theories and experiment, the reflection spectrum characteristics of the filter was studied. a comb spectrum with the same wavelength intervals and different reflectivity was obtain. a single or double switch switchable wavelength erbium-doped fiber laser (EDFL) was designed and fabricated using the filter experimentally. The side mode suppression ratio greater than62.47dB of the dual-wavelength fiber laser was achieved, and wavelength interval was tuned from0.155nm to4.041nm. The laser as Photo-millimeter wave technology microwave photonics offers students an ideal light source.
2. The dual-pass MZ interferometer filter based on dual polarization maintaining fiber (DPMZI-PMF) was proposed. A single or double switchable wavelength EDFL was designed and fabricated using the filter experimentally. By adjusting the polarization controllers (PCs), the single-and double-wavelength laser output was switched, the single-wavelength laser with3dB line-width0.0146nm, and side mode suppression ratio(SMSR) up to69.55dB was obtained, while the SMSR of the dual-wavelength laser was greater than64.0dB, wavelength tunable interval range has been further expanded, the minimum wavelength spacing was reduced to0.084nm, the maximum wavelength interval was added to4.28nm.
3. The single-and dual-wavelength switching and wavelength EDFL was proposed and fabricated in experiment. A composite filter was made of a transmission type loop filter (TRT)/reflective type loop filter (RRT) and the DPMZI-PMF filter. By adjusting the PCs and using the filter, single and double switches and tunable wavelength laser output were obtained separately. Single and dual wavelength were adjusted in the wide range from1561.03nm to1569.16nm and1563.57nm to1568.88nm respectively, while the dual-wavelength spacing was tuned from0.01nm to4.34nm, and the dual-wavelength laser possessed a peak power balance. Compared with other methods, to achieve the same peak power output of the dual-wavelength laser. The laser had advantages of output wavelength stability, easy to control, and low cost.
4. A stable and tunable single wavelength EDFL with high SMSR based on a compounded fiber filter, which was composed of high-precision optical fiber (HF-F) filter and DPMZI-PMF filter, was proposed and fabricated. A single-wavelength laser with linearly polarization and SMSR as high as72.11dB was achieved, and The output laser wavelength was tunable in the range of1560.37nm to1568.56nm. The laser had a good prospect in the field of optical communication systems, long distance optical sensor networks and optical measurements.
5. A stable switchable multi-wavelength linear cavity fiber lasers was presented based on nonlinear rotational effects (NPR). By using non-linear loop mirror symmetrical structures, the NPR effects, which effectively suppressed homogeneous broadening effect in erbium-doped fiber. Using asymmetric twin-core fiber (ATCF) as a wavelength selection filter, up to52lasing wavelengths with signal noise ratio (SNR)of more than32dB was achieved. The mulitiwavelength fiber laser could be used as a multi-channel DWDM system ideal source.
6. Using ATCF filter, a switched multi-wavelength fiber laser was proposed based on a stable complex physical mechanisms. By introducing NPR effects and polarization dependent loss effects-complex physical mechanisms, the homogeneous broadening effect in erbium-doped fiber had been effectively controlled, thereby mode competition and mode hopping had also been suppressed.45lasing wavelengths with a SNR up to41.5dB was obtained. The mulitiwavelength fiber laser provided an efficient source for high-capacity dense wavelength division multiplexing systems and optical sensing networks.
引文
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