Dual-wavelength laser based on saturable absorber and 3 dB ring mirror filter structure
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摘要:
为了提高双波长环形腔激光器的激光输出质量, 将掺铒光纤可饱和吸收体加入3 dB环镜, 构成滤波环, 采用滤波环与输出端耦合器级联实现激光器输出滤波, 并进行了理论分析和实验验证。结果表明, 波长为1554 nm和1562 nm的激光输出带宽分别为0.029 nm和0.038 nm, 双波长峰值波动分别为0.0048 mW和0.0087 mW, 信噪比为55 dB。此基于可饱和吸收体和3 dB环镜滤波器结构的双波长激光器具有更好的线宽压窄特性和稳定性, 可应用于大容量通信和激光治疗等领域。
Abstract:In order to improve the laser output quality of a dual-wavelength annular cavity laser, a saturable absorber of erbium-doped fiber was added to the 3 dB ring mirror to form a filter ring, and the filter ring and the output coupler were cascaded to realize the laser output filtering. Theoretical analysis and experimental verification were carried out. The results show that the laser output bandwidth of 1554 nm and 1562 nm wavelengths are 0.029 nm and 0.038 nm, the peak fluctuations of dual wavelengths are 0.0048 mW and 0.0087 mW, and the signal-to-noise ratio is 55 dB, respectively. The results show that the dual-wavelength laser based on the saturable absorber and 3 dB ring mirror filter structure has better linewidth narrowing characteristics and stability. It can be used in the field of high capacity communication and laser therapy.
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Keywords:
- lasers /
- annular cavity /
- dual wavelength /
- saturable absorber /
- narrow linewidth
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图 6 仿真结果图
a—由OC直接加入EDF-SA的长度对SNR的影响 b—SALMF中EDF-SA长度对SNR及线宽的影响
Figure 6. Simulation results
a—influence of EDF-SA length directly added by OC on SNR b—influence of EDF-SA length on SNR and line width in SALMF
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图 8 不同实验结构输出光谱对比图
Figure 8. Comparison of the output spectra of different experimental structures
表 1 各组实验的SNR与线宽数据
Table 1 SNR and linewidth data of each group
without auxiliary cavity
(control group 1)with EDF-SA loop
(control group 2)with SALFM
(control group 3)with SALFM and EDF-SA loop
(experimental group)1554 nm 1562 nm 1554 nm 1562 nm 1554 nm 1562 nm 1554 nm 1562 nm SNR/dB 60 60 62 61 57 58 55 55 line width/nm 0.141 0.142 0.58 0.58 0.38 0.43 0.29 0.38 
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