Research of modulation characteristics of distributed feedback laser
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摘要: 为了深入了解分布式反馈激光器（DFB）的发光机理与调制特性，通过理论分析和实验对DFB的调谐特性进行了研究。得到FITEL和JDS Uniphase两款激光器调制电流与输出中心波长的对应关系和两种确定系数不同的拟合方程，证明了这两款DFB激光器在实际应用中存在非线性关系。结果表明，FITELFRL15DCWD-A82激光器的3dB带宽与驱动电流幅值关系为3.715pm/mA；该调制结果优化了该激光器的可用相干长度，并验证了驱动信号频率变化不影响3dB光谱宽度。对DFB激光器低频调制特性的定量分析结果可为相干检测系统驱动电路设计提供实验依据。Abstract: In order to understand the luminescence mechanism and modulation characteristics of distributed feedback laser(DFB), the corresponding relationship and fitting equation between modulation current and output central wavelength of FITEL laser and JDS Uniphase laser were obtained through theoretical analysis and experiment. It was proved that two DFB lasers had non-linear relationship in practical application. The results show that the relationship between 3dB bandwidth and the driving current amplitude of FITELFRL15DCWD-A82 laser is 3.715pm/mA. The available coherence length of the laser is optimized by modulation result. It is proved that the frequency change of the driving signal does not affect 3dB spectral width. The research results can provide experimental basis for drive circuit design of a coherent detection system.
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Keywords:
- lasers /
- tuning /
- nonlinearity /
- 3dB bandwidth
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Figure 1. Relationship between center wavelengths and drive current
a—JDSU laser b—FITEL laser
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Figure 3. Diagram of path-modulation non-zero frequency self-beterodyne interferometer
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Figure 5. Modulation spectrum with different drive current amplitudes
a—1mA b—2mA c—3mA d—4mA
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