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利用沿谐振腔体的一维数值模型着重研究了采用纳米压印技术制作的λ/4相移光栅分布反馈半导体激光器(QPS-DFB-LD)的光谱特性对谐振腔体参数的依赖性。通过将理论计算的结果与实测光谱对照,抽取了用于理论计算的QPS-DFB-LD模型参数。计算结果表明,相移区对中心位置的偏离量较小时(不超过10%)不会对器件的光谱特性造成很大影响,而仅仅是带来微小的蓝移和边模抑制比(SMSR)的变化。而当相移区对中心位置的偏离实际存在时,距离相移区较近的一端光输出功率增大而另一端光输出功率减小,并且距离相移区较近的一端输出光谱SMSR略高。器件两端蒸镀减反膜后所残留的反射率仍会使激射模在一定范围内产生漂移,并使其SMSR产生一定程度上的劣化。
The dependence of the spectral characteristics of QPS-DFB-LD on the resonant cavity parameters is studied emphatically by using the one-dimensional numerical model along resonant cavity. The QPS-DFB-LD model parameters for theoretical calculation were extracted by comparing the results of theoretical calculation with the measured spectra. The calculated results show that the small deviation (less than 10%) from the center position of the phase-shift region will not significantly affect the spectral characteristics of the device, but only bring a small blue-shift and edge-mode rejection ratio (SMSR) The change. When the deviation of the phase shift region from the central position actually exists, the light output power at one end closer to the phase shift region increases and the optical output power decreases at the other end, and the output spectrum SMSR at the end closer to the phase shift region is slightly higher . Residual reflectivity after deposition of the antireflective film on both ends of the device still causes the laser module to drift within a certain range and deteriorate its SMSR to a certain degree.