两节DF B激光器的调谐机理可根据波导光栅反射特性的基本相位和幅度来解释。

The tuning mechanism of two-segment DFB lasers is explained in terms of the fundamental phase and amplitude reflection properties of the waveguide gratings.

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连续相位调制由于其具有恒定包络幅度且对任意的调制信息序列能保持信号的相位连续，从而能够有效的改进信号的频谱特性。

The continuous phase modulation has the constant amplitude and its phase is continuous, which make the signal has a very good power spectrum.

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fir滤波器在保证幅度特性满足技术要求的同时，很容易做到有严格的线性相位特性。

FIR filter in the guarantee range characteristics to meet technical requirements at the same time, very easy to do have the strict linear phase characteristic.

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