The superiority of the method is the pectinate filter characteristic, that is, the power ratio of the two output arms changes fast with the Bragg wavelength while in the rising or falling edge of the output spectrum.

• 该方法主要是基于 MZ 干涉仪的梳状滤波特性,即在输出光谱的上升或下降沿两输出臂的功率比值随波长变化很快,通过调整干涉仪臂长差,得到具有陡峭边沿的滤波器。