The positioning principle of double - wavelength interferometer, the problems met in designing and manufacturing of CPLD functional circuits and the solving methods are described in the paper.
阐述了双频干涉仪的定位原理，以及在应用CPLD设计、制作其功能电路时遇到的问题和解决方案。
Two arms of the interferometer are different in length by one -quarter of a guide wavelength, allowing the device to operate at its optimal linearity point without external electrical bias.
干涉仪的两个臂长相差波导波长的四分之一，使器件在最佳线性点工作，无需外加电偏压。
It is noteworthy that the wavelength of the fiber Bragg grating would be tuned via only a phase mask in a phase mask interferometer.
值得注意的是在相位干涉法中，只用一块相位模板，就可以调整写入光纤布拉格光栅的波长。
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