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提出一种在光纤寄生偏振耦合测试仪 (DPCA)中调整光束偏振态的方法。通过可旋转半波片的精确调整 ,使振动方向相互垂直的 2束线偏光以 4 5°角通过偏振器。并对如何得到最佳的条纹对比度进行了研究 ,指出在振幅比等于 1时 ,条纹对比度等于 0 .94 3;而振幅比等于 0 .786时 ,取得最佳的条纹对比度 1。
A method of adjusting the polarization state of a light beam in a fiber-optic parasitic polarization coupling tester (DPCA) is proposed. Through the precise adjustment of the rotatable half-wave plate, two linearly polarized light beams whose directions of vibration are perpendicular to each other pass through the polarizer at an angle of 45 °. And how to get the best fringe contrast was studied. It is pointed out that the fringe contrast is equal to 0.943 when the amplitude ratio is equal to 1, and the stripe contrast 1 is obtained when the amplitude ratio equals to 0.786.