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[Influence of polarization maintaining fibers and polarizer on the lightwave spectrum].

The parameters of polarization maintaining fibers and polarizer, and the splicing angles between them have important influence on the spectral characteristics of lightwave propagating in them. The transmission model of lightwave was established using Jones matrix. For the first time, the effect of degree of polarization, fiber lengths, splicing angles between fibers and between fiber and component on the output spectrum was discussed. It was indicated that the shape of output spectrum of the unpolarized lightwave will not change when the splicing angles between fibers and between fiber and component were not zero, while there were periodical functions added to the output spectrum of polarized of partially polarized lightwave. The result that when the angles were constants, the longer the fibers were, the smaller the periods of periodical functions, and that when the fiber lengths were constants, in a certain range the bigger the angles, the larger the amplitudes of periodical functions, was achieved. The conclusions were verified by experiments and they could supply theoretical guidance for the systems using polarization maintaining fibers and polarizer.