title: Study of the characteristics of single-mode birefringent fibers
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: ÐÐ·ÑÑÐµÐ½Ð¸Ðµ Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÐ¾Ð² Ð¾Ð´Ð½Ð¾Ð¼Ð¾Ð´Ð¾Ð²ÑÑ Ð´Ð²ÑÐ»ÑÑÐµÐ¿ÑÐµÐ»Ð¾Ð¼Ð»ÑÑÑÐ¸Ñ Ð²Ð¾Ð»Ð¾ÐºÐ¾Ð½
Creators: name: ÐÐ°Ð¾ Ð¨ÑÐ½Ñ Ð°Ð½Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: ÐÐ°ÑÑÐ¸ÐºÐ¸ Ð²Ð¾Ð»Ð¾ÐºÐ¾Ð½Ð½Ð¾-Ð¾Ð¿ÑÐ¸ÑÐµÑÐºÐ¸Ðµ
ÐÐ¾Ð»Ð¾ÐºÐ¾Ð½Ð½Ð°Ñ Ð¾Ð¿ÑÐ¸ÐºÐ°
birefringence
birefringent fiber
single mode fiber
polarization-maintaining fiber
panda-type polarization-maintaining fiber
beat length
state of polarization
polarization dispersion
stress-optical effect

description: Single-mode optical fibers have possibility save the state of polarization and often are applying in the fiber physical sensors and optical fiber communication. One of the most impotent parameters of such fibers is beat length. The subject of the graduate qualification work is Methods for measuring the beat length of single-mode optical fibers with linear birefringence. The main attention from different measuring methods is devoted to spectral method with frequency scanning coherent laser. The important element in such approach is the polarization interferometer. In that case, we have the two polarization modes, which propagate with different velocities. These modes are orthogonal and cannot give an interference signal without optical polarizer. After last, an output intensity signal appears and registers by photo receiver. In theoretical part of thesis there presents model of polarization interferometer using method of Jones matrix. In addition, there obtains expressions for output intensity, birefringence, and beat length under different parameters of various typesâ birefringent fibers. Using them it have madden calculations of different characteristics of birefringent fiber type PANDA that very often using in laboratories. The thesis contains theoretical considering of complex and important question about influence of polarization dispersion on birefringence and beat length of polarization modes. It shows that dispersion can significantly degrade parameters of birefringent fibers. Namely, birefringence is decrease, beat length is increase.Â Past part of thesis is devoted to experimental investigation of birefringent optical fibers. Spectral transfer functions measured and beat length and birefringence calculated using them. In the experimental part, we constructed an optical path using the scanning spectral method to conduct measurement experiments. In the experimental optical path, the light passes through polarizer and enters the optical fiber under test, and then passes through another polarizer to enter the polarization sdetector and the signal processed by the computer. Through the photo detector, we can know the intensity of the incident light, and use Fourier transform to obtain its signal image. We compare and fit the results obtained by the computer with the data obtained by the theoretical formula. They are good coincide.
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