doi: 10.17586/2226-1494-2017-17-6-1004-1010


K. A. Konnov, Y. I. Slozhenikina, A. I. Gribaev, S. V. Varzhel, V. A. Novikova, Y. K. Zalesskaya, A. A. Dmitriev

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For citation: Konnov K.A., Slozhenikina Yu.I., Gribaev A.I., Varzhel S.V., Novikova V.A., Zalesskaya Yu.K., Dmitriev A.A. Inscription process research and optimization for superimposed fiber Bragg gratings. Scientific and Technical Journal of Information Technologies, Mechanics and Optics , 2017, vol. 17, no. 6, pp. 1004–1010 (in Russian). doi: 10.17586/2226-1494-2017-17-6-1004-1010

Subject of Research.The paper presents the study of inscription process distinctive features for superimposed fiber Bragg gratings. We analyzed spectral characteristics changes of superposition segregated gratings that appear during inscription of subsequent diffraction structures over the first ones. Method. Superimposed fiber Bragg gratings inscription was carried out by means of Talbot interferometer. Excimer laser system Optosystems MOPA CL-7550 was used as a radiation source. It was operating on gas mixture KrF (radiation wavelength is equal to 248 nm). The phase mask with a 1000 nm period was implemented in the inscription scheme for laser beam amplitude separation. Fiber Bragg gratings were inscribed in anisotropic optical fiber with 12 mol.% of GeO2 in optical fiber core. Main Results. Samples of superimposed fiber Bragg gratings were obtained and their spectral characteristics were analyzed. We have studied the regularities of the change in the reflection coefficient and the central wavelength of the first grating of the superposition from the number of diffraction structures inscribed over it, the exposure time during the inscription, and the spectral interval between them. Based on the results obtained, recommendations are given for optimizing the superimposed fiber Bragg gratings inscription process. Practical Relevance. The obtained superimposed fiber Bragg gratings can be used in the manufacture of optical filters, sensors for simultaneous measurement of several parameters, as well as for multiplexing and demultiplexing signals in telecommunications.

Keywords: fiber Bragg grating, superposition, phase mask, Talbot interferometer, excimer laser

Acknowledgements. This work has been performed at ITMO University and supported by the Ministry of Education and Science of the Russian Federation (project No.03.G25.31.0245).

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