INSCRIPTION PROCESS RESEARCH AND OPTIMIZATION FOR SUPERIMPOSED FIBER BRAGG GRATINGS

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.

 1.      Canning J. Fibre gratings and devices for sensors and lasers. Laser and Photonics Review, 2008, vol. 2, no. 4, pp. 275–289. doi: 10.1002/lpor.200810010

2.      Pinto J.L. Fiber Bragg grating sensors novel applications. Latin America Optics and Photonics Conference, 2012, paper LS2C.1. doi: 10.1364/LAOP.2012.LS2C.1

3.      Roriz P., Carvalho L., Frazao O., Santos J.L., Simoes J.A. From conventional sensors to fibre optic sensors for strain and force measurements in biomechanics applications: a review. Journal of Biomechanics, 2014, vol. 47, no. 6, pp. 1251–1261. doi: 10.1016/j.jbiomech.2014.01.054

4.      Okosi T., Okamoto K., Otsu M., Nisihara H., Kuma K., Hatate K. Fiber-Optic Sensors. Leningrad, Energoatomidat Publ., 1991, 256 p. (In Russian)

5.      Yoshino T., Sano Y., Ota D., Fujita K., Ikui T. Fiber-Bragg-grating based single axial mode Fabry-Perot interferometer and its strain and acceleration sensing applications. Journal of Lightwave Technology, 2016, vol. 34, no. 9, pp. 2240–2250. doi: 10.1109/JLT.2016.2521440

6.      Hill K.O., Fujii Y., Johnson D.C., Kawasaki B.S. Photosensitivity in optical fiber waveguides: application to reflection filter fabrication. Applied Physics Letters, 1978, vol. 32, no. 10, pp. 647–649. doi: 10.1063/1.89881

7.      Vasil'ev S.A., Medvedkov O.I., Korolev I.G., Bozhkov A.S., Kurkov A.S., Dianov E.M. Fibre gratings and their applications. Quantum Electronics, 2005, vol. 35, no. 12, pp. 1085–1103. doi: 10.1070/QE2005v035n12ABEH013041

8.      Stam A.M., Idrisov R.F., Gribaev A.I., Varzhel' S.V., Konnov K.A., Slozhenikina Yu.I. Fiber Bragg gratings inscription using Talbot interferometer and KrF excimer laser system. Journal of Instrument Engineering, 2017, vol. 60, no. 5, pp. 466–473. (In Russian) doi: 10.17586/0021-3454-2017-60-5-466-473

9.      Bartelt H., Schuster K., Unger S., Chojetzki C., Rothhardt M., Latka I. Single-pulse fiber Bragg gratings and specific coatings for use at elevated temperatures. Applied Optics, 2007, vol. 46, no. 17, pp. 3417–3424. doi: 10.1364/AO.46.003417

10.   Tokarev A.V., Anchutkin G.G., Varzhel S.V., Gribaev A.I., Kulikov A.V., Meshkovskiy I.K., Rothhardt M., Elsmann T., Becker M., Bartelt H. UV-transparent fluoropolymer fiber coating for the inscription of chirped Bragg gratings arrays. Optics and Laser Technology, 2017, vol. 89, pp. 173–178. doi: 10.1016/j.optlastec.2016.10.012

11.   Arigiris A., Konstantaki M., Ikiades A., Chronis D., Florias P., Kallimani K., Pagiatakis G. Fabrication of high-reflectivity superimposed multiple-fiber Bragg gratings with unequal wavelength spacing. Optics Letters, 2002, vol. 27, no. 15, pp. 1306–1308.

12.   Magne J., Bolger J., Rochette M., LaRochelle S., Chen L.R., Eggleton B.G., Azana J. Generation of a 4×100 GHz pulse-train from a single-wavelength 10-GHz mode-locked laser using superimposed fiber Bragg gratings and nonlinear conversion. Journal of Lightwave Technology, 2006, vol. 24, no. 5, pp. 2091–2099. doi: 10.1109/JLT.2006.872682

13.   Othonos A., Lee X., Measures R.M. Superimposed multiple Bragg gratings. Electronics Letters, 1994, vol. 30, no. 23, pp. 1972–1974. doi: 10.1049/el:19941359

14.   Idrisov R.F., Gribaev A.I., Stam A.M., Varzhel' S.V., Slozhenikina Yu.I., Konnov K.A. Recording superpositions of fiber Bragg gratings using the Talbot interferometer. Opticheskii Zhurnal, 2017, vol. 84, no. 10, pp. 56–60. (In Russian)

15.   Yusuke N., Shinji Y. Realization of various superstructure fiber Bragg gratings for DWDM systems using multiple-phase-shift technique. Proc. Optical Fiber Communication Conference and Exhibit. Anaheim, USA, 2002, vol. 70, pp. 110–111.

16.   Miclos S., Savastru D., Savastru R., Lancranjan I.I. Design of a smart superstructure FBG torsion sensor. Proceedings of SPIE, 2015, vol. 9517, art. 95172B. doi: 10.1117/12.2188231

17.   Zheng Z., Qian Z., Shou G., Hu. Y. Orthogonal wavelength-division-multiplexing using SSFBGs in passive optical networks. Proceedings of SPIE, 2009, vol. 7633, art. 76331O. doi: 10.1117/12.852001

18.   Gribaev A.I., Pavlishin I.V., Stam A.M., Idrisov R.F., Varzhel S.V., Konnov K.A. Laboratory setup for fiber Bragg gratings inscription based on Talbot interferometer. Optical and Quantum Electronics, 2016, vol. 48, no. 12, art. 540.

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