Development and research of narrowband spectral filters on a cascade of fiber Bragg gratings

Yandybaeva, Y.I., Varzhel, S.V., Yakimuk, V.A., Komisarov V.A., Kaliazina, D.V., Dmitriev, A.A., Skovorodkina M.V., Kulikov A.V.

For Russian citation (Opticheskii Zhurnal):

Яндыбаева Ю.И., Варжель С.В., Якимук В.А., Комисаров В.А., Калязина Д.В., Дмитриев А.А., Сковородкина М.В., Куликов А.В. Разработка и исследование узкополосных спектральных фильтров на каскаде волоконных брэгговских решёток // Оптический журнал. 2024. Т. 91. № 10. С. 43–49. http://doi.org/10.17586/1023-5086-2024-91-10-43-49

Yandybaeva Y.I., Varzhel S.V., Yakimuk V.A., Komisarov V.A., Kaliazina D.V., Dmitriev A.A., Skovorodkina M.V., Kulikov A.V. Development and research of narrowband spectral filters on a cascade of fiber Bragg gratings [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 10. P. 43–49. http:// doi.org/10.17586/1023-5086-2024-91-10-43-49

For citation (Journal of Optical Technology):

Abstract:

Subject of study. A cascade of narrowband fiber Bragg gratings with a high attenuation connected to each other through a fiber-optic isolator. Aim of study. Fabrication of a narrowband spectral filter on a cascade of fiber Bragg gratings with a bandwidth of 82 pm. Method. The phase mask method with a scanning beam of KrF excimer laser COHERENT COMPexPro 102F radiation was used for inscribing of long fiber Bragg gratings in order to obtain a narrow bandwidth. Two gratings with the same central wavelength of the Bragg resonance were connected to each other in series through a fiber-optic isolator to avoid interference effects. Main results. According to the transmission spectra of the obtained cascade of fiber Bragg gratings, the filter transmission bandwidth at the level of –3 dB was determined as 82 pm, as well as the maximum attenuation value of 46 dB. The central wavelength of the minimum transmission of the filter was 1549.9 nm. For comparison, the bandwidth of gratings with the same length and similar attenuation value was 123 pm at the level of –3 dB, which significantly exceeds the bandwidth of the filter on the cascade of fiber Bragg gratings. Practical significance. The obtained narrowband filter on a cascade of fiber Bragg gratings is suitable for integration into the subcarrier wave quantum key distribution systems to cut off the carrier wavelength of the signal from the side ones, as well as for other communication line systems where it is necessary to select a narrow spectral band.

Keywords:

fiber Bragg gratings, narrowband spectral filters, cascade of fiber Bragg gratings, fiber-optic isolator, subcarrier wave quantum key distribution system

Acknowledgements:

the work was done by order of JSCo “Russian Railways”

OCIS codes: 060.3735, 060.2340, 060.5565

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