Development, creation and research of a fiber-optic bottom seismic module for marine geophysical research

Kazachkova, I.D., Konnov, K.A., Konnov, D.A., Plotnikov, M.Y., Savin V.V., Volkov, A.V., Kulikov, A.V.

For Russian citation (Opticheskii Zhurnal):

Казачкова И.Д., Коннов К.А., Коннов Д.А., Плотников М.Ю., Савин В.В., Волков А.В., Куликов А.В. Разработка, создание и исследование волоконно-оптического донного сейсмического модуля для морских геофизических исследований // Оптический журнал. 2026. Т. 93. № 11. С. 63–73. http://doi.org/10.17586/1023-5086-2026-93-11-63-73

Kazachkova I.D., Konnov K.A., Konnov D.A., Plotnikov M.Yu., Savin V.V., Vol kov A.V., Kulikov A.V. Development, creation and research of a fiber-optic bottom seismic module for marine geophysical research [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 11. P. 63–73. http://doi.org/10.17586/1023-5086-2026-93-11-63-73

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Interrogation scheme and demodulation algorithm parameters for a fiber-optic ocean-bottom seismic module. Aim of study. Development of a fiber-optic ocean-bottom seismic module based on Michelson interferometers with an extended dynamic range. Method. The sampling frequency was modeled considering pulse propagation delays in interferometer arrays, sensing fiber lengths, and sensor spacing. The upper dynamic range limit of the homodyne demodulation algorithm was evaluated at this frequency. Verification was conducted by comparing vertical component responses of the developed and reference geophones under pulsed shock excitations on a shaker. Main results. A five-sensor multichannel architecture within one module was implemented. A 1 MHz sampling rate ensures a dynamic range of 140 dB (98 rad) at 500 Hz with a 10 µrad/Hz^1/2 noise floor. Geophone calibration coefficients (0.009 rad/(mm/s)) were obtained, confirming high spectral correlation with analogs in the 1–100 Hz band, challenging for other geophone types. Practical significance. The results support development of fiber-optic seismic systems satisfying modern marine geophysics requirements.

Keywords:

fiber-optic sensor, seismic module, Michelson interferometer, homodyne demodulation, dynamic range, seismic exploration, geophone

Acknowledgements:

the research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (project № FSER-2024-0006).

OCIS codes: 060.0060, 230.0230, 250.0250

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