Chinese Journal on Internet of Things ›› 2022, Vol. 6 ›› Issue (4): 65-71.doi: 10.11959/j.issn.2096-3750.2022.00297

• Theory and Technology • Previous Articles     Next Articles

Influence of the optical switch’s extinction ratio on the crosstalk in fiber-optic seismometer array

Fei LIU1, Xian ZHOU1, Min ZHANG2,3   

  1. 1 School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2 Beijing International Center for Gas Hydrate, Peking University, Beijing 100871, China
    3 Dongguan Institute of Opto-electronics, Peking University, Dongguan 523808, China
  • Revised:2022-07-30 Online:2022-12-30 Published:2022-12-01
  • Supported by:
    The National Natural Science Foundation of China(61905004);The Fundamental Research Funds for the Central Universities(FRF-TP-20-067A1Z)

Abstract:

Optical switch is one of the key components in the time-division multiplexing fiber-optic seismometer array and has significant influence on the crosstalk of the array.The source of crosstalk in the array was analyzed based on differential delay heterodyne demodulation scheme.The expression of crosstalk appearing in the seismometer’s output was deduced with the limited extinction ratio.Via simulation, the relationship between the extinction ratio of optical switch and the seismometer’s crosstalk was presented under different array scales, i.e.basically the crosstalk decreases linearly with the increase of optical switch’s extinction ratio, and increases linearly with the increase of the array scale.Finally, an 8-element fiber-optic seismometer array was set up in the experiment, on which different optical switches (acousto-optic modulator and electro-optic modulator) owning distinct extinction ratios could be applied to generate pulse light.Experimental results verified the theoretical analysis as well as the simulation results.

Key words: fiber-optic seismometer array, time-division multiplexing, extinction ratio, crosstalk

CLC Number: 

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