Suppression of Nonlinear Residual Intensity Modulation in Multifunction Integrated Optic Circuit for Fiber-Optic Gyroscopes

Liu, Jiaqi; Zhang, Chunxi; Zheng, Yue; Song, Jingming; Gao, Fuyu; Yang, Di

doi:10.1109/jlt.2020.2968478

Cited by 9 publications

(1 citation statement)

References 24 publications

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“…an undesired phase response is introduced partially by inherent effects, such as the residual intensity modulation and the DC drift, which have been studied and basically solved [7]- [12], and partially by external factors such as modulation asymmetry. The MIOC modulation asymmetry indicates the difference in the phase response to the modulation electric fields with the same magnitude but different directions.…”

Section: Introductionmentioning

confidence: 99%

Modulation Asymmetry Suppression of Multifunction Integrated Optic Circuit by Sinking Electrode

Liu

Zhang

et al. 2020

IEEE Access

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The modulation asymmetry of a multifunction integrated optic circuit (MIOC) indicates the difference in the phase response to modulation electric fields with the same magnitude but different directions, and is partly caused by the vertical component of the modulation signal. This introduces a nonlinear phase error that is difficult to compensate in fiber optic gyroscopes (FOGs), which needs to be suppressed. In this paper, a sinking-electrode MIOC design to suppress the modulation asymmetry is proposed and verified through numerical simulations. Optimal parameters of the gap, height, side-wall angle, and center position error of the sinking electrodes are obtained on the basis of the simulation results. With the proposed method, the modulation asymmetry of MIOC can be reduced from 5 × 10 −4 rad to 1 × 10 −6 rad, thus facilitating the development of high-performance FOGs. Furthermore, compared with the traditional electrode design, the sinking-electrode design can increase the tolerance for the manufacturing process, and the design configuration can be obtained through the general process method.INDEX TERMS Multifunction integrated optic circuit (MIOC), phase modulator, modulation asymmetry, electrode design.

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Section: Introductionmentioning

confidence: 99%