Reduction in Temperature-Dependent Fiber-Optic Gyroscope Bias Drift by Using Multifunctional Integrated Optical Chip Fabricated on Pre-Annealed LiNbO3

Reduction in Temperature-Dependent Fiber-Optic Gyroscope Bias Drift by Using Multifunctional Integrated Optical Chip Fabricated on Pre-Annealed LiNbO3

The refractive index change obtained after annealed proton exchange (APE) in lithium niobate (LiNbO3) crystals depends on both the proton exchange process carried out in hot acid and the structure of the crystals. In devices produced by the APE method, dislocations and lattice defects within the cry...

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Bibliographic Details
Published in:Photonics Vol. 11; no. 11; p. 1057
Main Authors: Karagöz, Ercan, Aşık, Fatma Yasemin, Gökkavas, Mutlu, Akbaş, Erkut Emin, Yertutanol, Aylin, Özbay, Ekmel, Özcan, Şadan
Format: Journal Article
Language:English
Published: Basel MDPI AG 11-11-2024
Subjects:
Bias
Closed loop systems
Crystal defects
Crystal dislocations
Crystal lattices
Crystal structure
Crystals
Defect annealing
Drift
Interferometric fiber optic gyroscopes
Lasers
Light
Lithium
Lithium niobates
Military deployment
Optics
Protons
Random walk
Refractivity
Structural stability
Temperature dependence
Waveguides
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Summary:The refractive index change obtained after annealed proton exchange (APE) in lithium niobate (LiNbO3) crystals depends on both the proton exchange process carried out in hot acid and the structure of the crystals. In devices produced by the APE method, dislocations and lattice defects within the crystal structure are considered to be primary contributors to refractive index discontinuities and waveguide instability. In this study, the effects of pre-annealing LiNbO3 crystals at 500 °C on multifunctional integrated optical chips (MIOCs) were investigated through interferometric fiber-optic gyroscope (IFOG) system-level tests. It was observed that the pre-annealing process resulted in an improvement in the optical throughput of MIOCs (from %34 to %51) and the temperature-dependent bias drift stability of the IFOG (from 0.031–0.038°/h to 0.012–0.019°/h). The angle random walk (ARW) was measured as 0.0056 deg/√h.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics11111057