Fig. 4: Static performances of the four-tube truncated double nested antiresonant nodeless fibre (tDNANF) gyro. | Nature Communications

Fig. 4: Static performances of the four-tube truncated double nested antiresonant nodeless fibre (tDNANF) gyro.

From: Navigation-grade interferometric air-core antiresonant fibre optic gyroscope with enhanced thermal stability

Fig. 4

a Setup of the interferometric fiber optic gyroscope (IFOG). EDF erbium-doped fibre, LD 980 nm laser diode, WDM 980/1550 nm wavelength-division multiplexer, FR 1550 nm filter reflector, GFF gain flattening filter, ISO fibre-optic isolator, PMFC polarization-maintaining fibre coupler, MIOC multifunction integrated-optics chip, PD photodetector. Inset 1: Output spectrum of the amplified spontaneous emission (ASE) source. Inset 2: Photographs of the fibre coil and the MIOC with the two outgoing ports free-space coupled to the fibre coil. Inset 3: Photograph of a fibre end assembled with a microlens. b Static rotation rate readout from the gyro, displaying results over average time windows of 1 s, 100 s, and 1000 s, along with the Allan deviation of the data. BI bias instability, ARW angle random walk. c Measured ARW noise versus detected power for the gyro, compared with theoretically calculated noise of individual sources.

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